本研究基于以下环节。geomerative库文档可以从以下链接中看到。
//build a bezier curve using the recursive polynomial form
//number of control points(num+1 points)
int num = 4;
//arraylist to store the picked values
ArrayList<Point> pt;
float nfac;
import geomerative.*;
RFont fnt;
RGroup rg;
RPoint [][]rp;
String str = "(O_o)/ Oooh";
FloatList X;
FloatList Y;
FloatList SUM;
void setup(){
size(1000,1000,P2D);
RG.init(this);
pt = new ArrayList<Point>();
//pick a number of points with random positions and store x,y values in them
for(int i=0; i<=num; i++){
float x = random(0,width);
float y = random(0,height);
pt.add(new Point(x,y));
}
fnt = new RFont("Zapfino.ttf",100);
//RCommand.setSegmentAngle(random(0,HALF_PI));
//RCommand.setSegmentator(RCommand.ADAPTATIVE);
RCommand.setSegmentLength(3);
RCommand.setSegmentator(RCommand.UNIFORMLENGTH);
rg = fnt.toGroup(str);
rp = rg.getPointsInPaths();
X = new FloatList();
Y = new FloatList();
SUM = new FloatList();
}
void draw(){
background(255);
noFill();
strokeCap(ROUND);
strokeWeight(2);
//draw points
beginShape();
for(int i=0; i<=num; i++){
vertex(pt.get(i).x,pt.get(i).y);
}
endShape();
for(int i=0; i<=num; i++){
ellipse(pt.get(i).x,pt.get(i).y,10,10);
}
//draw curve
nfac = 1;
for(int i=0; i<num; i++){
nfac *= (i+1);
}
strokeWeight(2);
beginShape();
int Bzindex = 0;
for(float t=0; t<=1; t+=0.01){
float x = 0;
float y = 0;
Bzindex++;
for(int i=0; i<=num; i++){
float coef = 1;
float kfac = 1;
float k_nfac = 1;
for(int k=i; k>0; k--){
kfac *= k;
}
for(int k=(num-i); k>0; k--){
k_nfac *= k;
}
coef = nfac/(kfac*k_nfac);
x += coef*(pow((1-t),num-i)*pow(t,i)*pt.get(i).x);
y += coef*(pow((1-t),num-i)*pow(t,i)*pt.get(i).y);
}
vertex(x,y);
X.set(Bzindex,x);
Y.set(Bzindex,y);
}
endShape();
//get arclength by pulling points from a floatlist
int numberOfDivisions = X.size()-2;
int maxPoint = numberOfDivisions+1;
float sum = 0;
float prevPointX = X.get(0);
float prevPointY = Y.get(0);
for(int i=1; i<=maxPoint; i++){
float pointX = X.get(i);
float pointY = Y.get(i);
sum += dist(pointX,pointY,prevPointX,prevPointY);
SUM.set(i-1,sum);
prevPointX = pointX;
prevPointY = pointY;
}
//
//*******************************************************
noFill();
//creates error only when using fill();
fill(0,255,0);
stroke(0);
//noStroke();
strokeWeight(4);
float indent = SUM.get(0);
beginShape();
for(int i=0; i<rp.length; i++){
if(i>0){
beginContour();
}
for(int j=0; j<rp[i].length; j++){
float t = 0;
indent = rp[i][j].x+SUM.get(0);
//
float targetArcLength = indent;
int index = IndexOfLargestValueSmallerThan(targetArcLength);
if(SUM.get(index)==targetArcLength){
t = index/(SUM.size()-1);
}else{
float lengthBefore = SUM.get(index);
float lengthAfter = SUM.get(index+1);
float segmentLength = lengthAfter - lengthBefore;
float segmentFraction = (targetArcLength - lengthBefore)/segmentLength;
t = (index+segmentFraction)/(SUM.size()-1);
}
float x = 0;
float y = 0;
float vx = 0;
float vy = 0;
for(int l=0; l<=num; l++){
float coef = 1;
float kfac = 1;
float k_nfac = 1;
for(int k=l; k>0; k--){
kfac *= k;
}
for(int k=(num-l); k>0; k--){
k_nfac *= k;
}
coef = nfac/(kfac*k_nfac);
x += coef*(pow((1-t),num-l)*pow(t,l)*pt.get(l).x);
