Java Swing绘制箭头

绘制单向箭头、双向箭头

package com.xiangqian.swing;import javax.swing.*;
import java.awt.*;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;/*** 绘制箭头** @author xiangqian* @date 16:00 2019/10/31*/
public class DrawArrow {/*** 绘制面板** @author xiangqian* @date 15:38 2019/11/03*/public static class DrawPanel extends JPanel {private BasicStroke lineStroke;public DrawPanel() {lineStroke = new BasicStroke(2.0f);}@Overrideprotected void paintComponent(Graphics g) {draw((Graphics2D) g);}/*** 绘制** @param g2d*/private void draw(Graphics2D g2d) {Line2D.Double line2D = null;Arrow.Attributes arrowAttributes = null;// 绘制线的“方向1”箭头line2D = new Line2D.Double(120, 100, 300, 300);arrowAttributes = new Arrow.Attributes();drawLineArrowDirection1(g2d, arrowAttributes, line2D);// 绘制线的“方向2”箭头line2D = new Line2D.Double(110, 330, 300, 330);arrowAttributes = new Arrow.Attributes();arrowAttributes.angle = 45;arrowAttributes.height = 80;drawLineArrowDirection2(g2d, arrowAttributes, line2D);// 绘制线的“双向”箭头line2D = new Line2D.Double(500, 200, 260, 200);arrowAttributes = new Arrow.Attributes();arrowAttributes.angle = 30;arrowAttributes.height = 40;drawLineArrowDirectionAll(g2d, arrowAttributes, line2D);}/*** 绘制线的“方向1”箭头** @param g2d* @param arrowAttributes 箭头属性* @param line2D          线*/private void drawLineArrowDirection1(Graphics2D g2d, Arrow.Attributes arrowAttributes, Line2D.Double line2D) {drawLine(g2d, line2D);drawArrow(g2d, arrowAttributes, line2D.getP1(), line2D.getP2());}/*** 绘制线的“方向2”箭头** @param g2d* @param arrowAttributes 箭头属性* @param line2D          线*/private void drawLineArrowDirection2(Graphics2D g2d, Arrow.Attributes arrowAttributes, Line2D.Double line2D) {drawLine(g2d, line2D);drawArrow(g2d, arrowAttributes, line2D.getP2(), line2D.getP1());}/*** 绘制线的“双向”箭头** @param g2d* @param arrowAttributes 箭头属性* @param line2D          线*/private void drawLineArrowDirectionAll(Graphics2D g2d, Arrow.Attributes arrowAttributes, Line2D.Double line2D) {drawLine(g2d, line2D);drawArrow(g2d, arrowAttributes, line2D.getP1(), line2D.getP2());drawArrow(g2d, arrowAttributes, line2D.getP2(), line2D.getP1());}/*** 绘制线** @param g2d* @param line2D*/private void drawLine(Graphics2D g2d, Line2D.Double line2D) {g2d.setColor(Color.BLACK);g2d.setStroke(lineStroke);g2d.draw(line2D);}/*** 绘制箭头** @param g2d* @param arrowAttributes 箭头属性* @param point1          线的第一个点* @param point2          线的第二个点*/private void drawArrow(Graphics2D g2d, Arrow.Attributes arrowAttributes, Point2D point1, Point2D point2) {// 获取Arrow实例Arrow arrow = getArrow(arrowAttributes, point1, point2);// 构建GeneralPathGeneralPath arrow2D = new GeneralPath();arrow2D.moveTo(arrow.point1.x, arrow.point1.y);arrow2D.lineTo(arrow.point2.x, arrow.point2.y);arrow2D.lineTo(arrow.point3.x, arrow.point3.y);arrow2D.closePath();// 绘制g2d.setColor(arrow.attributes.color);g2d.fill(arrow2D);}/*** 获取箭头实体类** @param arrowAttributes 箭头属性* @param point1          线的第一个点* @param point2          线的第二个点* @return*/private Arrow getArrow(Arrow.Attributes arrowAttributes, Point2D point1, Point2D point2) {Arrow arrow = new