问题：
带有java2d或javafx口吃的选框（ticker,text scroll）
萧鸿轩
我试图写一个平滑的代码（文本从严格到左边运行在屏幕上）。它几乎和我想要的一样，但还是有些口吃。我希望它像天空中移动的云一样平滑。30年前，我只使用了几行汇编代码，但在Java中我失败了。
如果我增加速度（我一次移动文本的像素数），情况会变得更糟。
屏幕刷新是否缺少某种同步？
-
null
当我使用30 fps并且只移动文本一个像素时，在4K显示器上看起来相当不错，但也很慢。当我把速度提高到2像素时，它就开始断断续续了。
我开始认为用java2d根本不可能实现我的目标，我必须转向一些OpenGL-Library。
下面是我的代码：
package scrolling;
import java.awt.AWTException;
import java.awt.BufferCapabilities;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.ImageCapabilities;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.Timer;
import sun.java2d.pipe.hw.ExtendedBufferCapabilities;
/**
* A smooth scroll with green background to be used with a video cutter.
*
* sun.java2d.pipe.hw.ExtendedBufferCapabilities is restricted https://stackoverflow.com/questions/25222811/access-restriction-the-type-application-is-not-api-restriction-on-required-l
*
*/
public class MyScroll extends JFrame implements ActionListener {
private int targetFps = 30;
private boolean isOpenGl = false;
private boolean isVsync = true;
private boolean useGamingLoop = false;
private int speed = 1;
private String message;
private int fontSize = 120;
private Font theFont;
private transient int leftEdge; // Offset from window's right edge to left edge
private Color bgColor;
private Color fgColor;
private int winWidth;
private int winHeight;
private double position = 0.77;
private FontMetrics fontMetrics;
private int yPositionScroll;
private boolean isFullScreen;
private long lastTimerStart = 0;
private BufferedImage img;
private Graphics2D graphicsScroll;
private GraphicsDevice currentScreenDevice = null;
private int msgWidth = 0;
private Timer scrollTimer;
private boolean isRunning;
/* gaming loop variables */
private static final long NANO_IN_MILLI = 1000000L;
// num of iterations with a sleep delay of 0ms before
// game loop yields to other threads.
private static final int NO_DELAYS_PER_YIELD = 16;
// max num of renderings that can be skipped in one game loop,
// game's internal state is updated but not rendered on screen.
private static int MAX_RENDER_SKIPS = 5;
// private long prevStatsTime;
private long gameStartTime;
private long curRenderTime;
private long rendersSkipped = 0L;
private long period; // period between rendering in nanosecs
private long fps;
private long frameCounter;
private long lastFpsTime;
public void init() {
fontSize = getWidth() / 17;
if (getGraphicsConfiguration().getBufferCapabilities().isPageFlipping()) {
try { // no pageflipping available with opengl
BufferCapabilities cap = new BufferCapabilities(new ImageCapabilities(true), new ImageCapabilities(true), BufferCapabilities.FlipContents.BACKGROUND);
// ExtendedBufferCapabilities is supposed to do a vsync
ExtendedBufferCapabilities ebc = new ExtendedBufferCapabilities(cap, ExtendedBufferCapabilities.VSyncType.VSYNC_ON);
createBufferStrategy(2, ebc);
} catch (AWTException e) {
e.printStackTrace();
}
} else {
createBufferStrategy(2);
}
System.out.println(getDeviceConfigurationString(getGraphicsConfiguration()));
message = "This is a test. ";
leftEdge = 0;
theFont = new Font("Helvetica", Font.PLAIN, fontSize);
bgColor = getBackground();
fgColor = getForeground();
winWidth = getSize().width - 1;
winHeight = getSize().height;
yPositionScroll = (int) (winHeight * position);
initScrollImage();
}
/**
* Draw the entire text to a buffered image to copy it to the screen later.
*/
private void initScrollImage() {
Graphics2D og = (Graphics2D) getBufferStrategy().getDrawGraphics();
fontMetrics = og.getFontMetrics(theFont);
Rectangle2D rect = fontMetrics.getStringBounds(message, og);
img = new BufferedImage((int) rect.getWidth(), (int) rect.getHeight(), BufferedImage.TYPE_INT_ARGB);
// At each frame, we get a reference on the rendering buffer graphics2d.
// To handle concurrency, we 'cut' it into graphics context for each cube.
graphicsScroll = img.createGraphics();
graphicsScroll.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphicsScroll.setBackground(Color.BLACK);
graphicsScroll.setFont(theFont);
graphicsScroll.setColor(bgColor);
graphicsScroll.fillRect(0, 0, img.getWidth(), img.getHeight()); // clear offScreen Image.