y += coef*(pow((1-t),num-l)*pow(t,l)*pt.get(l).y);
float v = (pow(1-t,num-l)*l*pow(t,l-1))+((num-l)*pow(1-t,num-l-1)*(-1)*pow(t,l));
vx += coef*pt.get(l).x*(v);
vy += coef*pt.get(l).y*(v);
}
PVector P = new PVector(x,rp[i][j].y+y);
PVector ldir = new PVector(P.x-x,P.y-y);
PVector dir = new PVector(vy,-vx);
//
ldir.rotate(dir.heading()+PI/2);
vertex(x+ldir.x,y+ldir.y);
}
if(i<rp.length&&i>0){
endContour();
}
}
endShape();
//**************************************************************
}
int IndexOfLargestValueSmallerThan(float _targetArcLength){
int index = 0;
for(int i=0; i<SUM.size()-1; i++){
if(SUM.get(i)<=_targetArcLength){
index = i;
}
}
return index;
}
void mouseDragged(){
int which = -1;
if((mouseX<width)&&(mouseX>0)&&(mouseY<height)&&(mouseY>0)){
for(int i=0; i<=num; i++){
if(dist(mouseX,mouseY,pt.get(i).x,pt.get(i).y)<50){
which = i;
pt.get(which).update(mouseX,mouseY);
}
}
}
}
class Point{
float x,y;
Point(float _x, float _y){
x = _x;
y = _y;
}
void update(float _newx, float _newy){
x = _newx;
y = _newy;
}
}
有时错误发生在加载草图时。大多数情况下,它加载正常,但当你稍微拖动点时,它会抛出一个错误。错误代码有时是指曲线的控制点被鼠标位置更新的点,但是因为错误经常发生在草图加载的时候,我认为这不是一个与更新的位置有关的问题。
错误代码如下;
a.lang.AssertionError
at processing.opengl.PSurfaceJOGL$2.run(PSurfaceJOGL.java:412)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.AssertionError
at jogamp.opengl.glu.tessellator.Sweep.AddRightEdges(Sweep.java:358)
at jogamp.opengl.glu.tessellator.Sweep.SweepEvent(Sweep.java:1105)
at jogamp.opengl.glu.tessellator.Sweep.__gl_computeInterior(Sweep.java:1339)
at jogamp.opengl.glu.tessellator.GLUtessellatorImpl.gluTessEndPolygon(GLUtessellatorImpl.java:526)
at com.jogamp.opengl.glu.GLU.gluTessEndPolygon(GLU.java:896)
at processing.opengl.PJOGL$Tessellator.endPolygon(PJOGL.java:641)
at processing.opengl.PGraphicsOpenGL$Tessellator.tessellatePolygon(PGraphicsOpenGL.java:12621)
at processing.opengl.PGraphicsOpenGL.tessellate(PGraphicsOpenGL.java:2255)
at processing.opengl.PGraphicsOpenGL.endShape(PGraphicsOpenGL.java:1965)
at processing.core.PGraphics.endShape(PGraphics.java:1707)
at processing.core.PApplet.endShape(PApplet.java:11641)
at bezier_polynomial_recursive_text_03.draw(bezier_polynomial_recursive_text_03.java:218)
at processing.core.PApplet.handleDraw(PApplet.java:2475)
at processing.opengl.PSurfaceJOGL$DrawListener.display(PSurfaceJOGL.java:866)
at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:692)
at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:674)
RuntimeException: java.lang.AssertionError
at jogamp.opengl.GLAutoDrawableBase$2.run(GLAutoDrawableBase.java:443)
at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1293)
at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1147)
at com.jogamp.newt.opengl.GLWindow.display(GLWindow.java:759)
at com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:81)
at com.jogamp.opengl.util.AnimatorBase.display(AnimatorBase.java:452)
at com.jogamp.opengl.util.FPSAnimator$MainTask.run(FPSAnimator.java:178)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
我不认为这会直接回答我的问题,但它确实阻止了在使用fill()和P2D渲染器时出现的错误。正如laancelot在上面指出的,主要问题似乎确实与堆栈溢出有关。所以我用下面写的两种方法来处理这个问题;结论:直接原因是数学公式表达不好。
