Here you can find the source of drawArrow(Graphics2D g2d, int xCenter, int yCenter, int x, int y, float stroke)
| Parameter | Description |
|---|---|
| g2d | An object of type Graphics2D. It is the graph on which arrows are pictured. |
| xCenter | It is the x coordinate of the first point from the center. |
| yCenter | It is the y coordinate of the second point from the center. |
| x | It is the x coordinate of the first point. |
| y | It is the y coordinate of the second point. |
| stroke | It is the stroke of the arrow. |
public static void drawArrow(Graphics2D g2d, int xCenter, int yCenter, int x, int y, float stroke)
//package com.java2s; /*/*from ww w .j ava 2 s .c o m*/ * Rainbow - A simulator of processes and resources in a multitasking computer. * Copyright (C) 2006. E-mail: piero.dallepezze@gmail.com * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * * File: gpfxUtilsRainbow.java * Package: gui.gpfxRepository * Author: Sarto Carlo, Dalle Pezze Piero * Date: 10/02/2006 * Version: 1.2 * * Modifies: * - v.1.2 (16/04/2007): English translation. Java6 compatible. (Piero Dalle Pezze) * - v.1.1 (16/02/2006): Documentation. Sarto Carlo. * - v.1.0 (10/02/2006): Codify. Sarto Carlo. * */ import java.awt.*; public class Main { /** * It defines functionality to draw arrows, by using colors and coordinates. * * @param g2d * An object of type Graphics2D. It is the graph on which arrows * are pictured. * @param xCenter * It is the x coordinate of the first point from the center. * @param yCenter * It is the y coordinate of the second point from the center. * @param x * It is the x coordinate of the first point. * @param y * It is the y coordinate of the second point. * @param stroke * It is the stroke of the arrow. */ public static void drawArrow(Graphics2D g2d, int xCenter, int yCenter, int x, int y, float stroke) { double aDir = Math.atan2(xCenter - x, yCenter - y); g2d.drawLine(x, y, xCenter, yCenter); g2d.setStroke(new BasicStroke(1f)); // it makes the arrow head solid even if dash pattern has been specified Polygon tmpPoly = new Polygon(); int i1 = 12 + (int) (stroke * 2); int i2 = 6 + (int) stroke; // it makes the arrow head the same size regardless of the length length // arrow tip tmpPoly.addPoint(x, y); tmpPoly.addPoint(x + xCor(i1, aDir + .3), y + yCor(i1, aDir + .3)); tmpPoly.addPoint(x + xCor(i2, aDir), y + yCor(i2, aDir)); tmpPoly.addPoint(x + xCor(i1, aDir - .3), y + yCor(i1, aDir - .3)); // arrow tip tmpPoly.addPoint(x, y); g2d.drawPolygon(tmpPoly); // it removes this line to leave arrow head unpainted g2d.fillPolygon(tmpPoly); } private static int xCor(int len, double dir) { return (int) (len * Math.sin(dir)); } private static int yCor(int len, double dir) { return (int) (len * Math.cos(dir)); } }