94 lines
2.5 KiB
Java
94 lines
2.5 KiB
Java
import java.awt.*;
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import javax.swing.*;
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public class Bresenham extends JFrame {
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public static void main(String[] args) {
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SwingUtilities.invokeLater(new Runnable() {
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@Override
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public void run() {
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JFrame f = new Bresenham();
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f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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f.setVisible(true);
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f.add(new BresenhamPanel(), BorderLayout.CENTER);
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f.setTitle("Bresenham");
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f.setResizable(false);
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f.pack();
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f.setLocationRelativeTo(null);
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}
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});
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}
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}
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class BresenhamPanel extends JPanel {
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final int centerX, centerY;
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public BresenhamPanel() {
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int w = 600;
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int h = 500;
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centerX = w / 2;
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centerY = h / 2;
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setPreferredSize(new Dimension(w, h));
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setBackground(Color.white);
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}
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@Override
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public void paintComponent(Graphics g) {
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super.paintComponent(g);
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drawLine(g, 0, 0, 8, 19); // NNE
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drawLine(g, 0, 0, 19, 8); // ENE
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drawLine(g, 0, 0, 19, -8); // ESE
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drawLine(g, 0, 0, 8, -19); // SSE
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drawLine(g, 0, 0, -8, -19); // SSW
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drawLine(g, 0, 0, -19, -8); // WSW
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drawLine(g, 0, 0, -19, 8); // WNW
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drawLine(g, 0, 0, -8, 19); // NNW
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}
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private void plot(Graphics g, int x, int y) {
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g.setColor(Color.black);
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g.drawOval(centerX + (x * 10), centerY + (-y * 10), 10, 10);
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}
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private void drawLine(Graphics g, int x1, int y1, int x2, int y2) {
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// delta of exact value and rounded value of the dependant variable
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int d = 0;
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int dy = Math.abs(y2 - y1);
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int dx = Math.abs(x2 - x1);
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int dy2 = (dy << 1); // slope scaling factors to avoid floating
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int dx2 = (dx << 1); // point
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int ix = x1 < x2 ? 1 : -1; // increment direction
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int iy = y1 < y2 ? 1 : -1;
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if (dy <= dx) {
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for (;;) {
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plot(g, x1, y1);
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if (x1 == x2)
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break;
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x1 += ix;
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d += dy2;
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if (d > dx) {
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y1 += iy;
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d -= dx2;
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}
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}
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} else {
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for (;;) {
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plot(g, x1, y1);
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if (y1 == y2)
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break;
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y1 += iy;
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d += dx2;
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if (d > dy) {
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x1 += ix;
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d -= dy2;
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}
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}
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}
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}
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}
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