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/*
* Copyright 2000-2009 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.ui;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
public class LineEndDecorator {
private static final int myArrowSize = 9;
private static final Shape myArrowPolygon = new Polygon(new int[] {0, myArrowSize, 0, 0}, new int[] {0, myArrowSize /2, myArrowSize, 0}, 4);
public static Shape getArrowShape(Line2D line, Point2D intersectionPoint) {
final double deltaY = line.getP2().getY() - line.getP1().getY();
final double length = Math.sqrt(Math.pow(deltaY, 2) + Math.pow(line.getP2().getX() - line.getP1().getX(), 2));
double theta = Math.asin(deltaY / length);
if (line.getP1().getX() > line.getP2().getX()) {
theta = Math.PI - theta;
}
AffineTransform rotate = AffineTransform.getRotateInstance(theta, myArrowSize, myArrowSize / 2);
Shape polygon = rotate.createTransformedShape(myArrowPolygon);
AffineTransform move = AffineTransform.getTranslateInstance(intersectionPoint.getX() - myArrowSize, intersectionPoint.getY() - myArrowSize /2);
polygon = move.createTransformedShape(polygon);
return polygon;
}
}
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