1)在类中切换RPoints。-我不认为这是发生错误的直接原因,因为在只完成重写代码这一部分的阶段,错误仍然存在。但也许这是问题的一部分。我不确定。
2)重写代码表达公式的部分,求取特定点的bezier曲线。--以前,该公式是利用n次bezier曲线的显式定义得出的。因此,公式必须为RPoint点中的每个点计算(更像made)。正如维基百科关于贝塞尔曲线的页面上提到的,这种计算方式是不推荐的。-在修订后的代码中,用于扭曲文本的公式以多项式形式表示。因此,它能够在RPoint点迭代之前预先计算多项式的系数。这似乎解决了问题。
//n number of points
int num = 4;
//arraylist to store the picked values
ArrayList<cntrlPoint> pt;
//import the geomerative library
import geomerative.*;
//string
String str = "(O_o)/ Oooh";
FloatList X;
FloatList Y;
FloatList SUM;
RClass rc;
void setup() {
size(1000, 1000, P2D);
pt = new ArrayList<cntrlPoint>();
//pick a number of points with random positions
for (int i=0; i<=num; i++) {
float x = random(0, width);
float y = random(0, height);
pt.add(new cntrlPoint(x, y));
}
RG.init(this);
rc = new RClass();
X = new FloatList();
Y = new FloatList();
SUM = new FloatList();
}
void draw() {
background(255);
noFill();
strokeWeight(2);
drwCntrlPoints();
drwCurve();
gtArcLength();
fill(0,255,0);
rc.crtPoly(pt);
rc.drwText();
}
void drwCntrlPoints() {
//draw points
beginShape();
for (int i=0; i<=num; i++) {
vertex(pt.get(i).x, pt.get(i).y);
}
endShape();
for (int i=0; i<=num; i++) {
ellipse(pt.get(i).x, pt.get(i).y, 10, 10);
}
}
void drwCurve() {
//draw curve
float curveDetail = 0.01;
float nfac = 1;
for (int i=0; i<num; i++) {
nfac *= (i+1);
}
int arcIndex = 0;
strokeWeight(2);
beginShape();
for (float t=0; t<=1; t+=curveDetail) {
float x = 0;
float y = 0;
arcIndex++;
for (int i=0; i<=num; i++) {
float coef = 1;
float kfac = 1;
float k_nfac = 1;
for (int k=i; k>0; k--) {
kfac *= k;
}
for (int k=(num-i); k>0; k--) {
k_nfac *= k;
}
coef = nfac/(kfac*k_nfac);
x += coef*(pow((1-t), num-i)*pow(t, i)*pt.get(i).x);
y += coef*(pow((1-t), num-i)*pow(t, i)*pt.get(i).y);
}
vertex(x, y);
X.set(arcIndex, x);
Y.set(arcIndex, y);
}
endShape();
}
void gtArcLength() {
//get arclength by pulling points from a floatlist
int numberOfDivisions = X.size()-2;
int maxPoint = numberOfDivisions+1;
float sum = 0;
float prevPointX = X.get(0);
float prevPointY = Y.get(0);
for (int i=1; i<=maxPoint; i++) {
float pointX = X.get(i);
float pointY = Y.get(i);
sum += dist(pointX, pointY, prevPointX, prevPointY);
SUM.set(i-1, sum);
prevPointX = pointX;
prevPointY = pointY;
}
}
//*******factorial
int fact(int fa){
if(fa==1){
return 1;
}
if(fa==0){
return 1;
}
else{
return fa*fact(fa-1);
}
}
//********************
int IndexOfLargestValueSmallerThan(float _targetArcLength) {
int index = 0;
for (int i=0; i<SUM.size()-1; i++) {
if (SUM.get(i)<=_targetArcLength) {
index = i;
}
}
return index;
}
void mouseDragged() {
int which = -1;
if ((mouseX<width)&&(mouseX>0)&&(mouseY<height)&&(mouseY>0)) {
for (int i=0; i<=num; i++) {
if (dist(mouseX, mouseY, pt.get(i).x, pt.get(i).y)<80) {
which = i;
}
}
if (which>-1) {
pt.get(which).update(mouseX, mouseY);
}
}
}
class RClass {
//get ttf file
//create rfont
RFont fnt;
//turn rfont to rgroup to get points
RGroup rg;
//going to get point in path, so that the characters in the string can be seperated
RPoint [][]rp;
//floatlist to store coefficients
FloatList Cx;
FloatList Cy;
RClass() {
fnt = new RFont("Zapfino.ttf", 100);
