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Bitmap/Bresenham's line algorithm: Difference between revisions
→{{header|Java}}: added Java
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viewRGB myimg=: (Square;0 0 255) drawLines myimg NB. draw 4 blue lines to form a square
viewRGB (Diamond;255 0 0) drawLines (Square;0 0 255) drawLines myimg</lang>
=={{header|Java}}==
<lang java>import java.awt.*;
import javax.swing.*;
public class Bresenham extends JFrame {
BresenhamPanel panel;
public static void main(String[] args) {
JFrame f = new Bresenham();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
public Bresenham() {
Container content = getContentPane();
content.setLayout(new BorderLayout());
panel = new BresenhamPanel();
content.add(panel, BorderLayout.CENTER);
setTitle("Bresenham");
pack();
setLocationRelativeTo(null);
}
}
class BresenhamPanel extends JPanel {
final int w, h, centerX, centerY;
public BresenhamPanel() {
w = 600;
h = 500;
centerX = w / 2;
centerY = h / 2;
setPreferredSize(new Dimension(w, h));
setForeground(Color.black);
setBackground(Color.white);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
drawLine(g, 0, 0, 8, 19); // NNE
drawLine(g, 0, 0, 19, 8); // ENE
drawLine(g, 0, 0, 19, -8); // ESE
drawLine(g, 0, 0, 8, -19); // SSE
drawLine(g, 0, 0, -8, -19); // SSW
drawLine(g, 0, 0, -19, -8); // WSW
drawLine(g, 0, 0, -19, 8); // WNW
drawLine(g, 0, 0, -8, 19); // NNW
}
private void plot(Graphics g, int x, int y) {
g.setColor(Color.black);
g.drawOval(centerX + (x * 10), centerY + (-y * 10), 10, 10);
}
private void drawLine(Graphics g, int x1, int y1, int x2, int y2) {
// delta of exact value and rounded value of the dependant variable
int d = 0;
int dy = Math.abs(y2 - y1);
int dx = Math.abs(x2 - x1);
int dy2 = (dy << 1); // slope scaling factors to avoid floating
int dx2 = (dx << 1); // point
int ix = x1 < x2 ? 1 : -1; // increment direction
int iy = y1 < y2 ? 1 : -1;
if (dy <= dx) {
for (;;) {
plot(g, x1, y1);
if (x1 == x2)
break;
x1 += ix;
d += dy2;
if (d > dx) {
y1 += iy;
d -= dx2;
}
}
} else {
for (;;) {
plot(g, x1, y1);
if (y1 == y2)
break;
y1 += iy;
d += dx2;
if (d > dy) {
x1 += ix;
d -= dy2;
}
}
}
}
}</lang>
=={{header|JavaScript}}==
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