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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.graphics;
import java.awt.GradientPaint;
import java.awt.Color;
import java.awt.Paint;
public class LinearGradient extends Shader {
private GradientPaint mGradientPaint;
/**
* Create a shader that draws a linear gradient along a line.
*
* @param x0 The x-coordinate for the start of the gradient line
* @param y0 The y-coordinate for the start of the gradient line
* @param x1 The x-coordinate for the end of the gradient line
* @param y1 The y-coordinate for the end of the gradient line
* @param colors The colors to be distributed along the gradient line
* @param positions May be null. The relative positions [0..1] of each
* corresponding color in the colors array. If this is null, the
* the colors are distributed evenly along the gradient line.
* @param tile The Shader tiling mode
*/
public LinearGradient(float x0, float y0, float x1, float y1, int colors[], float positions[],
TileMode tile) {
if (colors.length < 2) {
throw new IllegalArgumentException("needs >= 2 number of colors");
}
if (positions != null && colors.length != positions.length) {
throw new IllegalArgumentException("color and position arrays must be of equal length");
}
// FIXME implement multi color linear gradient
if (colors.length == 2) {
// The hasAlpha flag in Color() is only used to enforce alpha to 0xFF if false.
// If true the alpha is read from the int.
mGradientPaint = new GradientPaint(x0, y0, new Color(colors[0], true /* hasalpha */),
x1, y1, new Color(colors[1], true /* hasalpha */), tile != TileMode.CLAMP);
}
}
/**
* Create a shader that draws a linear gradient along a line.
*
* @param x0 The x-coordinate for the start of the gradient line
* @param y0 The y-coordinate for the start of the gradient line
* @param x1 The x-coordinate for the end of the gradient line
* @param y1 The y-coordinate for the end of the gradient line
* @param color0 The color at the start of the gradient line.
* @param color1 The color at the end of the gradient line.
* @param tile The Shader tiling mode
*/
public LinearGradient(float x0, float y0, float x1, float y1, int color0, int color1,
TileMode tile) {
// The hasAlpha flag in Color() is only used to enforce alpha to 0xFF if false.
// If true the alpha is read from the int.
mGradientPaint = new GradientPaint(x0, y0, new Color(color0, true /* hasalpha */), x1, y1,
new Color(color1, true /* hasalpha */), tile != TileMode.CLAMP);
}
// ---------- Custom Methods
@Override
public Paint getJavaPaint() {
return mGradientPaint;
}
}
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