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BAEL-9443 Draw a circle in different ways #18912

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83 changes: 83 additions & 0 deletions image-processing/src/main/java/com/baeldung/drawcircle/DrawBufferedCircle.java
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package com.baeldung.drawcircle;

import javax.swing.*;
import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;

public class DrawBufferedCircle {

public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame("Circle");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new CircleImagePanel(64, 3)); // final size: 64x64, supersample: 3x
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}

static class CircleImagePanel extends JPanel {
private final int finalSize;
private final BufferedImage circleImage;

public CircleImagePanel(int finalSize, int scale) {
this.finalSize = finalSize;
this.circleImage = makeCircleImage(finalSize, scale);
setPreferredSize(new Dimension(finalSize + 16, finalSize + 16));
setBackground(Color.WHITE);
}

@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
try {
int x = (getWidth() - finalSize) / 2;
int y = (getHeight() - finalSize) / 2;

g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);

g2.drawImage(circleImage, x, y, finalSize, finalSize, null);
} finally {
g2.dispose();
}
}

private BufferedImage makeCircleImage(int finalSize, int scale) {
int hi = finalSize * scale;
BufferedImage img = new BufferedImage(hi, hi, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
try {
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL,
RenderingHints.VALUE_STROKE_PURE);

g2.setComposite(AlphaComposite.Src);

float stroke = 6f * scale / 3f;
double diameter = hi - stroke - (4 * scale);
double x = (hi - diameter) / 2.0;
double y = (hi - diameter) / 2.0;

Shape circle = new Ellipse2D.Double(x, y, diameter, diameter);

g2.setPaint(new Color(0xBBDEFB));
g2.fill(circle);

g2.setPaint(new Color(0x0D47A1));
g2.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
g2.draw(circle);

} finally {
g2.dispose();
}
return img;
}
}
}
46 changes: 46 additions & 0 deletions image-processing/src/main/java/com/baeldung/drawcircle/DrawCircle.java
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package com.baeldung.drawcircle;

import java.awt.*;
import java.awt.geom.Ellipse2D;
import javax.swing.*;

public class DrawCircle extends JPanel {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);

Graphics2D g2 = (Graphics2D) g.create();
try {
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

float stroke = 2f;
double diameter = Math.min(getWidth(), getHeight()) - 12; // padding
double x = (getWidth() - diameter) / 2.0;
double y = (getHeight() - diameter) / 2.0;

Ellipse2D circle = new Ellipse2D.Double(x, y, diameter, diameter);

g2.setColor(new Color(0xBBDEFB));
g2.fill(circle);

g2.setColor(new Color(0x0D47A1));
g2.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
g2.draw(circle);
} finally {
g2.dispose();
}
}

public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame("Circle");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new DrawCircle());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}
75 changes: 75 additions & 0 deletions image-processing/src/main/java/com/baeldung/drawcircle/DrawSupersampledCircle.java
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package com.baeldung.drawcircle;

import javax.swing.*;
import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;

public class DrawSupersampledCircle {

public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame("SupersampledCircle");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new CirclePanel());
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}

static class CirclePanel extends JPanel {
private final BufferedImage hiResImage;
private final int finalSize = 6;

public CirclePanel() {
int scale = 3;
float stroke = 6f;

hiResImage = makeSupersampledCircle(scale, stroke);
setPreferredSize(new Dimension(finalSize + 32, finalSize + 32));
setBackground(Color.WHITE);
}

@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
try {
int x = (getWidth() - finalSize) / 2;
int y = (getHeight() - finalSize) / 2;

g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);

g2.drawImage(hiResImage, x, y, finalSize, finalSize, null);
} finally {
g2.dispose();
}
}

private BufferedImage makeSupersampledCircle(int scale, float stroke) {
int hi = finalSize * scale;
BufferedImage img = new BufferedImage(hi, hi, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
try {
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

double d = hi - stroke;
Shape circle = new Ellipse2D.Double(stroke / 2.0, stroke / 2.0, d, d);

g2.setPaint(new Color(0xBBDEFB));
g2.fill(circle);

g2.setPaint(new Color(0x0D47A1));
g2.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
g2.draw(circle);
} finally {
g2.dispose();
}
return img;
}
}
}