| /* |
| * 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 com.android.tools.layoutlib.annotations.LayoutlibDelegate; |
| |
| import java.awt.image.DataBufferInt; |
| import java.awt.image.Raster; |
| import java.awt.image.SampleModel; |
| |
| /** |
| * Delegate implementing the native methods of android.graphics.SweepGradient |
| * |
| * Through the layoutlib_create tool, the original native methods of SweepGradient 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 SweepGradient 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 SweepGradient_Delegate extends Gradient_Delegate { |
| |
| // ---- delegate data ---- |
| private java.awt.Paint mJavaPaint; |
| |
| // ---- Public Helper methods ---- |
| |
| @Override |
| public java.awt.Paint getJavaPaint() { |
| return mJavaPaint; |
| } |
| |
| // ---- native methods ---- |
| |
| @LayoutlibDelegate |
| /*package*/ static long nativeCreate(long matrix, float x, float y, long[] colors, |
| float[] positions, long colorSpaceHandle) { |
| SweepGradient_Delegate newDelegate = new SweepGradient_Delegate(matrix, x, y, colors, |
| positions); |
| return sManager.addNewDelegate(newDelegate); |
| } |
| |
| // ---- Private delegate/helper methods ---- |
| |
| /** |
| * A subclass of Shader that draws a sweep gradient around a center point. |
| * |
| * @param nativeMatrix reference to the shader's native transformation matrix |
| * @param cx The x-coordinate of the center |
| * @param cy The y-coordinate of the center |
| * @param colors The colors to be distributed between around the center. |
| * There must be at least 2 colors in the array. |
| * @param positions May be NULL. The relative position of |
| * each corresponding color in the colors array, beginning |
| * with 0 and ending with 1.0. If the values are not |
| * monotonic, the drawing may produce unexpected results. |
| * If positions is NULL, then the colors are automatically |
| * spaced evenly. |
| */ |
| private SweepGradient_Delegate(long nativeMatrix, float cx, float cy, |
| long[] colors, float[] positions) { |
| super(nativeMatrix, colors, positions); |
| mJavaPaint = new SweepGradientPaint(cx, cy, mColors, mPositions); |
| } |
| |
| private class SweepGradientPaint extends GradientPaint { |
| |
| private final float mCx; |
| private final float mCy; |
| |
| public SweepGradientPaint(float cx, float cy, int[] colors, |
| float[] positions) { |
| super(colors, positions, null /*tileMode*/); |
| mCx = cx; |
| mCy = cy; |
| } |
| |
| @Override |
| 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 SweepGradient", 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 SweepGradient", e, null /*data*/); |
| localMatrix = new java.awt.geom.AffineTransform(); |
| } |
| |
| return new SweepGradientPaintContext(canvasMatrix, localMatrix, colorModel); |
| } |
| |
| private class SweepGradientPaintContext 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 SweepGradientPaintContext( |
| java.awt.geom.AffineTransform canvasMatrix, |
| java.awt.geom.AffineTransform localMatrix, |
| java.awt.image.ColorModel colorModel) { |
| mCanvasMatrix = canvasMatrix; |
| mLocalMatrix = localMatrix; |
| mColorModel = colorModel; |
| } |
| |
| @Override |
| public void dispose() { |
| } |
| |
| @Override |
| public java.awt.image.ColorModel getColorModel() { |
| return mColorModel; |
| } |
| |
| @Override |
| public java.awt.image.Raster getRaster(int x, int y, int w, int h) { |
| |
| int[] data = new int[w*h]; |
| |
| // compute angle 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] - mCx; |
| pt1[1] = pt2[1] - mCy; |
| mLocalMatrix.transform(pt1, 0, pt2, 0, 1); |
| |
| float dx = pt2[0]; |
| float dy = pt2[1]; |
| |
| float angle; |
| if (dx == 0) { |
| angle = (float) (dy < 0 ? 3 * Math.PI / 2 : Math.PI / 2); |
| } else if (dy == 0) { |
| angle = (float) (dx < 0 ? Math.PI : 0); |
| } else { |
| angle = (float) Math.atan(dy / dx); |
| if (dx > 0) { |
| if (dy < 0) { |
| angle += Math.PI * 2; |
| } |
| } else { |
| angle += Math.PI; |
| } |
| } |
| |
| // convert to 0-1. value and get color |
| data[index++] = getGradientColor((float) (angle / (2 * Math.PI))); |
| } |
| } |
| |
| DataBufferInt dataBuffer = new DataBufferInt(data, data.length); |
| SampleModel colorModel = mColorModel.createCompatibleSampleModel(w, h); |
| return Raster.createWritableRaster(colorModel, dataBuffer, null); |
| } |
| |
| } |
| } |
| } |