ClickTst.java

import java.awt.*;
import java.applet.Applet;

public class ClickTst extends Applet implements Runnable {
    int FontSize=12;
    int intStrPnt=3;
    String zahyo="Start";
    String NowZahyo="";
    String mUpZahyo;
    Thread th=null;
    Font f=new Font("TimesRoman",Font.PLAIN,FontSize);
    FontMetrics fm=getFontMetrics(f);
    int FontH=fm.getHeight();
    int px=300, py=150;
    int qx=FontH, qy=FontH;
    int rx=px+intStrPnt, ry=py+FontH/2;
    int sx=qx+intStrPnt, sy=qy-FontH/2;
    int tx=px, ty=py;
    int ax=2, ay=2;
    int RecLen=30;
    int flag=0;
    Button bt,bt2;
    Label lb;
    TextField tf,tf2,tf3;
    Label lb2;
    int slptime=100;
    int mDownflg=0;
    int vx,vy,wx,wy;

    public void init() {
        Choice c=new Choice();
        c.addItem("5");
        c.addItem("10");
        c.addItem("100");
        c.addItem("500");
        c.addItem("1000");
        c.select("100");
        add(new Label("ax="));
        add(tf=new TextField("2"));
        add(lb=new Label("ay="));
        add(tf2=new TextField("2"));
        add(bt=new Button("Change"));
        add(lb2=new Label("sleep time="));
        add(c);
        add(new Label("Font Size="));
        add(tf3=new TextField("10"));
        add(bt2=new Button("Change"));
    }

    public void start() {
        if (th==null) {
            th=new Thread(this);
            th.start();
        }
    }

    public void run() {
        while (true) {
          if (mDownflg==0) {
            if (tx<=0 || tx>=size().width-RecLen-2) ax=-ax;
            if (ty<=0 || ty>=size().height-RecLen-2) ay=-ay;
            if (tx<0) tx=1;
            if (ty<0) ty=1;
            if (tx>size().width-RecLen-2) tx=size().width-RecLen-3;
            if (ty>size().height-RecLen-2) ty=size().height-RecLen-3;
            tx+=ax;
            ty+=ay;
          }
            repaint();
            try {
                th.sleep(slptime);
            }
            catch (InterruptedException e) {}
        }
    }

/*
    public void update(Graphics g) {
        setBackground(Color.gray); repaint();
        paint(g);
    }
*/
    public void paint(Graphics g) {
        g.setFont(f);
if (flag!=0) {
            g.drawRect(qx-2,qy-2,4,4);
            g.drawLine(qx,0,qx,size().height);
            g.drawLine(0,qy,size().width,qy);
            g.drawString(NowZahyo,sx,sy);
            g.drawOval(vx,vy,4,4);
            g.drawString(mUpZahyo,wx,wy);
        }
        g.drawRect(px-2,py-2,4,4);
        g.drawString(zahyo,rx,ry);
        g.drawLine(0,0,size().width,0);
        g.drawLine(size().width-1,0,size().width-1,size().height-1);
        g.drawLine(size().width-1,size().height-1,0,size().height-1);
        g.drawLine(0,size().height,0,0);
        g.drawString("(" + size().width + "," + size().height + ")",FontH,FontH*3);
        if (ax*ay>0)
            g.drawRect(tx,ty,RecLen,RecLen);
        else
            g.fillRect(tx,ty,RecLen,RecLen);
        g.drawString(tf.getText(),50,50);
        g.drawString(" "+ax+"   "+ay,50,70);
        showStatus("("+(tx+RecLen/2)+","+(ty+RecLen/2)+")");
    }

    public boolean action(Event e, Object o) {
        if (e.target==bt && (e.id&Event.MOUSE_DOWN)!=0) {
                ax=Integer.parseInt(tf.getText());
                ay=Integer.parseInt(tf2.getText());
        }
        if (e.target instanceof Choice) {
            slptime=Integer.parseInt((String)o);
        }
        if (e.target==bt2 && (e.id&Event.MOUSE_DOWN)!=0) {
            FontSize=Integer.parseInt(tf3.getText());
            f=new Font("TimesRoman",Font.PLAIN,FontSize);
            fm=getFontMetrics(f);
        }
        return true;
    }

    public boolean mouseDown(Event e, int x, int y){
        mDownflg=1;
        px=x; py=y;
        tx=x-RecLen/2; ty=y-RecLen/2;
        rx=px+intStrPnt; ry=py+FontH/2;
        zahyo="("+px+","+py+")";
        int w=fm.stringWidth(zahyo);
        if (py<FontH/2) ry=FontH;
        if (py>size().height-FontH/2-2) ry=size().height-2;
        if (size().width-px<w+intStrPnt+1) {
            rx=px-w-intStrPnt;
        }
        //repaint();
        return true;
    }

    public boolean mouseDrag(Event e, int x, int y){
        tx=x-RecLen/2;
        ty=y-RecLen/2;
        mouseMove(e,x,y);
        return true;
    }

    public boolean mouseUp(Event e,int x,int y) {
        mDownflg=0;
        mUpZahyo="("+x+","+y+")";
        int w=fm.stringWidth(mUpZahyo);
        wx=x+intStrPnt; wy=y+FontH/2;
        if (y<FontH/2) wy=FontH;
        if (y>size().height-FontH/2-2) wy=size().height-2;
        if (size().width-x<w+intStrPnt+1) {
            wx=x-w-intStrPnt;
        }
        vx=x-2; vy=y-2;
        repaint();
        return true;
    }

    public boolean mouseMove(Event e, int x, int y){
        flag=1;
        qx=x; qy=y;
        sx=x+intStrPnt; sy=y-FontH/2;
        NowZahyo="(" + qx + "," + qy + ")";
        int w=fm.stringWidth(NowZahyo);
        if (qy<FontH+intStrPnt) {
            sy=qy+FontH;
            if (qx<w+intStrPnt+1)
                sx=qx+FontH*2;
            else
                sx=qx-w-intStrPnt;
        }
        if (size().width-qx<w+intStrPnt+1) {
            sx=qx-w-intStrPnt;
        }
        if ((x==tx || x==tx+RecLen) && (y>ty && y<ty+RecLen)) ax=-ax;
        if ((y==ty || y==ty+RecLen) && (x>tx && x<tx+RecLen)) ay=-ay;
        repaint();
        return true;
    }

    public void stop() {
        if (th!=null) {
            th.stop();
            th=null;
        }
    }
}