1.自顶向下
AlgoFrame.java
package Test;
import java.awt.*;
import javax.swing.*;
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;
}
// data
private MergeSortData data;
public void render(MergeSortData data) {
this.data = data;
repaint();
}
private class AlgoCanvas extends JPanel {
public AlgoCanvas() {
// 双缓存
super(true);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
// 抗锯齿
RenderingHints hints = new RenderingHints(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.addRenderingHints(hints);
// 具体绘制
int w = canvasWidth / data.N();
for (int i = 0; i < data.N(); i++) {
if (i >= data.l && i <= data.r)
AlgoVisHelper.setColor(g2d, AlgoVisHelper.Green);
else
AlgoVisHelper.setColor(g2d, AlgoVisHelper.Grey);
if (i >= data.l && i <= data.mergeIndex)
AlgoVisHelper.setColor(g2d, AlgoVisHelper.Red);
AlgoVisHelper.fillRectangle(g2d, i * w, canvasHeight - data.get(i), w - 1, data.get(i));
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(canvasWidth, canvasHeight);
}
}
}
AlgoVisHelper.java
package Test;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.lang.InterruptedException;
public class AlgoVisHelper {
private AlgoVisHelper(){
}
public static final Color Red = new Color(0xF44336);
public static final Color Pink = new<