/*
* 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;
import android.annotation.NonNull;
import android.annotation.Nullable;
public class RadialGradient extends Shader {
private static final int TYPE_COLORS_AND_POSITIONS = 1;
private static final int TYPE_COLOR_CENTER_AND_COLOR_EDGE = 2;
/**
* Type of the RadialGradient: can be either TYPE_COLORS_AND_POSITIONS or
* TYPE_COLOR_CENTER_AND_COLOR_EDGE.
*/
private int mType;
private float mX;
private float mY;
private float mRadius;
private int[] mColors;
private float[] mPositions;
private int mCenterColor;
private int mEdgeColor;
private TileMode mTileMode;
/** Create a shader that draws a radial gradient given the center and radius.
@param centerX The x-coordinate of the center of the radius
@param centerY The y-coordinate of the center of the radius
@param radius Must be positive. The radius of the circle for this gradient.
@param colors The colors to be distributed between the center and edge of the circle
@param stops May be <code>null</code>. Valid values are between <code>0.0f</code> and
<code>1.0f</code>. The relative position of each corresponding color in
the colors array. If <code>null</code>, colors are distributed evenly
between the center and edge of the circle.
@param tileMode The Shader tiling mode
*/
public RadialGradient(float centerX, float centerY, float radius,
@NonNull int colors[], @Nullable float stops[], @NonNull TileMode tileMode) {
if (radius <= 0) {
throw new IllegalArgumentException("radius must be > 0");
}
if (colors.length < 2) {
throw new IllegalArgumentException("needs >= 2 number of colors");
}
if (stops != null && colors.length != stops.length) {
throw new IllegalArgumentException("color and position arrays must be of equal length");
}
mType = TYPE_COLORS_AND_POSITIONS;
mX = centerX;
mY = centerY;
mRadius = radius;
mColors = colors;
mPositions = stops;
mTileMode = tileMode;
init(nativeCreate1(centerX, centerY, radius, colors, stops, tileMode.nativeInt));
}
/** Create a shader that draws a radial gradient given the center and radius.
@param centerX The x-coordinate of the center of the radius
@param centerY The y-coordinate of the center of the radius
@param radius Must be positive. The radius of the circle for this gradient
@param centerColor The color at the center of the circle.
@param edgeColor The color at the edge of the circle.
@param tileMode The Shader tiling mode
*/
public RadialGradient(float centerX, float centerY, float radius,
int centerColor, int edgeColor, @NonNull TileMode tileMode) {
if (radius <= 0) {
throw new IllegalArgumentException("radius must be > 0");
}
mType = TYPE_COLOR_CENTER_AND_COLOR_EDGE;
mX = centerX;
mY = centerY;
mRadius = radius;
mCenterColor = centerColor;
mEdgeColor = edgeColor;
mTileMode = tileMode;
init(nativeCreate2(centerX, centerY, radius, centerColor, edgeColor, tileMode.nativeInt));
}
/**
* @hide
*/
@Override
protected Shader copy() {
final RadialGradient copy;
switch (mType) {
case TYPE_COLORS_AND_POSITIONS:
copy = new RadialGradient(mX, mY, mRadius, mColors.clone(),
mPositions != null ? mPositions.clone() : null, mTileMode);
break;
case TYPE_COLOR_CENTER_AND_COLOR_EDGE:
copy = new RadialGradient(mX, mY, mRadius, mCenterColor, mEdgeColor, mTileMode);
break;
default:
throw new IllegalArgumentException("RadialGradient should be created with either " +
"colors and positions or center color and edge color");
}
copyLocalMatrix(copy);
return copy;
}
private static native long nativeCreate1(float x, float y, float radius,
int colors[], float positions[], int tileMode);
private static native long nativeCreate2(float x, float y, float radius,
int color0, int color1, int tileMode);
}