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 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A subclass of Shader that draws a sweep gradient around a center point. 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cx The x-coordinate of the center 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cy The y-coordinate of the center 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param colors The colors to be distributed between around the center. 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * There must be at least 2 colors in the array. 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param positions May be NULL. The relative position of 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * each corresponding color in the colors array, beginning 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * with 0 and ending with 1.0. If the values are not 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * monotonic, the drawing may produce unexpected results. 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If positions is NULL, then the colors are automatically 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * spaced evenly. 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SweepGradient(float cx, float cy, 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int colors[], float positions[]) { 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (colors.length < 2) { 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalArgumentException("needs >= 2 number of colors"); 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (positions != null && colors.length != positions.length) { 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalArgumentException( 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project "color and position arrays must be of equal length"); 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project native_instance = nativeCreate1(cx, cy, colors, positions); 45ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy native_shader = nativePostCreate1(native_instance, cx, cy, colors, positions); 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A subclass of Shader that draws a sweep gradient around a center point. 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cx The x-coordinate of the center 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param cy The y-coordinate of the center 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param color0 The color to use at the start of the sweep 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param color1 The color to use at the end of the sweep 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SweepGradient(float cx, float cy, int color0, int color1) { 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project native_instance = nativeCreate2(cx, cy, color0, color1); 58ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy native_shader = nativePostCreate2(native_instance, cx, cy, color0, color1); 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 61ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy private static native int nativeCreate1(float x, float y, int colors[], float positions[]); 62ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy private static native int nativeCreate2(float x, float y, int color0, int color1); 63ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy 64ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy private static native int nativePostCreate1(int native_shader, float cx, float cy, 65ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy int[] colors, float[] positions); 66ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy private static native int nativePostCreate2(int native_shader, float cx, float cy, 67ee916f14cbd1fe1422c063ce2ef7b185e2bc5c6fRomain Guy int color0, int color1); 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 70