java - how do I update new image on JFrame ? (I tried everything but it didn't work) -


so source code, i'm trying make stick man moving first, tried make head moving. works, problem past movement , reccentt movement stick goes ooooooooooo when it's supposed go o

i tried repaint() validate() updateui() still didn't work

any idea?

    package jamestestpackage;     import java.awt.*;     import java.awt.event.actionevent;     import java.awt.event.actionlistener;     import java.awt.event.keyevent;     import java.awt.event.keylistener;      import javax.swing.*;     public class stickmanui extends jpanel implements actionlistener, keylistener{ timer t = new timer(1,this); int x=180; int x_vel = 0; int y_vel = 0; public stickmanui(){     t.start();     addkeylistener(this);     setfocusable(true); } public void paintcomponent(graphics g) {     graphics2d g2 = (graphics2d) g;      g2.setstroke(new basicstroke(5));      g2.drawline(200, 50, 200, 100); // body      g2.drawline(200, 100, 220, 150); // right leg      g2.drawline(200, 100, 180, 150); // left leg      g2.drawline(200, 75, 170, 100); //left arm      g2.drawline(200, 75, 230, 100); //right arm      g2.drawoval(x, 10, 40, 40); // head   } @override public void actionperformed(actionevent arg0) {     // todo auto-generated method stub     x= x + x_vel;     repaint(); } @override public void keypressed(keyevent arg0) {     // todo auto-generated method stub     if(arg0.getkeycode()==keyevent.vk_right)         x_vel = 1;     else if(arg0.getkeycode() == keyevent.vk_left)         x_vel = -1;  } @override public void keyreleased(keyevent arg0) {     // todo auto-generated method stub     x_vel =0; } @override public void keytyped(keyevent arg0) {     // todo auto-generated method stub  } }

when doing custom painting first statement in paintcomponent() method should be:

super.paintcomponent(g);

to make sure background cleared before painting done.

read section swing tutorial on custom painting more information , working examples started.


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