LinearGradient_Delegate.java revision 9066cfe9886ac131c34d59ed0e2d287b0e3c0087 
1/*
2 * Copyright (C) 2008 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
19import java.awt.GradientPaint;
20import java.awt.Color;
21import java.awt.Paint;
22
23public class LinearGradient extends Shader {
24
25    private GradientPaint mGradientPaint;
26
27    /** Create a shader that draws a linear gradient along a line.
28        @param x0           The x-coordinate for the start of the gradient line
29        @param y0           The y-coordinate for the start of the gradient line
30        @param x1           The x-coordinate for the end of the gradient line
31        @param y1           The y-coordinate for the end of the gradient line
32        @param  colors      The colors to be distributed along the gradient line
33        @param  positions   May be null. The relative positions [0..1] of
34                            each corresponding color in the colors array. If this is null,
35                            the the colors are distributed evenly along the gradient line.
36        @param  tile        The Shader tiling mode
37    */
38    public LinearGradient(float x0, float y0, float x1, float y1,
39                          int colors[], float positions[], TileMode tile) {
40        if (colors.length < 2) {
41            throw new IllegalArgumentException("needs >= 2 number of colors");
42        }
43        if (positions != null && colors.length != positions.length) {
44            throw new IllegalArgumentException("color and position arrays must be of equal length");
45        }
46
47        // FIXME implement multi color linear gradient
48    }
49
50    /** Create a shader that draws a linear gradient along a line.
51        @param x0       The x-coordinate for the start of the gradient line
52        @param y0       The y-coordinate for the start of the gradient line
53        @param x1       The x-coordinate for the end of the gradient line
54        @param y1       The y-coordinate for the end of the gradient line
55        @param  color0  The color at the start of the gradient line.
56        @param  color1  The color at the end of the gradient line.
57        @param  tile    The Shader tiling mode
58    */
59    public LinearGradient(float x0, float y0, float x1, float y1,
60                          int color0, int color1, TileMode tile) {
61        mGradientPaint = new GradientPaint(x0, y0, new Color(color0, true /* hasalpha */),
62                x1,y1, new Color(color1, true /* hasalpha */), tile != TileMode.CLAMP);
63    }
64
65    //---------- Custom Methods
66
67    public Paint getPaint() {
68        return mGradientPaint;
69    }
70}
71
72