setPolyToPoly不适用

Question

谁能解决我遇到的图形问题。这段代码根本不应用setPolyToPoly ..它会进行Camera旋转，但不会进行polyToPoly转换..我不明白为什么。

final Camera camera = mCamera;
final Matrix matrix = t.getMatrix();

camera.save();
camera.translate(x, y, z);
camera.getMatrix(matrix);
camera.restore();

matrix.setPolyToPoly(sourceArr, 0, destArr, 0, sourceArr.length >> 1);
matrix.preTranslate(-0, -height);
matrix.postTranslate(0, height);

Answer 1

该样本并不完全适合您的问题，但可能会为您指明正确的方向。在此示例中，将矩阵应用于放置在透视图中的位图。如果将我与您的代码段进行比较，则可以设置多边形，但它不会应用于相机。

    Bitmap  bitmap2 = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
    Canvas canvas2 = new Canvas(bitmap2);       
    canvas2.drawColor(Color.WHITE);
    Paint rectPaint2 = new Paint();
    rectPaint2.setColor(Color.GREEN);
    canvas2.drawRect(20, 20, 180, 180, rectPaint2);
    Matrix matrix2 = new Matrix();
    float deform2 = 20f;
    float[] src2 = new float[] { 0, 0, bitmap2.getWidth(), 0, bitmap2.getWidth(), bitmap2.getHeight(), 0, bitmap2.getHeight() };
    float[] dst2 = new float[] { 0, 0, bitmap2.getWidth() - deform2, deform2, bitmap2.getWidth() - deform2, bitmap2.getHeight() - deform2, 0, bitmap2.getHeight() };
    matrix2.setPolyToPoly(src2, 0, dst2, 0, src2.length >> 1);
    Bitmap bMatrix2= Bitmap.createBitmap(bitmap2, 0, 0, bitmap2.getWidth(), bitmap2.getHeight(), matrix2, true);

    ImageView ivSecond = (ImageView) findViewById(R.id.ivSecond);
    ivSecond.setImageBitmap(bMatrix2);