graphicsScroll.setColor(fgColor);
msgWidth = fontMetrics.stringWidth(message);
graphicsScroll.setColor(Color.white);
graphicsScroll.drawString(message, 1, img.getHeight() - 10);
// for better readability in front of an image draw an outline arround the text
graphicsScroll.setColor(Color.black);
graphicsScroll.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Font font = new Font("Helvetica", Font.PLAIN, fontSize);
graphicsScroll.translate(1, img.getHeight() - 10);
FontRenderContext frc = graphicsScroll.getFontRenderContext();
GlyphVector gv = font.createGlyphVector(frc, message);
graphicsScroll.draw(gv.getOutline());
}
public void start() {
scrollTimer = new Timer(1000 / targetFps, this);
scrollTimer.setRepeats(true);
scrollTimer.setCoalesce(true);
scrollTimer.start();
}
public void startGamingloop() {
// loop initialization
long beforeTime, afterTime, timeDiff, sleepTime;
long overSleepTime = 0L;
int noDelays = 0;
long excess = 0L;
gameStartTime = System.nanoTime();
// prevStatsTime = gameStartTime;
beforeTime = gameStartTime;
period = (1000L * NANO_IN_MILLI) / targetFps; // rendering FPS (nanosecs/targetFPS)
System.out.println("FPS: " + targetFps + ", vsync=");
System.out.println("FPS period: " + period);
// gaming loop http://www.javagaming.org/index.php/topic,19971.0.html
while (true) {
// **2) execute physics
updateLeftEdge();
// **1) execute drawing
drawScroll();
// Synchronise with the display hardware.
// Flip the buffer
if (!getBufferStrategy().contentsLost()) {
getBufferStrategy().show();
}
if (isVsync) {
Toolkit.getDefaultToolkit().sync();
}
afterTime = System.nanoTime();
curRenderTime = afterTime;
calculateFramesPerSecond();
timeDiff = afterTime - beforeTime;
sleepTime = (period - timeDiff) - overSleepTime;
if (sleepTime > 0) { // time left in cycle
// System.out.println("sleepTime: " + (sleepTime/NANO_IN_MILLI));
try {
Thread.sleep(sleepTime / NANO_IN_MILLI);// nano->ms
} catch (InterruptedException ex) {
}
overSleepTime = (System.nanoTime() - afterTime) - sleepTime;
} else { // sleepTime <= 0;
System.out.println("Rendering too slow");
// this cycle took longer than period
excess -= sleepTime;
// store excess time value
overSleepTime = 0L;
if (++noDelays >= NO_DELAYS_PER_YIELD) {
Thread.yield();
// give another thread a chance to run
noDelays = 0;
}
}
beforeTime = System.nanoTime();
/*
* If the rendering is taking too long, then update the game state without rendering it, to get the UPS nearer to the required frame rate.
*/
int skips = 0;
while ((excess > period) && (skips < MAX_RENDER_SKIPS)) {
// update state but don’t render
System.out.println("Skip renderFPS, run updateFPS");
excess -= period;
updateLeftEdge();
skips++;
}
rendersSkipped += skips;
}
}
private void calculateFramesPerSecond() {
if (curRenderTime - lastFpsTime >= NANO_IN_MILLI * 1000) {
fps = frameCounter;
frameCounter = 0;
lastFpsTime = curRenderTime;
}
frameCounter++;
}
public void setRunning(boolean isRunning) {
this.isRunning = isRunning;
}
@Override
public void actionPerformed(ActionEvent e) {
render();
}
private void render() {
if (!isFullScreen) {
repaint(0, yPositionScroll, winWidth, yPositionScroll + fontMetrics.getAscent());
} else {
getBufferStrategy().show();
}
if (isVsync) {
Toolkit.getDefaultToolkit().sync();
}
updateLeftEdge();
drawScroll();
}
/**
* Draws (part) of the prerendered image with text to a position in the screen defined by an increasing
* variable "leftEdge".
*
* @return time drawing took.
*/
private long drawScroll() {
long beforeDrawText = System.nanoTime();
if (winWidth - leftEdge + msgWidth < 0) { // Current scroll entirely off-screen.
leftEdge = 0;
}
int x = winWidth - leftEdge;
int sourceWidth = Math.min(leftEdge, img.getWidth());
Graphics2D og = (Graphics2D) getBufferStrategy().getDrawGraphics();
try { // copy the pre drawn scroll to the screen
og.drawImage(img.getSubimage(0, 0, sourceWidth, img.getHeight()), x, yPositionScroll, null);
} catch (Exception e) {
System.out.println(e.getMessage() + " " + x + " " + sourceWidth);
}
long afterDrawText = System.nanoTime();
return afterDrawText - beforeDrawText;
}
public static void main(String[] args) {
MyScroll scroll = new MyScroll();
System.setProperty("sun.java2d.opengl", String.valueOf(scroll.isOpenGl())); // enable opengl
System.setProperty("sun.java2d.renderer.verbose", "true");
String renderer = "undefined";
try {
renderer = sun.java2d.pipe.RenderingEngine.getInstance().getClass().getName();
System.out.println("Renderer " + renderer);
} catch (Throwable th) {
// may fail with JDK9 jigsaw (jake)
if (false) {
System.err.println("Unable to get RenderingEngine.getInstance()");
th.printStackTrace();
}
}
scroll.setBackground(Color.green);
scroll.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] screens = env.getScreenDevices();
// I want the external monitor attached to my notebook
GraphicsDevice device = screens[screens.length - 1];
boolean isFullScreenSupported = device.isFullScreenSupported();
scroll.setFullScreen(isFullScreenSupported);
scroll.setUndecorated(isFullScreenSupported);
scroll.setResizable(!isFullScreenSupported);
if (isFullScreenSupported) {
device.setFullScreenWindow(scroll);
scroll.setIgnoreRepaint(true);
scroll.validate();
} else {
// Windowed mode
Rectangle r = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds();
scroll.setSize(r.width, r.height);
scroll.pack();
scroll.setExtendedState(JFrame.MAXIMIZED_BOTH);
scroll.setVisible(true);
}
// exit on pressing escape
