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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* 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.ColorLong;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.compat.annotation.UnsupportedAppUsage;
import android.os.Build;
public class SweepGradient extends Shader {
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
private float mCx;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
private float mCy;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
private float[] mPositions;
// @ColorInts are replaced by @ColorLongs, but these remain due to @UnsupportedAppUsage.
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
@ColorInt
private int[] mColors;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
@ColorInt
private int mColor0;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
@ColorInt
private int mColor1;
@ColorLong
private final long[] mColorLongs;
/**
* 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 sRGB 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) {
this(cx, cy, convertColors(colors), positions, ColorSpace.get(ColorSpace.Named.SRGB));
}
/**
* 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.
* @throws IllegalArgumentException if there are less than two colors, the colors do
* not share the same {@link ColorSpace} or do not use a valid one, or {@code positions}
* is not {@code null} and has a different length from {@code colors}.
*/
public SweepGradient(float cx, float cy, @NonNull @ColorLong long[] colors,
@Nullable float[] positions) {
this(cx, cy, colors.clone(), positions, detectColorSpace(colors));
}
/**
* Base constructor. Assumes @param colors is a copy that this object can hold onto,
* and all colors share @param colorSpace.
*/
private SweepGradient(float cx, float cy, @NonNull @ColorLong long[] colors,
@Nullable float[] positions, ColorSpace colorSpace) {
super(colorSpace);
if (positions != null && colors.length != positions.length) {
throw new IllegalArgumentException(
"color and position arrays must be of equal length");
}
mCx = cx;
mCy = cy;
mColorLongs = colors;
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 sRGB color to use at the start of the sweep
* @param color1 The sRGB color to use at the end of the sweep
*/
public SweepGradient(float cx, float cy, @ColorInt int color0, @ColorInt int color1) {
this(cx, cy, Color.pack(color0), Color.pack(color1));
}
/**
* 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
*
* @throws IllegalArgumentException if the colors do
* not share the same {@link ColorSpace} or do not use a valid one.
*/
public SweepGradient(float cx, float cy, @ColorLong long color0, @ColorLong long color1) {
this(cx, cy, new long[] {color0, color1}, null);
}
/** @hide */
@Override
protected long createNativeInstance(long nativeMatrix, boolean filterFromPaint) {
return nativeCreate(nativeMatrix, mCx, mCy, mColorLongs, mPositions,
colorSpace().getNativeInstance());
}
private static native long nativeCreate(long matrix, float x, float y,
long[] colors, float[] positions, long colorSpaceHandle);
}