实现效果
实现第个气泡中心显示一个字，在框中随意运动，用空格键按下运行停止，再按下左键运动继续。用鼠标左键按下选中的圆变为填充的，再次按下又变为不填充的。参考：https://github.com/liuyubobobo/
示例代码
AlgoVisualizer.java
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import java.awt.*; import java.awt.event.*;
public class AlgoVisualizer { private Object data; private Circle[] circles; private AlgoFrame frame; private boolean isAnmiated = true;
public AlgoVisualizer(int sceneWidth, int sceneHeight, int N){
circles = new Circle[N]; int R = 50;
for(int i = 0; i < N; i++) { int x = (int)(Math.random()*(sceneWidth-2*R)) + R; int y = (int)(Math.random()*(sceneHeight-2*R)) + R;
int vx = (int)(Math.random()*11) - 5; int vy = (int)(Math.random()*11) - 5; circles[i] = new Circle(x, y, R, vx, vy);
}
EventQueue.invokeLater(()->{ frame = new AlgoFrame("Welcome-Java", sceneWidth, sceneHeight); frame.addKeyListener(new AlgoKeyListener()); frame.addMouseListener(new AlgoMouseListener());
new Thread(()->{run();}).start(); }); }
public AlgoVisualizer(int sceneWidth, int sceneHeight, int N, String centerLael){
Circle.showLabel = true;
circles = new Circle[N]; int R = 50;
for(int i = 0; i < N; i++) { int x = (int)(Math.random()*(sceneWidth-2*R)) + R; int y = (int)(Math.random()*(sceneHeight-2*R)) + R;
int vx = (int)(Math.random()*11) - 5; int vy = (int)(Math.random()*11) - 5; circles[i] = new Circle(x, y, R, vx, vy); circles[i] = new Circle(x, y, R, vx, vy, centerLael.charAt(i) + "");
}
EventQueue.invokeLater(()->{ frame = new AlgoFrame("Welcome-Java", sceneWidth, sceneHeight); frame.addKeyListener(new AlgoKeyListener()); frame.addMouseListener(new AlgoMouseListener()); new Thread(()->{ run(); }).start(); }); }
private void run(){
while(true) { //绘制当前数据 frame.render(circles); AlgoVisHelper.pause(20); //更新数据 if(isAnmiated) { for(Circle circle:circles) circle.move(0, 0, frame.getCanvasWidth(), frame.getCanvasHeight()); } } }
private class AlgoKeyListener extends KeyAdapter { @Override public void keyReleased(KeyEvent event) { if(event.getKeyChar() == ' ') { isAnmiated = !isAnmiated; } } }
private class AlgoMouseListener extends MouseAdapter{ @Override public void mousePressed (MouseEvent event) { event.translatePoint(0, // (frame.getBounds().height -frame.getCanvasHeight())); -(frame.getBounds().height -frame.getCanvasHeight()));
// System.out.println(event.getPoint());
for(Circle circle:circles) { if(circle.contain(event.getPoint())){ circle.isFilled = !circle.isFilled; }
}
} }
public static void main(String[] args) {
String poemData = "三月七日沙湖道中遇雨。雨具先去，同行皆狼狈，余独不觉。已而遂晴，故作此词 \n" + "莫听穿林打叶声，何妨吟啸且徐行。竹杖芒鞋轻胜马，谁怕？ 一蓑烟雨任平生。\n" + "料峭春风吹酒醒，微冷，山头斜照却相迎。回首向来萧瑟处，归去，也无风雨也无晴。";
int sceneWidth = 800; int sceneHeight = 800; int N = 15;
// AlgoVisualizer visualizer = new AlgoVisualizer(sceneWidth, sceneHeight, N); AlgoVisualizer visualizer = new AlgoVisualizer(sceneWidth, sceneHeight, N, poemData);
} } |
AlgoFrame.java
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import javax.swing.*; import java.awt.*;
public class AlgoFrame extends JFrame { private int canvasWidth; private int canvasHeight; public AlgoFrame(String title, int canvasWidth, int canvasHeight){
super(title);
this.canvasHeight = canvasHeight; this.canvasWidth = canvasWidth;
AlgoCanvas canvas = new AlgoCanvas(); setContentPane(canvas); pack();
setResizable(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); }
public AlgoFrame(String title){ this(title, 1024, 768); }
public int getCanvasWidth(){return canvasWidth;} public int getCanvasHeight() {return canvasHeight;}
private Circle[] circles;
public void render(Circle[] circles) { this.circles = circles; repaint(); }
private Object data; public void render(Object data) { this.data = data; repaint(); } private class AlgoCanvas extends JPanel{
