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 22 public class RadialGradient extends Shader { 23 24 private static final int TYPE_COLORS_AND_POSITIONS = 1; 25 private static final int TYPE_COLOR_CENTER_AND_COLOR_EDGE = 2; 26 27 /** 28 * Type of the RadialGradient: can be either TYPE_COLORS_AND_POSITIONS or 29 * TYPE_COLOR_CENTER_AND_COLOR_EDGE. 30 */ 31 private int mType; 32 33 private float mX; 34 private float mY; 35 private float mRadius; 36 private int[] mColors; 37 private float[] mPositions; 38 private int mCenterColor; 39 private int mEdgeColor; 40 41 private TileMode mTileMode; 42 43 /** Create a shader that draws a radial gradient given the center and radius. 44 @param centerX The x-coordinate of the center of the radius 45 @param centerY The y-coordinate of the center of the radius 46 @param radius Must be positive. The radius of the circle for this gradient. 47 @param colors The colors to be distributed between the center and edge of the circle 48 @param stops May be <code>null</code>. Valid values are between <code>0.0f</code> and 49 <code>1.0f</code>. The relative position of each corresponding color in 50 the colors array. If <code>null</code>, colors are distributed evenly 51 between the center and edge of the circle. 52 @param tileMode The Shader tiling mode 53 */ RadialGradient(float centerX, float centerY, float radius, @NonNull int colors[], @Nullable float stops[], @NonNull TileMode tileMode)54 public RadialGradient(float centerX, float centerY, float radius, 55 @NonNull int colors[], @Nullable float stops[], @NonNull TileMode tileMode) { 56 if (radius <= 0) { 57 throw new IllegalArgumentException("radius must be > 0"); 58 } 59 if (colors.length < 2) { 60 throw new IllegalArgumentException("needs >= 2 number of colors"); 61 } 62 if (stops != null && colors.length != stops.length) { 63 throw new IllegalArgumentException("color and position arrays must be of equal length"); 64 } 65 mType = TYPE_COLORS_AND_POSITIONS; 66 mX = centerX; 67 mY = centerY; 68 mRadius = radius; 69 mColors = colors; 70 mPositions = stops; 71 mTileMode = tileMode; 72 init(nativeCreate1(centerX, centerY, radius, colors, stops, tileMode.nativeInt)); 73 } 74 75 /** Create a shader that draws a radial gradient given the center and radius. 76 @param centerX The x-coordinate of the center of the radius 77 @param centerY The y-coordinate of the center of the radius 78 @param radius Must be positive. The radius of the circle for this gradient 79 @param centerColor The color at the center of the circle. 80 @param edgeColor The color at the edge of the circle. 81 @param tileMode The Shader tiling mode 82 */ RadialGradient(float centerX, float centerY, float radius, int centerColor, int edgeColor, @NonNull TileMode tileMode)83 public RadialGradient(float centerX, float centerY, float radius, 84 int centerColor, int edgeColor, @NonNull TileMode tileMode) { 85 if (radius <= 0) { 86 throw new IllegalArgumentException("radius must be > 0"); 87 } 88 mType = TYPE_COLOR_CENTER_AND_COLOR_EDGE; 89 mX = centerX; 90 mY = centerY; 91 mRadius = radius; 92 mCenterColor = centerColor; 93 mEdgeColor = edgeColor; 94 mTileMode = tileMode; 95 init(nativeCreate2(centerX, centerY, radius, centerColor, edgeColor, tileMode.nativeInt)); 96 } 97 98 /** 99 * @hide 100 */ 101 @Override copy()102 protected Shader copy() { 103 final RadialGradient copy; 104 switch (mType) { 105 case TYPE_COLORS_AND_POSITIONS: 106 copy = new RadialGradient(mX, mY, mRadius, mColors.clone(), 107 mPositions != null ? mPositions.clone() : null, mTileMode); 108 break; 109 case TYPE_COLOR_CENTER_AND_COLOR_EDGE: 110 copy = new RadialGradient(mX, mY, mRadius, mCenterColor, mEdgeColor, mTileMode); 111 break; 112 default: 113 throw new IllegalArgumentException("RadialGradient should be created with either " + 114 "colors and positions or center color and edge color"); 115 } 116 copyLocalMatrix(copy); 117 return copy; 118 } 119 nativeCreate1(float x, float y, float radius, int colors[], float positions[], int tileMode)120 private static native long nativeCreate1(float x, float y, float radius, 121 int colors[], float positions[], int tileMode); nativeCreate2(float x, float y, float radius, int color0, int color1, int tileMode)122 private static native long nativeCreate2(float x, float y, float radius, 123 int color0, int color1, int tileMode); 124 } 125 126