scroll.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
scroll.setRunning(false);
if(scroll.getScrollTimer() != null) {
scroll.getScrollTimer().stop();
}
System.exit(0);
}
}
});
scroll.setVisible(true);
scroll.init();
if (scroll.isUseGamingLoop()) {
scroll.startGamingloop();
} else {
scroll.start();
}
}
private void updateLeftEdge() {
leftEdge += speed;
}
public Timer getScrollTimer() {
return scrollTimer;
}
public void setFullScreen(boolean isFullScreen) {
this.isFullScreen = isFullScreen;
}
public void setTargetFps(int targetFps) {
this.targetFps = targetFps;
}
public void setOpenGl(boolean isOpenGl) {
this.isOpenGl = isOpenGl;
}
public void setVsync(boolean isVsync) {
this.isVsync = isVsync;
}
public void setUseGamingLoop(boolean useGamingLoop) {
this.useGamingLoop = useGamingLoop;
}
public void setSpeed(int speed) {
this.speed = speed;
}
public void setMessage(String message) {
this.message = message;
}
private String getDeviceConfigurationString(GraphicsConfiguration gc){
return "Bounds: " + gc.getBounds() + "\n" +
"Buffer Capabilities: " + gc.getBufferCapabilities() + "\n" +
" Back Buffer Capabilities: " + gc.getBufferCapabilities().getBackBufferCapabilities() + "\n" +
" Accelerated: " + gc.getBufferCapabilities().getBackBufferCapabilities().isAccelerated() + "\n" +
" True Volatile: " + gc.getBufferCapabilities().getBackBufferCapabilities().isTrueVolatile() + "\n" +
" Flip Contents: " + gc.getBufferCapabilities().getFlipContents() + "\n" +
" Front Buffer Capabilities: " + gc.getBufferCapabilities().getFrontBufferCapabilities() + "\n" +
" Accelerated: " + gc.getBufferCapabilities().getFrontBufferCapabilities().isAccelerated() + "\n" +
" True Volatile: " + gc.getBufferCapabilities().getFrontBufferCapabilities().isTrueVolatile() + "\n" +
" Is Full Screen Required: " + gc.getBufferCapabilities().isFullScreenRequired() + "\n" +
" Is MultiBuffer Available: " + gc.getBufferCapabilities().isMultiBufferAvailable() + "\n" +
" Is Page Flipping: " + gc.getBufferCapabilities().isPageFlipping() + "\n" +
"Device: " + gc.getDevice() + "\n" +
" Available Accelerated Memory: " + gc.getDevice().getAvailableAcceleratedMemory() + "\n" +
" ID String: " + gc.getDevice().getIDstring() + "\n" +
" Type: " + gc.getDevice().getType() + "\n" +
" Display Mode: " + gc.getDevice().getDisplayMode() + "\n" +
"Image Capabilities: " + gc.getImageCapabilities() + "\n" +
" Accelerated: " + gc.getImageCapabilities().isAccelerated() + "\n" +
" True Volatile: " + gc.getImageCapabilities().isTrueVolatile() + "\n";
}
public boolean isOpenGl() {
return isOpenGl;
}
public boolean isUseGamingLoop() {
return useGamingLoop;
}
}
Renderer sun.java2d.pisces.PiscesRenderingEngine
Bounds: java.awt.Rectangle[x=3839,y=0,width=3840,height=2160]
Buffer Capabilities: sun.awt.X11GraphicsConfig$XDBECapabilities@68de145
Back Buffer Capabilities: java.awt.ImageCapabilities@27fa135a
Accelerated: false
True Volatile: false
Flip Contents: undefined
Front Buffer Capabilities: java.awt.ImageCapabilities@27fa135a
Accelerated: false
True Volatile: false
Is Full Screen Required: false
Is MultiBuffer Available: false
Is Page Flipping: true
Device: X11GraphicsDevice[screen=1]
Available Accelerated Memory: -1
ID String: :0.1
Type: 0
Display Mode: java.awt.DisplayMode@1769
Image Capabilities: java.awt.ImageCapabilities@27fa135a
Accelerated: false
True Volatile: false
我运行在英特尔i9 9900K、Nvidia GeForce RTX 2060 Mobile、Ubuntu、OpenJdk 14上。
package scrolling;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import javax.swing.Timer;
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.stage.Screen;
import javafx.stage.Stage;
/**
* A smooth scroll with green background to be used with a video cutter.
*
* https://stackoverflow.com/questions/51478675/error-javafx-runtime-components-are-missing-and-are-required-to-run-this-appli
* https://stackoverflow.com/questions/18547362/javafx-and-openjdk
*
*/
public class MyScroll extends Application {
private boolean useGamingLoop = false;
private int speed = 3;
private String message;
private transient double leftEdge; // Offset from window's right edge to left edge
private Color bgColor;
private Color fgColor;
private double winWidth;
private int winHeight;
private double position = 0.77;
private int yPositionScroll;
private Image img;
private int msgWidth = 0;
private Timer scrollTimer;
private boolean isRunning;
private ImageView imageView;
long lastUpdateTime;
long lastIntervall;
long nextIntervall;
String ADAPTIVE_PULSE_PROP = "com.sun.scenario.animation.adaptivepulse";
int frame = 0;
long timeOfLastFrameSwitch = 0;
@Override
public void start(final Stage stage) {
message = "This is a test. ";
leftEdge = 0;
bgColor = Color.green;
fgColor = Color.white;
winWidth = (int)Screen.getPrimary().getBounds().getWidth();
winHeight = (int)Screen.getPrimary().getBounds().getHeight();
yPositionScroll = (int) (winHeight * position);
initScrollImage(stage);
stage.setFullScreenExitHint("");
stage.setAlwaysOnTop(true);
new AnimationTimer() {
@Override
public void handle(long now) {
nextIntervall = now - lastUpdateTime;
System.out.println(lastIntervall - nextIntervall);
lastUpdateTime = System.nanoTime();
drawScroll(stage);
lastIntervall = nextIntervall;
}
}.start();
//Creating a Group object
Group root = new Group(imageView);
//Creating a scene object
Scene scene = new Scene(root);
//Adding scene to the stage
stage.setScene(scene);
stage.show();
stage.setFullScreen(true);
}
/**
* Draw the entire text to an imageview and add to the scene.
