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
17package android.graphics;
18
19public class SweepGradient extends Shader {
20
21    /**
22     * A subclass of Shader that draws a sweep gradient around a center point.
23     *
24     * @param cx       The x-coordinate of the center
25     * @param cy       The y-coordinate of the center
26     * @param colors   The colors to be distributed between around the center.
27     *                 There must be at least 2 colors in the array.
28     * @param positions May be NULL. The relative position of
29     *                 each corresponding color in the colors array, beginning
30     *                 with 0 and ending with 1.0. If the values are not
31     *                 monotonic, the drawing may produce unexpected results.
32     *                 If positions is NULL, then the colors are automatically
33     *                 spaced evenly.
34     */
35    public SweepGradient(float cx, float cy,
36                         int colors[], float positions[]) {
37        if (colors.length < 2) {
38            throw new IllegalArgumentException("needs >= 2 number of colors");
39        }
40        if (positions != null && colors.length != positions.length) {
41            throw new IllegalArgumentException(
42                        "color and position arrays must be of equal length");
43        }
44        native_instance = nativeCreate1(cx, cy, colors, positions);
45        native_shader = nativePostCreate1(native_instance, cx, cy, colors, positions);
46    }
47
48    /**
49     * A subclass of Shader that draws a sweep gradient around a center point.
50     *
51     * @param cx       The x-coordinate of the center
52     * @param cy       The y-coordinate of the center
53     * @param color0   The color to use at the start of the sweep
54     * @param color1   The color to use at the end of the sweep
55     */
56    public SweepGradient(float cx, float cy, int color0, int color1) {
57        native_instance = nativeCreate2(cx, cy, color0, color1);
58        native_shader = nativePostCreate2(native_instance, cx, cy, color0, color1);
59    }
60
61    private static native int nativeCreate1(float x, float y, int colors[], float positions[]);
62    private static native int nativeCreate2(float x, float y, int color0, int color1);
63
64    private static native int nativePostCreate1(int native_shader, float cx, float cy,
65            int[] colors, float[] positions);
66    private static native int nativePostCreate2(int native_shader, float cx, float cy,
67            int color0, int color1);
68}
69
70