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/*
* Copyright (c) 2012, Codename One and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Codename One designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.ui;
import static com.codename1.ui.MultipleGradientPaint.CycleMethod.REFLECT;
import com.codename1.ui.geom.Rectangle2D;
import com.codename1.ui.geom.Shape;
import com.codename1.util.MathUtil;
/**
* LinearGradientPaint provides a way to fill a {@link Shape} with a linear gradient.
* @author shannah
* @since 7.0
* @see Graphics#setColor(com.codename1.ui.Paint)
*/
public class LinearGradientPaint extends MultipleGradientPaint {
private double startX, startY, endX, endY;
private Transform t = Transform.makeIdentity(), t2 = Transform.makeIdentity();
/**
* Creates a LinearGradientPaint with the specified settings.
* @param startX The startX coordinate of the gradient in user space.
* @param startY The startY coordinate of the gradient in user space.
* @param endX The endX coordinate of the gradient in user space.
* @param endY THe endY coordinate of the gradient in user space.
* @param fractions Fractional positions of where gradient colors begin. Each value should be between 0 and 1.
* @param colors The colors to use in the gradient. There should be the same number of colors as there are fractions.
* @param cycleMethod The cycle method to use.
* @param colorSpace The color space to use.
* @param gradientTransform Transform to use for the gradient. Not used right now.
*/
public LinearGradientPaint(float startX, float startY, float endX, float endY, float[] fractions, int[] colors, MultipleGradientPaint.CycleMethod cycleMethod, MultipleGradientPaint.ColorSpaceType colorSpace, Transform gradientTransform) {
super(fractions, colors, cycleMethod, colorSpace, gradientTransform);
this.startX = startX;
this.startY = startY;
this.endX = endX;
this.endY = endY;
}
/**
* Creates a LinearGradientPaint with the specified settings.
* @param startX The startX coordinate of the gradient in user space.
* @param startY The startY coordinate of the gradient in user space.
* @param endX The endX coordinate of the gradient in user space.
* @param endY THe endY coordinate of the gradient in user space.
* @param fractions Fractional positions of where gradient colors begin. Each value should be between 0 and 1.
* @param colors The colors to use in the gradient. There should be the same number of colors as there are fractions.
* @param cycleMethod The cycle method to use.
* @param colorSpace The color space to use.
* @param gradientTransform Transform to use for the gradient. Not used right now.
*/
public LinearGradientPaint(double startX, double startY, double endX, double endY, float[] fractions, int[] colors, MultipleGradientPaint.CycleMethod cycleMethod, MultipleGradientPaint.ColorSpaceType colorSpace, Transform gradientTransform) {
super(fractions, colors, cycleMethod, colorSpace, gradientTransform);
this.startX = startX;
this.startY = startY;
this.endX = endX;
this.endY = endY;
}
/**
* Paints linear gradient in the given bounds.
* @param g
* @param bounds
*/
@Override
public final void paint(Graphics g, Rectangle2D bounds) {
paint(g, bounds.getX(), bounds.getY(), bounds.getWidth(), bounds.getHeight());
}
private double insetStartLength(double x, double y, double w, double h) {
return Math.max(w, h);
}
private double insetEndLength(double x, double y, double w, double h) {
return Math.max(w, h);
}
private double length() {
double x = endX-startX;
double y = endY-startY;
return Math.sqrt(x*x+y*y);
}
private double theta() {
if (length() == 0) {
return 0;
}
return thetaDirection() * MathUtil.acos((endX-startX)/length());
}
private int thetaDirection() {
if (endY >= startY) {
return 1;
} else {
return -1;
}
}
private int[] reverseColors() {
int[] colors = getColors();
int len = colors.length;
int[] out = new int[len];
for (int i=0; i
