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POAndroid Vertical and Horizontal Scrolling in OpenGLES 2.0
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copied!<p>Can any one give me a example on how to add vertical and horizontal scroll till the end of the GLSurfaceview which is zoomed. I have tried using Matrix.Translate and Matrix.Rotate with 0deg angle none of it works.</p> <p>The ways i have used. In here dx and dy are the amount scrolled which i get from onTouch multiplied by a constant factor:</p> <p>way 1:</p> <p>@Override public void onDrawFrame(GL10 unused) {</p> <pre><code>mOffset = mPositionX + mPositionY; // Draw background color GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT); // Set the camera position (View matrix) Matrix.setLookAtM(mVMatrix, 0, mOffset, mOffset, -3, mOffset, mOffset, 0f, 0.0f, 1.0f, 0.0f); // Calculate the projection and view transformation Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0); mGraph.draw(mMVPMatrix); mLine.draw(mMVPMatrix); </code></pre> <p>}</p> <p>way 2: </p> <p>@Override public void onDrawFrame(GL10 unused) {</p> <pre><code>mOffset = mPositionX + mPositionY; Matrix.frustumM(mProjMatrix, 0, mSurfaceRatio * zoomFactor, -mSurfaceRatio * zoomFactor, -1 * (zoomFactor + mOffset), zoomFactor + mOffset, 3, 7); // Draw background color GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT); // Set the camera position (View matrix) Matrix.setLookAtM(mVMatrix, 0, 0, 0, -3, 0f, 0f, 0f, 0.0f, 1.0f, 0.0f); // Calculate the projection and view transformation Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0); mGraph.draw(mMVPMatrix); mLine.draw(mMVPMatrix); </code></pre> <p>}</p> <p>way 3: </p> <p>@Override public void onDrawFrame(GL10 unused) {</p> <pre><code>mOffset = mPositionX + mPositionY; // Draw background color GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT); Matrix.rotateM(mRotationMatrix, 0, 0, 0, mOffset, 0); Matrix.multiplyMM(mProjMatrix, 0, mProjMatrix, 0, mRotationMatrix, 0); // Set the camera position (View matrix) Matrix.setLookAtM(mVMatrix, 0, 0, 0, -3, 0f, 0f, 0f, 0.0f, 1.0f, 0.0f); // Calculate the projection and view transformation Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0); mGraph.draw(mMVPMatrix); mLine.draw(mMVPMatrix); </code></pre> <p>}</p>

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