Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2013 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.
 */

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

public class Main {
    private static final Dimension ARROW_HEAD_SIZE = new Dimension(18, 9);

    static void drawArrow(Graphics g1, int x1, int y1, int x2, int y2) {
        // x1 and y1 are coordinates of circle or rectangle
        // x2 and y2 are coordinates of circle or rectangle, to this point is directed the arrow
        Graphics2D g = (Graphics2D) g1.create();
        double dx = x2 - x1;
        double dy = y2 - y1;
        double angle = Math.atan2(dy, dx);
        int len = (int) Math.sqrt(dx * dx + dy * dy);
        AffineTransform t = AffineTransform.getTranslateInstance(x1, y1);
        t.concatenate(AffineTransform.getRotateInstance(angle));
        g.transform(t);
        g.drawLine(0, 0, len, 0);
        int basePosition = len - ARROW_HEAD_SIZE.width;
        int height = ARROW_HEAD_SIZE.height;
        g.fillPolygon(new int[] { len, basePosition, basePosition, len }, new int[] { 0, -height, height, 0 }, 4);
    }
}