Arrow(arrowAttributes);// 计算斜边double hypotenuse = arrow.attributes.height / Math.cos(Math.toRadians(arrow.attributes.angle / 2));// 计算当前线所在的象限int quadrant = -1;if (point1.getX() > point2.getX() && point1.getY() < point2.getY()) {quadrant = 1;} else if (point1.getX() < point2.getX() && point1.getY() < point2.getY()) {quadrant = 2;} else if (point1.getX() < point2.getX() && point1.getY() > point2.getY()) {quadrant = 3;} else if (point1.getX() > point2.getX() && point1.getY() > point2.getY()) {quadrant = 4;}// 计算线的夹角double linAngle = getLineAngle(point1.getX(), point1.getY(), point2.getX(), point2.getY());if (Double.isNaN(linAngle)) {// 线与x轴垂直if (point1.getX() == point2.getX()) {if (point1.getY() < point2.getY()) {linAngle = 90;} else {linAngle = 270;}quadrant = 2;}}// 线与y轴垂直else if (linAngle == 0) {if (point1.getY() == point2.getY()) {if (point1.getX() < point2.getX()) {linAngle = 0;} else {linAngle = 180;}quadrant = 2;}}// 上侧一半箭头double xAngle = linAngle - arrow.attributes.angle / 2; // 与x轴夹角double py0 = hypotenuse * Math.sin(Math.toRadians(xAngle)); // 计算y方向增量double px0 = hypotenuse * Math.cos(Math.toRadians(xAngle)); // 计算x方向增量// 下侧一半箭头double yAngle = 90 - linAngle - arrow.attributes.angle / 2; // 与y轴夹角double px1 = hypotenuse * Math.sin(Math.toRadians(yAngle));double py1 = hypotenuse * Math.cos(Math.toRadians(yAngle));// 第一象限if (quadrant == 1) {px0 = -px0;px1 = -px1;} else if (quadrant == 2) {// do nothing} else if (quadrant == 3) {py0 = -py0;py1 = -py1;} else if (quadrant == 4) {py0 = -py0;px0 = -px0;px1 = -px1;py1 = -py1;}// buildarrow.point1 = new Point2D.Double();arrow.point1.x = point1.getX();arrow.point1.y = point1.getY();arrow.point2 = new Point2D.Double();arrow.point2.x = point1.getX() + px0;arrow.point2.y = point1.getY() + py0;arrow.point3 = new Point2D.Double();arrow.point3.x = point1.getX() + px1;arrow.point3.y = point1.getY() + py1;return arrow;}/*** 获取线与X轴的夹角** @param x1* @param y1* @param x2* @param y2* @return*/protected double getLineAngle(double x1, double y1, double x2, double y2) {double k1 = (y2 - y1) / (x2 - x1);double k2 = 0;return Math.abs(Math.toDegrees(Math.atan((k2 - k1) / (1 + k1 * k2))));}}/*** 箭头实体类** @author xiangqian* @date 16:06 2019/10/31*/public static class Arrow {Attributes attributes;Point2D.Double point1;Point2D.Double point2;Point2D.Double point3;public Arrow(Attributes attributes) {this.attributes = attributes;}/*** 箭头属性** @author xiangqian* @date 15:41 2019/11/03*/public static class Attributes {double height; // 箭头的高度double angle; // 箭头角度Color color; // 箭头颜色public Attributes() {this.height = 60;this.angle = 30;this.color = Color.BLACK;}}}public static void main(String[] args) {JFrame frame = new JFrame();frame.setTitle("绘制箭头");Dimension dimension = new Dimension(800, 600);frame.setSize(dimension);frame.setLocationRelativeTo(null);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setContentPane(new DrawPanel());frame.setVisible(true);}}

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Java Swing绘制箭头

Java Swing绘制箭头

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