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JavaExercises/Experiments/Arrows.java at master · biblelamp/JavaExercises · GitHub

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import java.awt.*;

import java.awt.geom.*;

import javax.swing.*;

public class Arrows

{

public static void main(String[] args)

{

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(new ArrowPanel());

f.setSize(500,400);

f.setLocation(200,200);

f.setVisible(true);

}

}

class ArrowPanel extends JPanel

{

int barb;

double phi;

public ArrowPanel()

{

barb = 20; // barb length

phi = Math.PI/6; // 30 degrees barb angle

setBackground(Color.white);

}

protected void paintComponent(Graphics g)

{

super.paintComponent(g);

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

int w = getWidth();

int h = getHeight();

double theta, x, y;

g2.setPaint(Color.blue);

double x1 = w*3/24, y1 = h*3/32, x2 = w*11/24, y2 = y1;

g2.draw(new Line2D.Double(x1, y1, x2, y2));

// draw this arrow head at point x2, y2 and measure

// angle theta relative to same point, ie, y2 - and x2 -

theta = Math.atan2(y2 - y1, x2 - x1);

drawArrow(g2, theta, x2, y2);

x1 = w*3/8; y1 = h*13/15; x2 = w*2/3; y2 = y1;

g2.draw(new Line2D.Double(x1, y1, x2, y2));

theta = Math.atan2(y1 - y2, x1 - x2);

drawArrow(g2, theta, x1, y1);

g2.setPaint(Color.red);

x1 = w*3/24; y1 = h*4/32; x2 = x1; y2 = h*18/32;

g2.draw(new Line2D.Double(x1, y1, x2, y2));

theta = Math.atan2(y2 - y1, x2 - x1);

drawArrow(g2, theta, x2, y2);

g2.setPaint(Color.orange);

x1 = w*5/32; y1 = h*27/32; x2 = w*27/32; y2 = h*5/32;

g2.draw(new Line2D.Double(x1, y1, x2, y2));

theta = Math.atan2(y2 - y1, x2 - x1);

drawArrow(g2, theta, x2, y2);

g2.setPaint(Color.green.darker());

x1 = w/2; y1 = h/2; x2 = w*27/32; y2 = h*27/32;

g2.draw(new Line2D.Double(x1, y1, x2, y2));

theta = Math.atan2(y2 - y1, x2 - x1);

drawArrow(g2, theta, x2, y2);

}

private void drawArrow(Graphics2D g2, double theta, double x0, double y0)

{

double x = x0 - barb * Math.cos(theta + phi);

double y = y0 - barb * Math.sin(theta + phi);

g2.draw(new Line2D.Double(x0, y0, x, y));

x = x0 - barb * Math.cos(theta - phi);

y = y0 - barb * Math.sin(theta - phi);

g2.draw(new Line2D.Double(x0, y0, x, y));

}

}

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