AlgoFrame.java

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

public class AlgoFrame extends JFrame {


    private int canvasWidth;
    private int canvasHeight;

    public AlgoFrame(String title, int canvasWidth, int canvasHeight) {
        super(title);

        this.canvasWidth = canvasWidth;
        this.canvasHeight = canvasHeight;

        AlgoCanvas canvas = new AlgoCanvas();
        setContentPane(canvas);
        pack();

        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setVisible(true);
    }

    public AlgoFrame(String title) {
        this(title, 1024, 728);
    }

    private Circle[] circles;

    public void render(Circle[] circles) {
        this.circles = circles;
        repaint();
    }


    private class AlgoCanvas extends JPanel {
        public AlgoCanvas() {
            super(true);
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);

//            g.drawOval(50, 50, 300, 300);

            Graphics2D g2d = (Graphics2D) g;
            // 抗锯齿
            RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
                    RenderingHints.VALUE_ANTIALIAS_ON);

            g2d.addRenderingHints(hints);


            // 具体绘制
            AlgoVisHelper.setStrokeWidth(g2d, 1);
            AlgoVisHelper.setColor(g2d, Color.RED);
            for (Circle circle : circles) {
                if (!circle.isFilled)
                    AlgoVisHelper.strokeCircle(g2d, circle.x, circle.y, circle.getR());
                else
                    AlgoVisHelper.fillCircle(g2d, circle.x, circle.y, circle.getR());
            }
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(canvasWidth, canvasHeight);
        }

    }

    public int getCanvasWidth() {
        return canvasWidth;
    }

    public void setCanvasWidth(int canvasWidth) {
        this.canvasWidth = canvasWidth;
    }

    public int getCanvasHeight() {
        return canvasHeight;
    }

    public void setCanvasHeight(int canvasHeight) {
        this.canvasHeight = canvasHeight;
    }

}