get Arrow Shape - Java java.lang

Java examples for java.lang:Math Geometry Shape

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Description

get Arrow Shape

Demo Code

/*/*  w w w  . j ava 2  s  . com*/
 * 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.java2s;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;

public class Main {
    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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