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June 2018 Update

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Ingy döt Net 2018-06-22 20:57:24 +00:00
parent ba8067c3b7
commit 22f33d4004
5278 changed files with 84726 additions and 14379 deletions
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118
Task/Bitmap-Bresenhams-line-algorithm/Java/bitmap-bresenhams-line-algorithm.java
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@ -1,90 +1,112 @@
import java.awt.*;
import javax.swing.*;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
public class Bresenham extends JFrame {
public class Bresenham {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new Bresenham();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
f.add(new BresenhamPanel(), BorderLayout.CENTER);
f.setTitle("Bresenham");
f.setResizable(false);
f.pack();
f.setLocationRelativeTo(null);
}
});
SwingUtilities.invokeLater(Bresenham::run);
}
private static void run() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
f.setTitle("Bresenham");
f.getContentPane().add(new BresenhamPanel());
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class BresenhamPanel extends JPanel {
final int centerX, centerY;
public BresenhamPanel() {
int w = 600;
int h = 500;
centerX = w / 2;
centerY = h / 2;
setPreferredSize(new Dimension(w, h));
setBackground(Color.white);
private final int pixelSize = 10;
BresenhamPanel() {
setPreferredSize(new Dimension(600, 500));
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
int w = (getWidth() - 1) / pixelSize;
int h = (getHeight() - 1) / pixelSize;
int maxX = (w - 1) / 2;
int maxY = (h - 1) / 2;
int x1 = -maxX, x2 = maxX * -2 / 3, x3 = maxX * 2 / 3, x4 = maxX;
int y1 = -maxY, y2 = maxY * -2 / 3, y3 = maxY * 2 / 3, y4 = maxY;
drawLine(g, 0, 0, x3, y1); // NNE
drawLine(g, 0, 0, x4, y2); // ENE
drawLine(g, 0, 0, x4, y3); // ESE
drawLine(g, 0, 0, x3, y4); // SSE
drawLine(g, 0, 0, x2, y4); // SSW
drawLine(g, 0, 0, x1, y3); // WSW
drawLine(g, 0, 0, x1, y2); // WNW
drawLine(g, 0, 0, x2, y1); // NNW
}
private void plot(Graphics g, int x, int y) {
int w = (getWidth() - 1) / pixelSize;
int h = (getHeight() - 1) / pixelSize;
int maxX = (w - 1) / 2;
int maxY = (h - 1) / 2;
int borderX = getWidth() - ((2 * maxX + 1) * pixelSize + 1);
int borderY = getHeight() - ((2 * maxY + 1) * pixelSize + 1);
int left = (x + maxX) * pixelSize + borderX / 2;
int top = (y + maxY) * pixelSize + borderY / 2;
g.setColor(Color.black);
g.drawOval(centerX + (x * 10), centerY + (-y * 10), 10, 10);
g.drawOval(left, top, pixelSize, pixelSize);
}
private void drawLine(Graphics g, int x1, int y1, int x2, int y2) {
// delta of exact value and rounded value of the dependant variable
// delta of exact value and rounded value of the dependent variable
int d = 0;
int dy = Math.abs(y2 - y1);
int dx = Math.abs(x2 - x1);
int dy = Math.abs(y2 - y1);
int dy2 = (dy << 1); // slope scaling factors to avoid floating
int dx2 = (dx << 1); // point
int dx2 = 2 * dx; // slope scaling factors to
int dy2 = 2 * dy; // avoid floating 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)
int x = x1;
int y = y1;
if (dx >= dy) {
while (true) {
plot(g, x, y);
if (x == x2)
break;
x1 += ix;
x += ix;
d += dy2;
if (d > dx) {
y1 += iy;
y += iy;
d -= dx2;
}
}
} else {
for (;;) {
plot(g, x1, y1);
if (y1 == y2)
while (true) {
plot(g, x, y);
if (y == y2)
break;
y1 += iy;
y += iy;
d += dx2;
if (d > dy) {
x1 += ix;
x += ix;
d -= dy2;
}
}