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anddev.org • View topic - Drawing two orthogonal strings in 3d space in Android Canvas

Drawing two orthogonal strings in 3d space in Android Canvas

Problems with Canvas, OpenGL, etc...

Drawing two orthogonal strings in 3d space in Android Canvas

Postby hasan » Mon Nov 26, 2012 9:05 am

I want to draw two strings in canvas.First string must be rotated around Y axis,for example 45 degrees.Second string must be start at the end of first string and also it must be orthogonal to first string.

This is my code:

Code: Select all
String text = "In the";
float textWidth = redPaint.measureText(text);

Matrix m0 = new Matrix();
Matrix m1 = new Matrix();
Matrix m2 = new Matrix();
mCamera = new Camera();
canvas.setMatrix(null);
canvas.save();

mCamera.rotateY(45);
mCamera.getMatrix(m0);
m0.preTranslate(-100, -100);
m0.postTranslate(100, 100);
canvas.setMatrix(m0);
canvas.drawText(text, 100, 100, redPaint);

mCamera = new Camera();
mCamera.rotateY(90);
mCamera.getMatrix(m1); 
m1.preTranslate(-textWidth - 100, -100);
m1.postTranslate(textWidth + 100, 100);

m2.setConcat(m1, m0);
canvas.setMatrix(m2);
canvas.drawText(text, 100 + textWidth, 100, greenPaint);

But in result,only first string(text with red font)is visible.

How can I do drawing two orthogonal strings in 3d space?
hasan
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Posts: 1
Joined: Mon Nov 26, 2012 9:01 am

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