| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.graphics; |
| |
| import com.android.ide.common.rendering.api.LayoutLog; |
| import com.android.layoutlib.bridge.Bridge; |
| import com.android.layoutlib.bridge.impl.DelegateManager; |
| |
| import android.graphics.Shader.TileMode; |
| |
| /** |
| * Delegate implementing the native methods of android.graphics.RadialGradient |
| * |
| * Through the layoutlib_create tool, the original native methods of RadialGradient have been |
| * replaced by calls to methods of the same name in this delegate class. |
| * |
| * This class behaves like the original native implementation, but in Java, keeping previously |
| * native data into its own objects and mapping them to int that are sent back and forth between |
| * it and the original RadialGradient class. |
| * |
| * Because this extends {@link Shader_Delegate}, there's no need to use a {@link DelegateManager}, |
| * as all the Shader classes will be added to the manager owned by {@link Shader_Delegate}. |
| * |
| * @see Shader_Delegate |
| * |
| */ |
| public class RadialGradient_Delegate extends Gradient_Delegate { |
| |
| // ---- delegate data ---- |
| private java.awt.Paint mJavaPaint; |
| |
| // ---- Public Helper methods ---- |
| |
| @Override |
| public java.awt.Paint getJavaPaint() { |
| return mJavaPaint; |
| } |
| |
| // ---- native methods ---- |
| |
| /*package*/ static int nativeCreate1(float x, float y, float radius, |
| int colors[], float positions[], int tileMode) { |
| RadialGradient_Delegate newDelegate = new RadialGradient_Delegate(x, y, radius, |
| colors, positions, Shader_Delegate.getTileMode(tileMode)); |
| return sManager.addDelegate(newDelegate); |
| } |
| |
| /*package*/ static int nativeCreate2(float x, float y, float radius, |
| int color0, int color1, int tileMode) { |
| return nativeCreate1(x, y, radius, new int[] { color0, color1 }, null /*positions*/, |
| tileMode); |
| } |
| |
| /*package*/ static int nativePostCreate1(int native_shader, float x, float y, float radius, |
| int colors[], float positions[], int tileMode) { |
| // nothing to be done here. |
| return 0; |
| } |
| |
| /*package*/ static int nativePostCreate2(int native_shader, float x, float y, float radius, |
| int color0, int color1, int tileMode) { |
| // nothing to be done here. |
| return 0; |
| } |
| |
| // ---- Private delegate/helper methods ---- |
| |
| /** |
| * Create a shader that draws a radial gradient given the center and radius. |
| * |
| * @param x The x-coordinate of the center of the radius |
| * @param y The y-coordinate of the center of the radius |
| * @param radius Must be positive. The radius of the circle for this |
| * gradient |
| * @param colors The colors to be distributed between the center and edge of |
| * the circle |
| * @param positions May be NULL. The relative position of each corresponding |
| * color in the colors array. If this is NULL, the the colors are |
| * distributed evenly between the center and edge of the circle. |
| * @param tile The Shader tiling mode |
| */ |
| private RadialGradient_Delegate(float x, float y, float radius, int colors[], float positions[], |
| TileMode tile) { |
| super(colors, positions); |
| mJavaPaint = new RadialGradientPaint(x, y, radius, mColors, mPositions, tile); |
| } |
| |
| private class RadialGradientPaint extends GradientPaint { |
| |
| private final float mX; |
| private final float mY; |
| private final float mRadius; |
| |
| public RadialGradientPaint(float x, float y, float radius, |
| int[] colors, float[] positions, TileMode mode) { |
| super(colors, positions, mode); |
| mX = x; |
| mY = y; |
| mRadius = radius; |
| } |
| |
| public java.awt.PaintContext createContext( |
| java.awt.image.ColorModel colorModel, |
| java.awt.Rectangle deviceBounds, |
| java.awt.geom.Rectangle2D userBounds, |
| java.awt.geom.AffineTransform xform, |
| java.awt.RenderingHints hints) { |
| precomputeGradientColors(); |
| |
| java.awt.geom.AffineTransform canvasMatrix; |
| try { |
| canvasMatrix = xform.createInverse(); |
| } catch (java.awt.geom.NoninvertibleTransformException e) { |
| Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE, |
| "Unable to inverse matrix in RadialGradient", e, null /*data*/); |
| canvasMatrix = new java.awt.geom.AffineTransform(); |
| } |
| |
| java.awt.geom.AffineTransform localMatrix = getLocalMatrix(); |
| try { |
| localMatrix = localMatrix.createInverse(); |
| } catch (java.awt.geom.NoninvertibleTransformException e) { |
| Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE, |
| "Unable to inverse matrix in RadialGradient", e, null /*data*/); |
| localMatrix = new java.awt.geom.AffineTransform(); |
| } |
| |
| return new RadialGradientPaintContext(canvasMatrix, localMatrix, colorModel); |
| } |
| |
| private class RadialGradientPaintContext implements java.awt.PaintContext { |
| |
| private final java.awt.geom.AffineTransform mCanvasMatrix; |
| private final java.awt.geom.AffineTransform mLocalMatrix; |
| private final java.awt.image.ColorModel mColorModel; |
| |
| public RadialGradientPaintContext( |
| java.awt.geom.AffineTransform canvasMatrix, |
| java.awt.geom.AffineTransform localMatrix, |
| java.awt.image.ColorModel colorModel) { |
| mCanvasMatrix = canvasMatrix; |
| mLocalMatrix = localMatrix; |
| mColorModel = colorModel; |
| } |
| |
| public void dispose() { |
| } |
| |
| public java.awt.image.ColorModel getColorModel() { |
| return mColorModel; |
| } |
| |
| public java.awt.image.Raster getRaster(int x, int y, int w, int h) { |
| java.awt.image.BufferedImage image = new java.awt.image.BufferedImage(w, h, |
| java.awt.image.BufferedImage.TYPE_INT_ARGB); |
| |
| int[] data = new int[w*h]; |
| |
| // compute distance from each point to the center, and figure out the distance from |
| // it. |
| int index = 0; |
| float[] pt1 = new float[2]; |
| float[] pt2 = new float[2]; |
| for (int iy = 0 ; iy < h ; iy++) { |
| for (int ix = 0 ; ix < w ; ix++) { |
| // handle the canvas transform |
| pt1[0] = x + ix; |
| pt1[1] = y + iy; |
| mCanvasMatrix.transform(pt1, 0, pt2, 0, 1); |
| |
| // handle the local matrix |
| pt1[0] = pt2[0] - mX; |
| pt1[1] = pt2[1] - mY; |
| mLocalMatrix.transform(pt1, 0, pt2, 0, 1); |
| |
| float _x = pt2[0]; |
| float _y = pt2[1]; |
| float distance = (float) Math.sqrt(_x * _x + _y * _y); |
| |
| data[index++] = getGradientColor(distance / mRadius); |
| } |
| } |
| |
| image.setRGB(0 /*startX*/, 0 /*startY*/, w, h, data, 0 /*offset*/, w /*scansize*/); |
| |
| return image.getRaster(); |
| } |
| |
| } |
| } |
| |
| } |