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 LinearGradient extends Shader {
20	/**	Create a shader that draws a linear gradient along a line.
21        @param x0           The x-coordinate for the start of the gradient line
22        @param y0           The y-coordinate for the start of the gradient line
23        @param x1           The x-coordinate for the end of the gradient line
24        @param y1           The y-coordinate for the end of the gradient line
25        @param  colors      The colors to be distributed along the gradient line
26        @param  positions   May be null. The relative positions [0..1] of
27                            each corresponding color in the colors array. If this is null,
28                            the the colors are distributed evenly along the gradient line.
29        @param  tile        The Shader tiling mode
30	*/
31	public LinearGradient(float x0, float y0, float x1, float y1, int colors[], float positions[],
32            TileMode tile) {
33        if (colors.length < 2) {
34            throw new IllegalArgumentException("needs >= 2 number of colors");
35        }
36        if (positions != null && colors.length != positions.length) {
37            throw new IllegalArgumentException("color and position arrays must be of equal length");
38        }
39        native_instance = nativeCreate1(x0, y0, x1, y1, colors, positions, tile.nativeInt);
40        native_shader = nativePostCreate1(native_instance, x0, y0, x1, y1, colors, positions,
41                tile.nativeInt);
42    }
43
44	/**	Create a shader that draws a linear gradient along a line.
45        @param x0       The x-coordinate for the start of the gradient line
46        @param y0       The y-coordinate for the start of the gradient line
47        @param x1       The x-coordinate for the end of the gradient line
48        @param y1       The y-coordinate for the end of the gradient line
49        @param  color0  The color at the start of the gradient line.
50        @param  color1  The color at the end of the gradient line.
51        @param  tile    The Shader tiling mode
52	*/
53	public LinearGradient(float x0, float y0, float x1, float y1, int color0, int color1,
54            TileMode tile) {
55        native_instance = nativeCreate2(x0, y0, x1, y1, color0, color1, tile.nativeInt);
56        native_shader = nativePostCreate2(native_instance, x0, y0, x1, y1, color0, color1,
57                tile.nativeInt);
58    }
59
60	private native int nativeCreate1(float x0, float y0, float x1, float y1,
61            int colors[], float positions[], int tileMode);
62	private native int nativeCreate2(float x0, float y0, float x1, float y1,
63            int color0, int color1, int tileMode);
64    private native int nativePostCreate1(int native_shader, float x0, float y0, float x1, float y1,
65            int colors[], float positions[], int tileMode);
66    private native int nativePostCreate2(int native_shader, float x0, float y0, float x1, float y1,
67            int color0, int color1, int tileMode);
68}
69