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/*
* Copyright (C) 2007 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;
public class LinearGradient extends Shader {
private static final int TYPE_COLORS_AND_POSITIONS = 1;
private static final int TYPE_COLOR_START_AND_COLOR_END = 2;
/**
* Type of the LinearGradient: can be either TYPE_COLORS_AND_POSITIONS or
* TYPE_COLOR_START_AND_COLOR_END.
*/
private int mType;
private float mX0;
private float mY0;
private float mX1;
private float mY1;
private int[] mColors;
private float[] mPositions;
private int mColor0;
private int mColor1;
private TileMode mTileMode;
/** 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");
}
mType = TYPE_COLORS_AND_POSITIONS;
mX0 = x0;
mY0 = y0;
mX1 = x1;
mY1 = y1;
mColors = colors;
mPositions = positions;
mTileMode = tile;
init(nativeCreate1(x0, y0, x1, y1, colors, positions, tile.nativeInt));
}
/** 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) {
mType = TYPE_COLOR_START_AND_COLOR_END;
mX0 = x0;
mY0 = y0;
mX1 = x1;
mY1 = y1;
mColor0 = color0;
mColor1 = color1;
mTileMode = tile;
init(nativeCreate2(x0, y0, x1, y1, color0, color1, tile.nativeInt));
}
/**
* @hide
*/
@Override
protected Shader copy() {
final LinearGradient copy;
switch (mType) {
case TYPE_COLORS_AND_POSITIONS:
copy = new LinearGradient(mX0, mY0, mX1, mY1, mColors.clone(),
mPositions != null ? mPositions.clone() : null, mTileMode);
break;
case TYPE_COLOR_START_AND_COLOR_END:
copy = new LinearGradient(mX0, mY0, mX1, mY1, mColor0, mColor1, mTileMode);
break;
default:
throw new IllegalArgumentException("LinearGradient should be created with either " +
"colors and positions or start color and end color");
}
copyLocalMatrix(copy);
return copy;
}
private native long nativeCreate1(float x0, float y0, float x1, float y1,
int colors[], float positions[], int tileMode);
private native long nativeCreate2(float x0, float y0, float x1, float y1,
int color0, int color1, int tileMode);
}
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