I just found another useful trick. Originally I wanted to use OpenGL
because the ModelView matrix makes it very easy to rotate objects in
3D. I found something very similar in android.graphics.camera which
has three different routines for rotating (RotateX, RotateY, and
RotateZ). Here is the code snippet from my project
// Member variables at top of class
private float mYaw = 0; // Set these to whatever you like
private float mRoll = 0;
private float mPitch = 0;
private Camera mCamera = new Camera();
@Override
protected void dispatchDraw(Canvas canvas) {
canvas.save(Canvas.MATRIX_SAVE_FLAG);
// Save the current Camera matrix
mCamera.save();
// Setup the camera rotations
mCamera.rotateZ(-mYaw);
mCamera.rotateY(-mRoll);
mCamera.rotateX(-mPitch);
// Output the camera rotations to a matrix
mCamera.getMatrix(mMatrix);
mCamera.restore();
// Perform some other transforms on the matrix
mMatrix.preTranslate(-getWidth() * 0.5f, -getHeight() * 0.5f);
mMatrix.postTranslate(getWidth() * 0.5f, getHeight() * 0.5f);
// Apply the matrix to the canvas
canvas.concat(mMatrix);
// This code is from the MapViewCompassDemo
mCanvas.delegate = canvas;
super.dispatchDraw(mCanvas);
canvas.restore();
}
There you have it.
Romain Guy, do you mean that OpenGL is not supported in the Canvas
class? Surely it is still useful for rendering textures.
Also, does anyone know what sort of GPU hardware (if any) will be in
the G1?
-Marc
On Oct 12, 4:38 pm, "Romain Guy" <[EMAIL PROTECTED]> wrote:
> Rendering to OpenGL is a feature that got dropped for 1.0. Note that it
> would simply render the same way as with a normal Canvas, it would not
> automagically draw on an arbitrary mesh.
>
> On Oct 12, 2008 4:33 PM, "sandroid" <[EMAIL PROTECTED]> wrote:
>
> Yes, I'm getting some good results too. I also found out that you can
> get a Bitmap of the MapView by do the following
>
> 1) Create a Bitmap
> 2) Construct a Canvas with Bitmap as an input argument
> 3) call something like mMapView.draw(canvas) and it will draw the view
> to the canvas instead of to the screen.
>
> I noticed the Canvas constructor can also use a GL context. So does
> that mean the MapView will render directly to the framebuffer?
> Perhaps there is an easy way to render the MapView to the famous Utah
> Teapot.
>
> http://en.wikipedia.org/wiki/Utah_teapot
>
> If anyone knows how to accomplish this I would be very impressed.
>
> On Oct 11, 5:16 pm, Esteem <[EMAIL PROTECTED]> wrote: > I just
> experimented real quick on implim...
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