*/
private void initScrollImage(Stage stage) {
int fontSize = (int)winWidth / 17;
Font theFont = new Font("Helvetica", Font.PLAIN, fontSize);
BufferedImage tempImg = new BufferedImage((int)winWidth, winHeight, BufferedImage.TYPE_INT_ARGB);
FontMetrics fontMetrics = tempImg.getGraphics().getFontMetrics(theFont);
Rectangle2D rect = fontMetrics.getStringBounds(message, tempImg.getGraphics());
msgWidth = fontMetrics.stringWidth(message);
BufferedImage bufferedImage = new BufferedImage((int) rect.getWidth(), (int) rect.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D graphicsScroll = bufferedImage.createGraphics();
graphicsScroll.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphicsScroll.setBackground(Color.BLACK);
graphicsScroll.setFont(theFont);
graphicsScroll.setColor(bgColor);
graphicsScroll.fillRect(0, 0, bufferedImage.getWidth(), bufferedImage.getHeight()); // set background color
graphicsScroll.setColor(fgColor);
graphicsScroll.drawString(message, 1, bufferedImage.getHeight() - 10);
// for better readability in front of an image draw an outline arround the text
graphicsScroll.setColor(Color.black);
graphicsScroll.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Font font = new Font("Helvetica", Font.PLAIN, fontSize);
graphicsScroll.translate(1, bufferedImage.getHeight() - 10);
FontRenderContext frc = graphicsScroll.getFontRenderContext();
GlyphVector gv = font.createGlyphVector(frc, message);
graphicsScroll.draw(gv.getOutline());
img = SwingFXUtils.toFXImage(bufferedImage, null);
imageView = new ImageView(img);
imageView.setSmooth(false);
imageView.setCache(true);
//Setting the preserve ratio of the image view
imageView.setPreserveRatio(true);
tempImg.flush();
}
/**
* Draws (part) of the prerendered image with text to a position in the screen defined by an increasing
* variable "leftEdge".
*
* @return time drawing took.
*/
private void drawScroll(Stage stage) {
leftEdge += speed;
if (winWidth - leftEdge + msgWidth < 0) { // Current scroll entirely off-screen.
leftEdge = 0;
}
// imageView.relocate(winWidth - leftEdge, yPositionScroll);
imageView.setX(winWidth - leftEdge);
}
public static void main(String[] args) {
// System.setProperty("sun.java2d.opengl", "true");
System.setProperty("prism.vsync", "true");
// System.setProperty("com.sun.scenario.animation.adaptivepulse", "true");
System.setProperty("com.sun.scenario.animation.vsync", "true");
launch(args);
}
public Timer getScrollTimer() {
return scrollTimer;
}
public void setSpeed(int speed) {
this.speed = speed;
}
public void setMessage(String message) {
this.message = message;
}
public boolean isUseGamingLoop() {
return useGamingLoop;
}
public void setRunning(boolean isRunning) {
this.isRunning = isRunning;
}
}
共有1个答案
韶云瀚
我用Windows10运行这个。我不认为它能在Unix系统上很好地工作。
...
