/*
* 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 {
/** 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");
}
native_instance = nativeCreate1(x0, y0, x1, y1, colors, positions, tile.nativeInt);
native_shader = nativePostCreate1(native_instance, 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) {
native_instance = nativeCreate2(x0, y0, x1, y1, color0, color1, tile.nativeInt);
native_shader = nativePostCreate2(native_instance, x0, y0, x1, y1, color0, color1,
tile.nativeInt);
}
private native int nativeCreate1(float x0, float y0, float x1, float y1,
int colors[], float positions[], int tileMode);
private native int nativeCreate2(float x0, float y0, float x1, float y1,
int color0, int color1, int tileMode);
private native int nativePostCreate1(int native_shader, float x0, float y0, float x1, float y1,
int colors[], float positions[], int tileMode);
private native int nativePostCreate2(int native_shader, float x0, float y0, float x1, float y1,
int color0, int color1, int tileMode);
}