rg = fnt.toGroup(str);
rp = rg.getPointsInPaths();
//RCommand.setSegmentAngle(random(0,HALF_PI));
//RCommand.setSegmentator(RCommand.ADAPTATIVE);
RCommand.setSegmentLength(3);
RCommand.setSegmentator(RCommand.UNIFORMLENGTH);
Cx = new FloatList();
Cy = new FloatList();
}
//**********************************here
void crtPoly(ArrayList<cntrlPoint> _pt){
float ptsize = _pt.size();
for(int j=0; j<ptsize; j++){
float coefx = 0;
float coefy = 0;
float pi = 1;
float sigx = 0;
float sigy = 0;
for(int m=0; m<=j-1; m++){
pi *= (ptsize-1-m);
}
for(int i=0; i<=j; i++){
sigx += (pow(-1,i+j)*pt.get(i).x)/(fact(i)*fact(j-i));
sigy += (pow(-1,i+j)*pt.get(i).y)/(fact(i)*fact(j-i));
}
coefx = pi*sigx;
coefy = pi*sigy;
Cx.set(j,coefx);
Cy.set(j,coefy);
}
}
//**************************************
void drwText() {
float indent = SUM.get(0);
beginShape();
for (int i=0; i<rp.length; i++) {
if(i>0){
beginContour();
}
for (int j=0; j<rp[i].length; j++) {
float t = 0;
indent = rp[i][j].x+SUM.get(0);
float targetArcLength = indent;
int index = IndexOfLargestValueSmallerThan(targetArcLength);
if (SUM.get(index)==targetArcLength) {
t = index/(SUM.size()-1);
} else {
float lengthBefore = SUM.get(index);
float lengthAfter = SUM.get(index+1);
float segmentLength = lengthAfter - lengthBefore;
float segmentFraction = (targetArcLength - lengthBefore)/segmentLength;
t = (index+segmentFraction)/(SUM.size()-1);
}
//***************************here
float x = 0;
float y = 0;
float vx = 0;
float vy = 0;
for(int l=0; l<=num; l++){
x += Cx.get(l)*pow(t,l);
y += Cy.get(l)*pow(t,l);
}
for(int l=1; l<=num; l++){
vx += l*Cx.get(l)*pow(t,l-1);
vy += l*Cy.get(l)*pow(t,l-1);
}
//**************************************
PVector P = new PVector(x, rp[i][j].y+y);
PVector ldir = new PVector(P.x-x, P.y-y);
PVector dir = new PVector(vy, -vx);
//
ldir.rotate(dir.heading()+PI/2);
vertex(x+ldir.x, y+ldir.y);
}
if(i>0&&i<rp.length){
endContour();
}
}
endShape();
}
}
class cntrlPoint{
float x,y;
cntrlPoint(float _x, float _y){
x = _x;
y = _y;
}
void update(float _newx, float _newy){
x = _newx;
y = _newy;
}
}
这是如何使用公共类frome的一个后续步骤。其他处理选项卡中的java文件?;使用来自的Usage类中的示例。java文件-有完整的文档吗?-处理2。x和3。x论坛,我有这个: /tmp/Sketch/Foo.java 这个例子运行得很好,但是如果我取消注释import peasy。组织 行,则编译失败: 当然,我确实在下安装了PeasyCam,如果我导入peasy.*它工作得很好 来自草图。 我
我使用的是陀螺仪/加速计传感器(https://www.sparkfun.com/products/13284)用Arduino来记录旋转。我总共使用了八个这样的传感器。我还使用多路复用器来帮助多个传感器(https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-breakout/overview).在我的Arduino
我试着把加工草图与多个。pde文件(标签或类)在我的网站上,但它似乎不起作用。你应该能够点击,使球出现在屏幕上反弹。然而,似乎并没有第二次出现。pde文件,因此,草图不能完全工作。 http://willhay.io/processing/一个普通的单文件草图效果很好,我认为这与这个草图有一个球有关。应该出现的球的pde类。
我目前正在研究一种数据可视化技术,它从电影中获取信息,实时播放并同时创建。为此,我想有两个独立的草图窗口。一个窗口应显示实时播放的电影,另一个窗口应显示正在进行的可视化。 我似乎不知道如何轻松地添加另一个草图窗口,并尝试了一些在处理3中不再工作的示例。 然后我偶然发现了这个例子:https://gist.github.com/atduskgreg/666e46c8408e2a33b09a 尽管我可
下面的代码旨在将蓝色背景和三个移动形状(圆形、正方形、三角形)绘制到屏幕上。然而,代码是用面向对象编程编写的,我的草图在处理IDE的Java模式下工作得很好,但在OpenProcessing中却不能工作,这是不对的。代码编译得很好。我想我在OOP中做了一些不正确的事情。谁能帮帮我吗?谢了!
我正在调试一个HiveProcessor,它遵循官方的PutHiveStreaming处理器,但它写入的是Hive2.x,而不是3.x。该流在Nifi cluster 1.7.1中运行。尽管发生此异常,但数据仍被写入配置单元。 例外情况是: 有人做过类似的事吗?或者有没有更简单的方法来调试自定义处理器?