该代码由5个包中的9个类组成。包名在代码中。
package com.ggl.marquee;
import javax.swing.SwingUtilities;
import com.ggl.marquee.model.MarqueeModel;
import com.ggl.marquee.view.MarqueeFrame;
public class Marquee implements Runnable {
@Override
public void run() {
new MarqueeFrame(new MarqueeModel());
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Marquee());
}
}
package com.ggl.marquee.controller;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JTextField;
import com.ggl.marquee.model.MarqueeModel;
import com.ggl.marquee.view.MarqueeFrame;
public class CreateMarqueeActionListener implements ActionListener {
private JTextField field;
private MarqueeFrame frame;
private MarqueeModel model;
public CreateMarqueeActionListener(MarqueeFrame frame, MarqueeModel model,
JTextField field) {
this.frame = frame;
this.model = model;
this.field = field;
}
@Override
public void actionPerformed(ActionEvent event) {
model.stopDtpRunnable();
model.resetPixels();
String s = field.getText().trim();
if (s.equals("")) {
frame.repaintMarqueePanel();
return;
}
s = " " + s + " ";
model.setTextPixels(model.getDefaultFont().getTextPixels(s));
frame.repaintMarqueePanel();
}
}
package com.ggl.marquee.controller;
import javax.swing.DefaultListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import com.ggl.marquee.model.MarqueeFont;
import com.ggl.marquee.model.MarqueeModel;
public class FontSelectionListener implements ListSelectionListener {
private MarqueeModel model;
public FontSelectionListener(MarqueeModel model) {
this.model = model;
}
@Override
public void valueChanged(ListSelectionEvent event) {
DefaultListSelectionModel selectionModel = (DefaultListSelectionModel) event
.getSource();
if (!event.getValueIsAdjusting()) {
int index = selectionModel.getMinSelectionIndex();
if (index >= 0) {
MarqueeFont font = model.getDefaultListModel().get(index);
model.setDefaultFont(font);
}
}
}
}
package com.ggl.marquee.model;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class FontGenerator {
private static final boolean DEBUG = false;
private Font font;
private FontHeights fontHeights;
private Map<Character, MarqueeCharacter> characterMap;
public FontGenerator(Font font) {
this.font = font;
this.characterMap = new HashMap<Character, MarqueeCharacter>();
}
public void execute() {
int width = 50;
BufferedImage bi = generateCharacterImage(width, "B");
int[] result1 = getCharacterHeight(bi);
bi = generateCharacterImage(width, "g");
int[] result2 = getCharacterHeight(bi);
fontHeights = new FontHeights(result1[0], result1[1], result2[1]);
if (DEBUG) System.out.println(fontHeights.getAscender() + ", "
+ fontHeights.getBaseline() + ", "
+ fontHeights.getDescender());
for (int x = 32; x < 127; x++) {
char c = (char) x;
StringBuilder builder = new StringBuilder(3);
builder.append('H');
builder.append(c);
builder.append('H');
bi = generateCharacterImage(width, builder.toString());
int[][] pixels = convertTo2D(bi);
MarqueeCharacter mc = getCharacterPixels(pixels);
if (DEBUG) {
System.out.println(builder.toString() + " " +
mc.getWidth() + "x" + mc.getHeight());
}
characterMap.put(c, mc);
}
}
private BufferedImage generateCharacterImage(int width, String string) {
BufferedImage bi = new BufferedImage(
width, width, BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
g.setFont(font);
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, width);
g.setColor(Color.BLACK);
g.drawString(string, 0, width / 2);
return bi;
}
private int[] getCharacterHeight(BufferedImage bi) {
int[][] pixels = convertTo2D(bi);
int minHeight = bi.getHeight();
int maxHeight = 0;
for (int i = 0; i < pixels.length; i++) {
for (int j = 0; j < pixels[i].length; j++) {
if (pixels[i][j] < -1) {
minHeight = Math.min(i, minHeight);
maxHeight = Math.max(i, maxHeight);
}
}
}
int[] result = new int[2];
result[0] = minHeight;
result[1] = maxHeight;
return result;
}
private MarqueeCharacter getCharacterPixels(int[][] pixels) {
List<Boolean[]> list = new ArrayList<Boolean[]>();
int startRow = fontHeights.getAscender();
int endRow = fontHeights.getDescender();
int height = fontHeights.getCharacterHeight();
int startColumn = getCharacterColumnStart(pixels);
int endColumn = getCharacterColumnEnd(pixels);
for (int i = startColumn; i <= endColumn; i++) {
Boolean[] characterColumn = new Boolean[height];
int k = 0;
for (int j = startRow; j <= endRow; j++) {
if (pixels[j][i] < -1) characterColumn[k] = true;
else characterColumn[k] = false;
k++;
}
list.add(characterColumn);
}
MarqueeCharacter mc = new MarqueeCharacter(list.size(), height);
for (int i = 0; i < list.size(); i++) {
Boolean[] characterColumn = list.get(i);
mc.setColumn(characterColumn);
}
return mc;
}
private int getCharacterColumnStart(int[][] pixels) {
int start = fontHeights.getAscender();
int end = fontHeights.getBaseline();
int letterEndFlag = 0;
int column = 1;
while (letterEndFlag < 1) {
boolean pixelDetected = false;
for (int i = start; i <= end; i++) {
if (pixels[i][column] < -1) {
pixelDetected = true;
}
}
column++;
// End of first letter
if ((letterEndFlag == 0) && !pixelDetected) letterEndFlag = 1;
}
