 |
Author |
Topic: how to draw an arc? (Read 241 times) |
|
mcbluebeard
|
how to draw an arc?
« on: Dec 23rd, 2003, 4:28am » |
|
Hi!
I'd like to fill an area between radius_1
and radius_2, as well as degree_1 and degree_2.
Such a thing is possible with the java fillArc()
method...but (and this is an awe-inspiring display of
idiocy) I can't figure out how to do this using
processing. Any help would be *greatly* appreciated!
Best, kyle
|
|
|
|
|
vent
|
Re: how to draw an arc?
« Reply #1 on: Dec 23rd, 2003, 5:33am » |
|
Give this a try:
Code:
void setup(){
size(400,400);
}
void loop(){
background(0);
beginShape( POLYGON );
//regular point
bezierVertex(50, 100);
//anchor point
bezierVertex(50+mouseX, 50);
//anchor point
bezierVertex(150, mouseY );
//regular point
bezierVertex( 100, 200 );
endShape();
}
|
|
|
http://www.shapevent.com/
|
|
|
toxi
|
Re: how to draw an arc?
« Reply #2 on: Dec 23rd, 2003, 10:22pm » |
|
this came up a few times in the past. here's some code using triangle strips. it won't look pretty with stroke() turned on...
Code:void setup(){
size(400,400);
}
void loop() {
background(51);
// center x,y
float cx=200;
float cy=200;
// start/end angles
float a1=-PI/8;
float a2=TWO_PI/3;
// number of steps
float steps=12;
float stepSize=(a2-a1)/steps;
// inner/outer radius
float r1=abs(cx-mouseX);
float r2=abs(cy-mouseY);
// colour
fill(255,0,0);
noStroke();
beginShape(TRIANGLE_STRIP);
for (float i = a1; i <= a2; i +=stepSize) {
vertex(r1*cos(i)+cx, r1*sin(i)+cy);
vertex(r2*cos(i)+cx, r2*sin(i)+cy);
}
endShape();
} |
|
hth!
|
http://toxi.co.uk/
|
|
|
mcbluebeard
|
Re: how to draw an arc?
« Reply #3 on: Dec 30th, 2003, 4:13am » |
|
Thanks so much toxi -- I appreciate your help!
It works like a champ.
|
|
|
|
|
|
