AlgoFrame.java

import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.geom.Ellipse2D;
import java.awt.RenderingHints;
import java.awt.BasicStroke;

import javax.swing.JFrame;
import javax.swing.JPanel;

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();

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

        setVisible(true);
    }

    public AlgoFrame(String title){

        this(title, 1024, 768);
    }

    public int getCanvasWidth(){return canvasWidth;}
    public int getCanvasHeight(){return canvasHeight;}

    private class AlgoCanvas extends JPanel{

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

            Graphics2D g2d = (Graphics2D)g;

            // 具体绘制
            AlgoVisHelper.setColor(g2d, Color.BLUE);
            AlgoVisHelper.fillCircle(g2d, canvasWidth/2,canvasHeight/2,200);

            AlgoVisHelper.setStrokeWidth(g2d,5);
            AlgoVisHelper.setColor(g2d, Color.RED);
            AlgoVisHelper.strokeCircle(g2d, canvasWidth/2,canvasHeight/2,200);
        }

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

    }
}