return column;
}
private int getCharacterColumnEnd(int[][] pixels) {
int start = fontHeights.getAscender();
int end = fontHeights.getBaseline();
int height = fontHeights.getCharacterHeight2();
int letterEndFlag = 0;
int column = pixels.length - 1;
while (letterEndFlag < 4) {
int pixelCount = 0;
for (int i = start; i <= end; i++) {
if (pixels[i][column] < -1) {
pixelCount++;
}
}
column--;
// End of first letter
if (pixelCount >= height) letterEndFlag++;
// Start of first letter
// if ((letterEndFlag == 0) && (pixelCount > 0)) letterEndFlag = 1;
}
return column;
}
private int[][] convertTo2D(BufferedImage image) {
final int[] pixels = ((DataBufferInt) image.getRaster().getDataBuffer())
.getData();
final int width = image.getWidth();
final int height = image.getHeight();
int[][] result = new int[height][width];
for (int pixel = 0, row = 0, col = 0; pixel < pixels.length; pixel++) {
result[row][col] = pixels[pixel];
col++;
if (col == width) {
col = 0;
row++;
}
}
return result;
}
public MarqueeCharacter getCharacter(Character c) {
MarqueeCharacter mc = characterMap.get(c);
return (mc == null) ? characterMap.get('?') : mc;
}
public int getCharacterHeight() {
return fontHeights.getCharacterHeight();
}
}
package com.ggl.marquee.model;
public class FontHeights {
private final int ascender;
private final int baseline;
private final int descender;
public FontHeights(int ascender, int baseline, int descender) {
this.ascender = ascender;
this.baseline = baseline;
this.descender = descender;
}
public int getCharacterHeight() {
return descender - ascender + 1;
}
public int getCharacterHeight2() {
return baseline - ascender + 1;
}
public int getAscender() {
return ascender;
}
public int getBaseline() {
return baseline;
}
public int getDescender() {
return descender;
}
}
package com.ggl.marquee.model;
import java.security.InvalidParameterException;
public class MarqueeCharacter {
private static int columnCount;
private int height;
private int width;
private boolean[][] pixels;
public MarqueeCharacter(int width, int height) {
this.width = width;
this.height = height;
this.pixels = new boolean[width][height];
columnCount = 0;
}
public void setColumn(Boolean[] value) {
int height = value.length;
if (this.height != height) {
String s = "The number of values must equal the column height - "
+ this.height;
throw new InvalidParameterException(s);
}
for (int i = 0; i < height; i++) {
pixels[columnCount][i] = value[i];
}
columnCount++;
}
public boolean[][] getPixels() {
return pixels;
}
public boolean isComplete() {
return (width == columnCount);
}
public int getHeight() {
return height;
}
public int getWidth() {
return width;
}
}
MarqueeFont类
package com.ggl.marquee.model;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
public class MarqueeFont {
private static final boolean DEBUG = false;
private int fontHeight;
private Font font;
public MarqueeFont(Font font) {
this.font = font;
FontRenderContext frc = new FontRenderContext(null, true, true);
Rectangle2D r2D = font.getStringBounds("HgH", frc);
this.fontHeight = (int) Math.round(r2D.getHeight());
if (DEBUG) {
System.out.println(font.getFamily() + " " + fontHeight + " pixels");
}
}
public boolean[][] getTextPixels(String s) {
FontRenderContext frc = new FontRenderContext(null, true, true);
Rectangle2D r2D = font.getStringBounds(s, frc);
int rWidth = (int) Math.round(r2D.getWidth());
int rHeight = (int) Math.round(r2D.getHeight());
int rX = (int) Math.round(r2D.getX());
int rY = (int) Math.round(r2D.getY());
if (DEBUG) {
System.out.print(s);
System.out.print(", rWidth = " + rWidth);
System.out.print(", rHeight = " + rHeight);
System.out.println(", rX = " + rX + ", rY = " + rY);
}
BufferedImage bi = generateCharacterImage(rX, -rY, rWidth, rHeight, s);
int[][] pixels = convertTo2D(bi);
if (DEBUG) {
displayPixels(pixels);
}
return createTextPixels(pixels);
}
private BufferedImage generateCharacterImage(int x, int y, int width,
int height, String string) {
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
g.setFont(font);
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
g.setColor(Color.BLACK);
g.drawString(string, x, y);
return bi;
}
private int[][] convertTo2D(BufferedImage image) {
final int[] pixels = ((DataBufferInt) image.getRaster().getDataBuffer())
.getData();
final int width = image.getWidth();
final int height = image.getHeight();
int[][] result = new int[height][width];
int row = 0;
int col = 0;
for (int pixel = 0; pixel < pixels.length; pixel++) {
result[row][col] = pixels[pixel];
col++;
if (col == width) {
col = 0;
row++;
}
}
return result;
}
private void displayPixels(int[][] pixels) {
for (int i = 0; i < pixels.length; i++) {
String s = String.format("%03d", (i + 1));
System.out.print(s + ". ");
for (int j = 0; j < pixels[i].length; j++) {
if (pixels[i][j] == -1) {
System.out.print(" ");
} else {
System.out.print("X ");
}
}
System.out.println("");
}
}
private boolean[][] createTextPixels(int[][] pixels) {
// The int array pixels is in column, row order.
// We have to flip the array and produce the output
// in row, column order.
