Android – Create a Vignette effect

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  1. Create a Paint using the PorterDuff.Mode.DST_OUT as Xfermode
  2. Create a RadialGradient and assign to our Paint object as a Shader
  3. Alter the gradient matrix using the setLocalMatrix method.
  4. Use canvas.saveLayer when drawing

1. Paint using PorterDuff.Mode.DST_OUT

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2. Create the RadialGradient shader:

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1 English Essays About Music final float[] anchors = new float[]{0, 0.5f, 1}; Chemistry Ksp Help Shader shader = new, 0, 1, colors, anchors, Shader.TileMode.CLAMP); Chemistry Help For High School Students paint.setShader(shader);

3. Alter the gradient matrix

1 Stanford Application Essay matrix.postTranslate(rect.centerX(), rect.centerY()); matrix.postScale(rect.width() / 2, rect.height() / 2, rect.centerX(), rect.centerY()); Chemistry A Level Coursework Help Lang En shader.setLocalMatrix(matrix);

4. Draw on a canvas

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1 // 'pBitmapRect' is the current Bitmap rectangle Buy Comparison Contrast Essay canvas.saveLayer(pBitmapRect, mPaint, Canvas.ALL_SAVE_FLAG); // draw the black background Phd Thesis Cornell University canvas.drawRect(pBitmapRect, mBlackPaint); Pay For Essay Writing Australia // draw the vignette on the black background using our radial gradient Essay Of Responsibility canvas.drawOval(tempRect2, mPaintShader); Live Help Writing A Research Paper canvas.restore();

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