<Swing Dev> JDK-8178091 : Bug I will workin on

[Patrick Chen]

After tests it seems that the problem doesn't come from Timer , but
the repaint() method ,


even with this code the bug is here.
the bug is on Linux.

2017-04-11 11:07 GMT+02:00 Walter Laan <WLaan at costengineering.eu>:

> Note that the example code in JDK-8178091 sleeps on the EDT, so you’re
> lucky it paints at all instead of hanging the UI.
>
>
>
> It looks like you adapted the code from http://codereview.
> stackexchange.com/questions/29630/simple-java-animation-with-swing where
> no-one experienced with Swing pointed out this error L.
>
>
>
> Using a javax.swing.Timer (not the java.util.Timer!) and it runs okay
> (using Win10, Java 8u101):
>
>
>
>     *private* *void* go() {
>
>
>
>         *new* Timer(10, *new* ActionListener() {
>
>             // *Les* *coordonnées* *de* *départ* *de* *notre* *rond*
>
>             *private* *int* x = pan.getPosX(), y = pan.getPosY();
>
>             // *Le* *booléen* pour *savoir* *si* l'on *recule* *ou* non
> *sur* l'axe x
>
>             *private* *boolean* backX = *false*;
>
>             // *Le* *booléen* pour *savoir* *si* l'on *recule* *ou* non
> *sur* l'axe y
>
>             *private* *boolean* backY = *false*;
>
>
>
>             @Override
>
>             *public* *void* actionPerformed(ActionEvent e) {
>
>                 // *Si* *la* *coordonnée* x est *inférieure* à 1, on
> *avance*
>
>                 *if*(x < 1) {
>
>                     backX = *false*;
>
>                 }
>
>                 // *Si* *la* *coordonnée* x est *supérieure* à *la*
> *taille* *du* *Panneau* *moins* *la* *taille* *du* *rond*, on *recule*
>
>                 *if*(x > pan.getWidth() - 50) {
>
>                     backX = *true*;
>
>                 }
>
>                 // *Idem* pour l'axe y
>
>                 *if*(y < 1) {
>
>                     backY = *false*;
>
>                 }
>
>                 *if*(y > pan.getHeight() - 50) {
>
>                     backY = *true*;
>
>                 }
>
>
>
>                 // *Si* on *avance*, on *incrémente* *la* *coordonnée*
>
>                 // backX est *un* *booléen*, *donc* !backX *revient* à
> *écrire*
>
>                 // if (backX == false)
>
>                 *if*(!backX) {
>
>                     pan.setPosX(++x);
>
>                 // *Sinon*, on *décrémente*
>
>                 }
>
>                 *else* {
>
>                     pan.setPosX(--x);
>
>                 }
>
>                 // *Idem* pour l'axe Y
>
>                 *if*(!backY) {
>
>                     pan.setPosY(++y);
>
>                 }
>
>                 *else* {
>
>                     pan.setPosY(--y);
>
>                 }
>
>
>
>                 // On *redessine* *notre* *Panneau*
>
>                 pan.repaint();
>
>             }
>
>         }).start();
>
>     }
>
>
>
> Hope that helps,
>
> Walter.
>
>
>
> *From:* swing-dev [mailto:swing-dev-bounces at openjdk.java.net] *On Behalf
> Of *Patrick Chen
> *Sent:* maandag 10 april 2017 12:23
> *To:* swing-dev at openjdk.java.net
> *Subject:* Re: <Swing Dev> JDK-8178091 : Bug I will workin on
>
>
>
> (edit : for example this game coded in java : https://github.com/
> cloudStrif/GoldenSunD will work with java 7
>
> but clearly not with java8 (linux 64 bits) because of lags)
>
>
>
> 2017-04-10 12:19 GMT+02:00 Patrick Chen <chen.j.patrick at gmail.com>:
>
> Hi every one ,
>
> just wanted to inform that I am working to fix this bug.
>
>
>
> it is when we devellop animations thanks to repaint() method ,
>
> for java 7 it works well
>
> but with java8 not ,
>
> (linux 64 bits it doesn't really work )
>
>
>
> so after watching the source code it seem that it is not a swing problem
>
> but AWT : Component.java .
>
>
>
> thank you
>
>
>
>
>
>
>
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