if (DEBUG) {
System.out.println(pixels[0].length + "x" + pixels.length);
}
boolean[][] textPixels = new boolean[pixels[0].length][pixels.length];
for (int i = 0; i < pixels.length; i++) {
for (int j = 0; j < pixels[i].length; j++) {
if (pixels[i][j] == -1) {
textPixels[j][i] = false;
} else {
textPixels[j][i] = true;
}
}
}
return textPixels;
}
public Font getFont() {
return font;
}
public int getFontHeight() {
return fontHeight;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append(font.getFamily());
builder.append(", ");
builder.append(getStyleText());
builder.append(", ");
builder.append(font.getSize());
builder.append(" pixels");
return builder.toString();
}
private StringBuilder getStyleText() {
StringBuilder builder = new StringBuilder();
int style = font.getStyle();
if (style == Font.PLAIN) {
builder.append("normal");
} else if (style == Font.BOLD) {
builder.append("bold");
} else if (style == Font.ITALIC) {
builder.append("italic");
} else if (style == (Font.BOLD + Font.ITALIC)) {
builder.append("bold italic");
} else {
builder.append("unknown style");
}
return builder;
}
}
MarqueeFontFactory类
package com.ggl.marquee.model;
import java.awt.Font;
import javax.swing.DefaultListModel;
public class MarqueeFontFactory {
private DefaultListModel<MarqueeFont> fontList;
private MarqueeFont defaultFont;
public MarqueeFontFactory() {
this.fontList = new DefaultListModel<MarqueeFont>();
addElements();
}
private void addElements() {
this.defaultFont = new MarqueeFont(new Font("Arial", Font.BOLD, 16));
fontList.addElement(defaultFont);
fontList.addElement(new MarqueeFont(new Font("Cambria", Font.BOLD, 16)));
fontList.addElement(new MarqueeFont(new Font("Courier New", Font.BOLD,
16)));
fontList.addElement(new MarqueeFont(new Font("Georgia", Font.BOLD, 16)));
fontList.addElement(new MarqueeFont(new Font("Lucida Calligraphy",
Font.BOLD, 16)));
fontList.addElement(new MarqueeFont(new Font("Times New Roman",
Font.BOLD, 16)));
fontList.addElement(new MarqueeFont(new Font("Verdana", Font.BOLD, 16)));
}
public DefaultListModel<MarqueeFont> getFontList() {
return fontList;
}
public void setDefaultFont(MarqueeFont defaultFont) {
this.defaultFont = defaultFont;
}
public MarqueeFont getDefaultFont() {
return defaultFont;
}
public int getCharacterHeight() {
int maxHeight = 0;
for (int i = 0; i < fontList.getSize(); i++) {
MarqueeFont font = fontList.get(i);
int height = font.getFontHeight();
maxHeight = Math.max(height, maxHeight);
}
return maxHeight;
}
}
MarqueeModel类
package com.ggl.marquee.model;
import javax.swing.DefaultListModel;
import com.ggl.marquee.runnable.DisplayTextPixelsRunnable;
import com.ggl.marquee.view.MarqueeFrame;
public class MarqueeModel {
private static final int marqueeWidth = 120;
private boolean[][] marqueePixels;
private boolean[][] textPixels;
private DisplayTextPixelsRunnable dtpRunnable;
private MarqueeFontFactory fonts;
private MarqueeFrame frame;
public MarqueeModel() {
this.fonts = new MarqueeFontFactory();
this.marqueePixels = new boolean[marqueeWidth][getMarqueeHeight()];
}
public void setFrame(MarqueeFrame frame) {
this.frame = frame;
}
public MarqueeFontFactory getFonts() {
return fonts;
}
public DefaultListModel<MarqueeFont> getDefaultListModel() {
return fonts.getFontList();
}
public MarqueeFont getDefaultFont() {
return fonts.getDefaultFont();
}
public void setDefaultFont(MarqueeFont defaultFont) {
fonts.setDefaultFont(defaultFont);
}
public boolean[][] getMarqueePixels() {
return marqueePixels;
}
public boolean getMarqueePixel(int width, int height) {
return marqueePixels[width][height];
}
public int getMarqueeWidth() {
return marqueeWidth;
}
public int getMarqueeHeight() {
return fonts.getCharacterHeight();
}
public boolean[][] getTextPixels() {
return textPixels;
}
public int getTextPixelWidth() {
return textPixels.length;
}
private void startDtpRunnable() {
dtpRunnable = new DisplayTextPixelsRunnable(frame, this);
new Thread(dtpRunnable).start();
}
public void stopDtpRunnable() {
if (dtpRunnable != null) {
dtpRunnable.stopDisplayTextPixelsRunnable();
dtpRunnable = null;
}
}
public void setTextPixels(boolean[][] textPixels) {
this.textPixels = textPixels;
if (textPixels.length < getMarqueeWidth()) {
this.marqueePixels = copyCharacterPixels(0, textPixels,
marqueePixels);
} else {
startDtpRunnable();
}
}
public void resetPixels() {
for (int i = 0; i < getMarqueeWidth(); i++) {
for (int j = 0; j < getMarqueeHeight(); j++) {
marqueePixels[i][j] = false;
}
}
}
public void setAllPixels() {
for (int i = 0; i < getMarqueeWidth(); i++) {
for (int j = 0; j < getMarqueeHeight(); j++) {
marqueePixels[i][j] = true;
}
}
}
public boolean[][] copyCharacterPixels(int position,
boolean[][] characterPixels, boolean[][] textPixels) {
for (int i = 0; i < characterPixels.length; i++) {
for (int j = 0; j < characterPixels[i].length; j++) {
textPixels[i + position][j] = characterPixels[i][j];
}
}
return textPixels;
}
public void copyTextPixels(int position) {
for (int i = 0; i < marqueePixels.length; i++) {
int k = i + position;
k %= textPixels.length;
for (int j = 0; j < textPixels[i].length; j++) {
marqueePixels[i][j] = textPixels[k][j];
}
}
}
}
package com.ggl.marquee.runnable;
import javax.swing.SwingUtilities;
import com.ggl.marquee.model.MarqueeModel;
import com.ggl.marquee.view.MarqueeFrame;
public class DisplayAllPixelsRunnable implements Runnable {
private MarqueeFrame frame;
private MarqueeModel model;
public DisplayAllPixelsRunnable(MarqueeFrame frame, MarqueeModel model) {
this.frame = frame;
this.model = model;
}
@Override
public void run() {