public AlgoCanvas(){ super(true); }
@Override public void paintComponent(Graphics g){ super.paintComponent(g); Graphics2D g2d =(Graphics2D)g;
RenderingHints hints = new RenderingHints( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.addRenderingHints(hints);
AlgoVisHelper.setStrokeWidth(g2d, 1); AlgoVisHelper.setColor(g2d, Color.RED);
g2d.setFont( new Font("SimSun", Font.BOLD, 16));
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()); }
if(Circle.showLabel) { // AlgoVisHelper.showPoem(g2d,circle.x, circle.y, circle.centerLabel); AlgoVisHelper.drawText(g2d,circle.centerLabel,circle.x, circle.y);
} }
}
@Override public Dimension getPreferredSize(){ // System.out.println("Run getPreferredSize()"); return new Dimension(canvasWidth, canvasHeight); } } } |
Circle.java
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import java.awt.*;
public class Circle { public int x, y; private int r; public int vx, vy; public String centerLabel; static public boolean showLabel = false; public boolean isFilled = false;
public Circle(int x, int y, int r, int vx, int vy) { this.x = x; this.y = y; this.r = r; this.vx = vx; this.vy = vy; } public Circle(int x, int y, int r, int vx, int vy, String centerLabel) { this.x = x; this.y = y; this.r = r; this.vx = vx; this.vy = vy; this.centerLabel = centerLabel; } public int getR(){return r;}
public void move(int minx, int miny, int maxx, int maxy){ x += vx; y += vy;
checkCollision(minx, miny, maxx, maxy); }
private void checkCollision(int minx, int miny, int maxx, int maxy) { if (x - r < minx) { x = r; vx = -vx; } if (x + r >= maxx) { x = maxx - r; vx = -vx; } if (y - r < miny) { y = r; vy = -vy; } if (y + r >= maxy) { y = maxy - r; vy = -vy; }
}
public boolean contain(Point p) { return (x - p.x) * (x - p.x) + (y - p.y)*(y - p.y) <= r*r; }
} |
AlgoVisHelper.java
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import javax.swing.*; import java.awt.*; import java.awt.geom.Ellipse2D; import java.awt.geom.Rectangle2D;
public class AlgoVisHelper { private AlgoVisHelper(){}
public static void setStrokeWidth(Graphics2D g2d, int w){ int strokeWidth = w; g2d.setStroke(new BasicStroke(strokeWidth, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); }
public static void strokeCircle(Graphics2D g2d, int x, int y, int r){ Ellipse2D circle = new Ellipse2D.Double(x-r, y-r, 2*r, 2*r); g2d.draw(circle); }
public static void fillCircle(Graphics2D g2d, int x, int y, int r){ Ellipse2D circle = new Ellipse2D.Double(x-r, y-r, 2*r, 2*r); g2d.fill(circle); }
public static void strokeRectangle(Graphics2D g2d, int x, int y, int w, int h) { Rectangle2D rectangle = new Rectangle2D.Double(x, y, w, h); g2d.draw(rectangle); }
public static void fillRectangle(Graphics2D g2d, int x, int y, int w, int h) { Rectangle2D rectangle = new Rectangle2D.Double(x, y, w, h); g2d.fill(rectangle); }
public static void putImage(Graphics2D g2d, int x, int y, String imageURL){ ImageIcon icon = new ImageIcon(imageURL); Image image = icon.getImage(); g2d.drawImage(image, x, y, null); }
public static void drawText(Graphics2D g2d, String text, int centerx, int centery) { if(text == null) throw new IllegalArgumentException("Text is null");
FontMetrics metrics = g2d.getFontMetrics(); int w = metrics.stringWidth(text); int h = metrics.getDescent(); g2d.drawString(text, centerx - w/2, centery + h); }
public static void showPoem(Graphics2D g2d, int x, int y, String poem){
g2d.drawString(poem,x, y);
// g2d.drawString("醉", x, y); } public static void setColor(Graphics2D g2d, Color color){ g2d.setColor(color); }
public static void pause(int t) { try{ Thread.sleep(t); } catch (InterruptedException e){ System.out.println("Error in sleepping"); } }
} |
