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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;
import android.annotation.ColorInt;
import android.annotation.NonNull;
import android.annotation.Nullable;
public class SweepGradient 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 mCx;
private float mCy;
private int[] mColors;
private float[] mPositions;
private int mColor0;
private int mColor1;
/**
* A Shader that draws a sweep gradient around a center point.
*
* @param cx The x-coordinate of the center
* @param cy The y-coordinate of the center
* @param colors The colors to be distributed between around the center.
* There must be at least 2 colors in the array.
* @param positions May be NULL. The relative position of
* each corresponding color in the colors array, beginning
* with 0 and ending with 1.0. If the values are not
* monotonic, the drawing may produce unexpected results.
* If positions is NULL, then the colors are automatically
* spaced evenly.
*/
public SweepGradient(float cx, float cy,
@NonNull @ColorInt int colors[], @Nullable float positions[]) {
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;
mCx = cx;
mCy = cy;
mColors = colors.clone();
mPositions = positions != null ? positions.clone() : null;
}
/**
* A Shader that draws a sweep gradient around a center point.
*
* @param cx The x-coordinate of the center
* @param cy The y-coordinate of the center
* @param color0 The color to use at the start of the sweep
* @param color1 The color to use at the end of the sweep
*/
public SweepGradient(float cx, float cy, @ColorInt int color0, @ColorInt int color1) {
mType = TYPE_COLOR_START_AND_COLOR_END;
mCx = cx;
mCy = cy;
mColor0 = color0;
mColor1 = color1;
mColors = null;
mPositions = null;
}
@Override
long createNativeInstance(long nativeMatrix) {
if (mType == TYPE_COLORS_AND_POSITIONS) {
return nativeCreate1(nativeMatrix, mCx, mCy, mColors, mPositions);
} else { // TYPE_COLOR_START_AND_COLOR_END
return nativeCreate2(nativeMatrix, mCx, mCy, mColor0, mColor1);
}
}
/**
* @hide
*/
@Override
protected Shader copy() {
final SweepGradient copy;
if (mType == TYPE_COLORS_AND_POSITIONS) {
copy = new SweepGradient(mCx, mCy, mColors.clone(),
mPositions != null ? mPositions.clone() : null);
} else { // TYPE_COLOR_START_AND_COLOR_END
copy = new SweepGradient(mCx, mCy, mColor0, mColor1);
}
copyLocalMatrix(copy);
return copy;
}
private static native long nativeCreate1(long matrix, float x, float y,
int colors[], float positions[]);
private static native long nativeCreate2(long matrix, float x, float y,
int color0, int color1);
}
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