/*
* Copyright 2000-2015 JetBrains s.r.o.
*
* 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 com.intellij.util.ui;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.HashMap;
import java.util.Map;
/**
* Draws a 'apple-like' bold dotted line. Instances are cached for performance reasons.
* <p/>
* Each dot has this transparency core:
* | 20% | 50% | 20% | 0% |
* | 70% | 70% | 70% | 0% |
* | 50% | 100% | 50% | 0% |
* <p/>
* This class is not thread-safe, it's supposed to be used in EDT only.
*/
public class AppleBoldDottedPainter {
private static final int HEIGHT = 3;
private static final int WIDTH = 4;
private static final Map<Color, AppleBoldDottedPainter> myPainters = new HashMap<Color, AppleBoldDottedPainter>();
private static final int PATTERN_WIDTH = 4000;
private final BufferedImage myImage;
@SuppressWarnings("PointlessArithmeticExpression")
private AppleBoldDottedPainter(Color color) {
myImage = UIUtil.createImage(PATTERN_WIDTH, HEIGHT, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = myImage.createGraphics();
try {
g.setColor(color);
for (int i = 0; i < PATTERN_WIDTH / WIDTH + 1; i++) {
int offset = i * WIDTH;
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, .2f));
g.drawLine(offset + 0, 0, offset + 0, 0);
g.drawLine(offset + 2, 0, offset + 2, 0);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 0.7f));
g.drawLine(offset + 0, 1, offset + 2, 1);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 1.0f));
g.drawLine(offset + 1, 2, offset + 1, 2);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, .5f));
g.drawLine(offset + 1, 0, offset + 1, 0);
g.drawLine(offset + 0, 2, offset + 0, 2);
g.drawLine(offset + 2, 2, offset + 2, 2);
}
}
finally {
g.dispose();
}
}
public void paint(Graphics2D g, int xStart, int xEnd, int y) {
Shape oldClip = g.getClip();
final int startPosCorrection = xStart % WIDTH == WIDTH - 1 ? 1 : 0;
final int dotX0 = (xStart / WIDTH + startPosCorrection) * WIDTH; // draw lines in common phase
final int width = ((xEnd - dotX0 - 1) / WIDTH + 1) * WIDTH; // always paint whole dot
final Rectangle rectangle = new Rectangle(dotX0, y, width, HEIGHT);
final Rectangle lineClip = oldClip != null ? oldClip.getBounds().intersection(rectangle) : rectangle;
if (lineClip.isEmpty()) return;
Composite oldComposite = g.getComposite();
try {
g.setComposite(AlphaComposite.SrcOver);
g.setClip(lineClip);
UIUtil.drawImage(g, myImage, dotX0, y, null);
}
finally {
g.setComposite(oldComposite);
g.setClip(oldClip);
}
}
public static AppleBoldDottedPainter forColor(Color color) {
AppleBoldDottedPainter painter = myPainters.get(color);
if (painter == null) {
painter = new AppleBoldDottedPainter(color);
// creating a new Color instance, as the one passed as parameter can be mutable (JBColor) and shouldn't be used as a map key
//noinspection UseJBColor
myPainters.put(new Color(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha()), painter);
}
return painter;
}
}