model.setAllPixels();
repaint();
try {
Thread.sleep(3000L);
} catch (InterruptedException e) {
}
model.resetPixels();
repaint();
}
private void repaint() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
frame.repaintMarqueePanel();
}
});
}
}
package com.ggl.marquee.runnable;
import javax.swing.SwingUtilities;
import com.ggl.marquee.model.MarqueeModel;
import com.ggl.marquee.view.MarqueeFrame;
public class DisplayTextPixelsRunnable implements Runnable {
private static int textPixelPosition;
private volatile boolean running;
private MarqueeFrame frame;
private MarqueeModel model;
public DisplayTextPixelsRunnable(MarqueeFrame frame, MarqueeModel model) {
this.frame = frame;
this.model = model;
textPixelPosition = 0;
}
@Override
public void run() {
this.running = true;
while (running) {
model.copyTextPixels(textPixelPosition);
repaint();
sleep();
textPixelPosition++;
textPixelPosition %= model.getTextPixelWidth();
}
}
private void repaint() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
frame.repaintMarqueePanel();
}
});
}
private void sleep() {
try {
Thread.sleep(50L);
} catch (InterruptedException e) {
}
}
public synchronized void stopDisplayTextPixelsRunnable() {
this.running = false;
}
}
package com.ggl.marquee.view;
import java.awt.BorderLayout;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import com.ggl.marquee.controller.CreateMarqueeActionListener;
import com.ggl.marquee.controller.FontSelectionListener;
import com.ggl.marquee.model.MarqueeFont;
import com.ggl.marquee.model.MarqueeModel;
public class ControlPanel {
private JButton submitButton;
private JPanel panel;
private MarqueeFrame frame;
private MarqueeModel model;
public ControlPanel(MarqueeFrame frame, MarqueeModel model) {
this.frame = frame;
this.model = model;
createPartControl();
}
private void createPartControl() {
panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
JPanel fontPanel = new JPanel();
fontPanel.setLayout(new BorderLayout());
JLabel fontLabel = new JLabel("Fonts");
fontPanel.add(fontLabel, BorderLayout.NORTH);
JList<MarqueeFont> fontList = new JList<MarqueeFont>(
model.getDefaultListModel());
fontList.setSelectedValue(model.getDefaultFont(), true);
fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
fontList.setVisibleRowCount(3);
ListSelectionModel listSelectionModel = fontList.getSelectionModel();
listSelectionModel.addListSelectionListener(new FontSelectionListener(
model));
JScrollPane fontScrollPane = new JScrollPane(fontList);
fontPanel.add(fontScrollPane, BorderLayout.CENTER);
panel.add(fontPanel);
JPanel fieldPanel = new JPanel();
JLabel fieldLabel = new JLabel("Marquee Text: ");
fieldPanel.add(fieldLabel);
JTextField field = new JTextField(30);
fieldPanel.add(field);
panel.add(fieldPanel);
JPanel buttonPanel = new JPanel();
submitButton = new JButton("Submit");
submitButton.addActionListener(new CreateMarqueeActionListener(frame,
model, field));
buttonPanel.add(submitButton);
panel.add(buttonPanel);
}
public JPanel getPanel() {
return panel;
}
public JButton getSubmitButton() {
return submitButton;
}
}
package com.ggl.marquee.view;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import com.ggl.marquee.model.MarqueeModel;
import com.ggl.marquee.runnable.DisplayAllPixelsRunnable;
public class MarqueeFrame {
private ControlPanel controlPanel;
private DisplayAllPixelsRunnable dapRunnable;
private JFrame frame;
private MarqueeModel model;
private MarqueePanel marqueePanel;
public MarqueeFrame(MarqueeModel model) {
this.model = model;
model.setFrame(this);
createPartControl();
}
private void createPartControl() {
frame = new JFrame();
// frame.setIconImage(getFrameImage());
frame.setTitle("Marquee");
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent event) {
exitProcedure();
}
});
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.PAGE_AXIS));
marqueePanel = new MarqueePanel(model);
mainPanel.add(marqueePanel);
controlPanel = new ControlPanel(this, model);
mainPanel.add(controlPanel.getPanel());
frame.add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.getRootPane().setDefaultButton(controlPanel.getSubmitButton());
frame.setVisible(true);
dapRunnable = new DisplayAllPixelsRunnable(this, model);
new Thread(dapRunnable).start();
}
private void exitProcedure() {
frame.dispose();
System.exit(0);
}
public void repaintMarqueePanel() {
marqueePanel.repaint();
}
}
package com.ggl.marquee.view;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JPanel;
import com.ggl.marquee.model.MarqueeModel;
public class MarqueePanel extends JPanel {
private static final long serialVersionUID = -1677343084333836763L;
private static final int pixelWidth = 4;
private static final int gapWidth = 2;
private static final int totalWidth = pixelWidth + gapWidth;
private static final int yStart = gapWidth + totalWidth + totalWidth;
private MarqueeModel model;
public MarqueePanel(MarqueeModel model) {
this.model = model;
int width = model.getMarqueeWidth() * totalWidth + gapWidth;
int height = model.getMarqueeHeight() * totalWidth + yStart + yStart;
setPreferredSize(new Dimension(width, height));
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0, 0, getWidth(), getHeight());
int x = gapWidth;
int y = yStart;
for (int i = 0; i < model.getMarqueeWidth(); i++) {
for (int j = 0; j < model.getMarqueeHeight(); j++) {
if (model.getMarqueePixel(i, j)) {
g.setColor(Color.PINK);
} else {
g.setColor(Color.BLACK);
}
g.fillRect(x, y, pixelWidth, pixelWidth);
y += totalWidth;
}
y = yStart;
x += totalWidth;
}
}
}
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