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Author |
Topic: Refresh problems (Read 301 times) |
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st33d
 
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Refresh problems
« on: Jan 17th, 2005, 1:52am » |
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Any ideas on what might be causing the slow refresh on this spring applet I've just coded? Is there a way to fix it?
Code:
spring one;
void setup(){
size(200,200);
one = new spring (100,0,100,100);
}
void loop(){
background(200);
if (mousePressed && overRect(mouseX,mouseY,one.x2-5,one.y2-5,one.x2+5,one.y2+5)){
one.move();
}
one.updateTop();
one.d();
}
class spring{
float x1,y1,x2,y2,r;
spring (float x1, float y1, float x2, float y2){
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
r = sqrt(sq(x1-x2)+sq(y1-y2));
}
void move(){
x2 = mouseX;
y2= mouseY;
}
void updateTop(){
float l = sqrt(sq(x1-x2)+sq(y1-y2));
float th = atan2 (y1-y2,x1-x2);
if (int(l) != int(r)){
l -= impulse (l,r);
x2 = cos (th) * l;
y2 = sin (th) * l;
}
}
void d(){
ellipse (x1-5,y1-5,10,10);
ellipse (x2-5,y2-5,10,10);
line(x1,y1,x2,y2);
}
}
float impulse (float span, float rest){
return float(Math.log(span)) - float(Math.log(rest));
}
boolean overRect(float xo, float yo, float x1, float y1, float x2, float y2){
if (xo >= x1 && xo <= x2 &&
yo >= y1 && yo <= y2) {
return true;
} else {
return false;
}
}
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I could murder a pint.
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