19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.graphics; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class SweepGradient extends Shader { 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 21e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private static final int TYPE_COLORS_AND_POSITIONS = 1; 22e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private static final int TYPE_COLOR_START_AND_COLOR_END = 2; 23e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio 24e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio /** 25e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio * Type of the LinearGradient: can be either TYPE_COLORS_AND_POSITIONS or 26e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio * TYPE_COLOR_START_AND_COLOR_END. 27e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio */ 28e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private int mType; 29e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio 30e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private float mCx; 31e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private float mCy; 32e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private int[] mColors; 33e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private float[] mPositions; 34e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private int mColor0; 35e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio private int mColor1; 36e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A subclass of Shader that draws a sweep gradient around a center point. 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cx The x-coordinate of the center 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cy The y-coordinate of the center 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param colors The colors to be distributed between around the center. 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * There must be at least 2 colors in the array. 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param positions May be NULL. The relative position of 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * each corresponding color in the colors array, beginning 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * with 0 and ending with 1.0. If the values are not 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * monotonic, the drawing may produce unexpected results. 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If positions is NULL, then the colors are automatically 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * spaced evenly. 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SweepGradient(float cx, float cy, 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int colors[], float positions[]) { 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (colors.length < 2) { 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalArgumentException("needs >= 2 number of colors"); 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (positions != null && colors.length != positions.length) { 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalArgumentException( 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project "color and position arrays must be of equal length"); 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 60e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mType = TYPE_COLORS_AND_POSITIONS; 61e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mCx = cx; 62e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mCy = cy; 63e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mColors = colors; 64e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mPositions = positions; 65866cf65cc3c53f67836c9157d5c661adfdbd25e1Leon Scroggins III init(nativeCreate1(cx, cy, colors, positions)); 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A subclass of Shader that draws a sweep gradient around a center point. 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cx The x-coordinate of the center 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cy The y-coordinate of the center 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param color0 The color to use at the start of the sweep 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param color1 The color to use at the end of the sweep 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SweepGradient(float cx, float cy, int color0, int color1) { 77e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mType = TYPE_COLOR_START_AND_COLOR_END; 78e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mCx = cx; 79e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mCy = cy; 80e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mColor0 = color0; 81e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio mColor1 = color1; 82866cf65cc3c53f67836c9157d5c661adfdbd25e1Leon Scroggins III init(nativeCreate2(cx, cy, color0, color1)); 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 85e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio /** 86e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio * @hide 87e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio */ 88e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio @Override 89e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio protected Shader copy() { 90e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio final SweepGradient copy; 91e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio switch (mType) { 92e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio case TYPE_COLORS_AND_POSITIONS: 939622adf6e8028aebd57213371c4f2c6c26fc63e5Romain Guy copy = new SweepGradient(mCx, mCy, mColors.clone(), 949622adf6e8028aebd57213371c4f2c6c26fc63e5Romain Guy mPositions != null ? mPositions.clone() : null); 95e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio break; 96e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio case TYPE_COLOR_START_AND_COLOR_END: 97e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio copy = new SweepGradient(mCx, mCy, mColor0, mColor1); 98e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio break; 99e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio default: 100e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio throw new IllegalArgumentException("SweepGradient should be created with either " + 101e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio "colors and positions or start color and end color"); 102e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio } 103e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio copyLocalMatrix(copy); 104e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio return copy; 105e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio } 106e3c526f4f603e83c5fa8b9e399506b085f5648b7Fabrice Di Meglio 10736bef0bf30d6bae48cf3837df351075ca4fce654Ashok Bhat private static native long nativeCreate1(float x, float y, int colors[], float positions[]); 10836bef0bf30d6bae48cf3837df351075ca4fce654Ashok Bhat private static native long nativeCreate2(float x, float y, int color0, int color1); 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 111