1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.graphics; 18 19 import android.annotation.NonNull; 20 import android.annotation.Nullable; 21 import android.annotation.ColorInt; 22 23 public class RadialGradient extends Shader { 24 25 private static final int TYPE_COLORS_AND_POSITIONS = 1; 26 private static final int TYPE_COLOR_CENTER_AND_COLOR_EDGE = 2; 27 28 /** 29 * Type of the RadialGradient: can be either TYPE_COLORS_AND_POSITIONS or 30 * TYPE_COLOR_CENTER_AND_COLOR_EDGE. 31 */ 32 private int mType; 33 34 private float mX; 35 private float mY; 36 private float mRadius; 37 private int[] mColors; 38 private float[] mPositions; 39 private int mCenterColor; 40 private int mEdgeColor; 41 42 private TileMode mTileMode; 43 44 /** 45 * Create a shader that draws a radial gradient given the center and radius. 46 * 47 * @param centerX The x-coordinate of the center of the radius 48 * @param centerY The y-coordinate of the center of the radius 49 * @param radius Must be positive. The radius of the circle for this gradient. 50 * @param colors The colors to be distributed between the center and edge of the circle 51 * @param stops May be <code>null</code>. Valid values are between <code>0.0f</code> and 52 * <code>1.0f</code>. The relative position of each corresponding color in 53 * the colors array. If <code>null</code>, colors are distributed evenly 54 * between the center and edge of the circle. 55 * @param tileMode The Shader tiling mode 56 */ 57 public RadialGradient(float centerX, float centerY, float radius, 58 @NonNull @ColorInt int colors[], @Nullable float stops[], 59 @NonNull TileMode tileMode) { 60 if (radius <= 0) { 61 throw new IllegalArgumentException("radius must be > 0"); 62 } 63 if (colors.length < 2) { 64 throw new IllegalArgumentException("needs >= 2 number of colors"); 65 } 66 if (stops != null && colors.length != stops.length) { 67 throw new IllegalArgumentException("color and position arrays must be of equal length"); 68 } 69 mType = TYPE_COLORS_AND_POSITIONS; 70 mX = centerX; 71 mY = centerY; 72 mRadius = radius; 73 mColors = colors.clone(); 74 mPositions = stops != null ? stops.clone() : null; 75 mTileMode = tileMode; 76 } 77 78 /** 79 * Create a shader that draws a radial gradient given the center and radius. 80 * 81 * @param centerX The x-coordinate of the center of the radius 82 * @param centerY The y-coordinate of the center of the radius 83 * @param radius Must be positive. The radius of the circle for this gradient 84 * @param centerColor The color at the center of the circle. 85 * @param edgeColor The color at the edge of the circle. 86 * @param tileMode The Shader tiling mode 87 */ 88 public RadialGradient(float centerX, float centerY, float radius, 89 @ColorInt int centerColor, @ColorInt int edgeColor, @NonNull TileMode tileMode) { 90 if (radius <= 0) { 91 throw new IllegalArgumentException("radius must be > 0"); 92 } 93 mType = TYPE_COLOR_CENTER_AND_COLOR_EDGE; 94 mX = centerX; 95 mY = centerY; 96 mRadius = radius; 97 mCenterColor = centerColor; 98 mEdgeColor = edgeColor; 99 mTileMode = tileMode; 100 } 101 102 @Override 103 long createNativeInstance(long nativeMatrix) { 104 if (mType == TYPE_COLORS_AND_POSITIONS) { 105 return nativeCreate1(nativeMatrix, mX, mY, mRadius, 106 mColors, mPositions, mTileMode.nativeInt); 107 } else { // TYPE_COLOR_CENTER_AND_COLOR_EDGE 108 return nativeCreate2(nativeMatrix, mX, mY, mRadius, 109 mCenterColor, mEdgeColor, mTileMode.nativeInt); 110 } 111 } 112 113 /** 114 * @hide 115 */ 116 @Override 117 protected Shader copy() { 118 final RadialGradient copy; 119 if (mType == TYPE_COLORS_AND_POSITIONS) { 120 copy = new RadialGradient(mX, mY, mRadius, mColors.clone(), 121 mPositions != null ? mPositions.clone() : null, mTileMode); 122 } else { // TYPE_COLOR_CENTER_AND_COLOR_EDGE 123 copy = new RadialGradient(mX, mY, mRadius, mCenterColor, mEdgeColor, mTileMode); 124 } 125 copyLocalMatrix(copy); 126 return copy; 127 } 128 129 private static native long nativeCreate1(long matrix, float x, float y, float radius, 130 int colors[], float positions[], int tileMode); 131 private static native long nativeCreate2(long matrix, float x, float y, float radius, 132 int color0, int color1, int tileMode); 133 } 134 135
