在 Canvas 上绘制两个 3D 字符串？

我必须在画布上绘制 2 个字符串。字符串必须使用相同坐标第二根弦必须是第一根弦绕 Y 轴旋转 45 度的结果。结果必须如下所示：

这是我的代码：

Matrix matrix = new Matrix();
matrix = canvas.getMatrix();
mCamera = new Camera();


canvas.drawText("In the name of God", 30, 100, redPaint);
mCamera.rotateY(45);
mCamera.getMatrix(matrix);

matrix.preTranslate(30, 100);
//      matrix.postTranslate(-30, -100);

canvas.setMatrix(matrix);
canvas.drawText("In the name of God", 0, 0, greenPaint);

但上面代码的结果是：

你可以看到字符串的坐标不同.那么我做错了什么？我猜这是由错误的参数引起的matrix.preTranslate().

Update:

我将我的代码更改为：

canvas.drawText("In the name of God", 30, 100, redPaint);
mCamera.rotateY(45);
mCamera.getMatrix(matrix);
matrix.preTranslate(-30, -100);
matrix.postTranslate(30, 100);
canvas.setMatrix(matrix);
canvas.drawText("In the name of God", 0, 0, greenPaint);

or like:

canvas.drawText("In the name of God", 30, 100, redPaint);
mCamera.rotateY(45);
mCamera.getMatrix(matrix);
matrix.preTranslate(-30, -100);
//matrix.postTranslate(30, 100);
canvas.setMatrix(matrix);
canvas.drawText("In the name of God", 0, 0, greenPaint);

or like:

canvas.drawText("In the name of God", 30, 100, redPaint);
mCamera.rotateY(45);
mCamera.getMatrix(matrix);

matrix.preTranslate(-30, -100);
//      matrix.postTranslate(30, 100);
canvas.setMatrix(matrix);
canvas.drawText("In the name of God", 30, 100, greenPaint);

对于上述所有三个代码，结果如下所示：

我猜第二个文本超出了范围或位于status bar所以它是不可见的。

然后将我的代码更改为：

mCamera.rotateY(45);
mCamera.getMatrix(matrix);
matrix.preTranslate(-30, -100);
matrix.postTranslate(30, 100);
canvas.setMatrix(matrix);
canvas.drawText("In the name of God", 30, 100, greenPaint);

result:

感谢您的回复。我解决了问题。我必须使用canvas.concat()代替canvas.setMatrix.这是正确的代码：

Matrix matrix = new Matrix();
mCamera = new Camera();

canvas.drawText("In the name of God", 30, 100, redPaint);
mCamera.rotateY(60);
mCamera.getMatrix(matrix);

matrix.preTranslate(-30, -100);
matrix.postTranslate(30, 100);
canvas.concat(matrix);
canvas.drawText("In the name of God", 30, 100, greenPaint);