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Topic: bezierVertex (Read 296 times) |
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benelek
 
 
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bezierVertex
« on: Jan 10th, 2003, 1:18pm » |
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the beginShape() / endShape() method of drawing bezierVertex seems to do strange things when more than 4 points are specified.
it looks to me like proce55ing renders the initial bezier curve, but then continues it by drawing a straight line from the last point to the second-last control point, and then starting a new bezier curve from there.
below is the code of a program that clarifies this visually. (click three times to create the first 4 bezier control points, then keep clickin'!)
Code:
// testing a method for displaying objects linked by bezier lines
// written by benelek, 2003.
void setup() {
size(300,300);
background(255);
}
int[][] objects = {
{5},
{10}
};
int rY = 0;
void loop() {
// draw all known objects, and link them by lines.
translate(width/2,height/2,-objects[0].length);
rotateY(radians(rY));
translate(-width/2,-height/2,objects[0].length);
beginShape(LINE_STRIP);
for(int i=0; i<objects[0].length; i++) {
bezierVertex(objects[0][i],objects[1][i],3*(i-objects[0].length));
//println(objects[0].length);
}
endShape();
}
void mousePressed() {
// create new object
int x = mouseX;
int y = mouseY;
objects[0] = grow(objects[0], x);
objects[1] = grow(objects[1], y);
}
void mouseDragged() {
if(keyPressed && key==' ') {
if(mouseX-pmouseX>0) {
rY+=3;
} else {
rY-=3;
}
}
}
void mouseReleased() {
rY=0;
}
int[] grow( int[] theArray, int newNum) {
int[] temp = new int[theArray.length+1];
System.arraycopy(theArray,0,temp,0,theArray.length);
temp[theArray.length]=newNum;
theArray=temp;
return theArray;
}
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as i said, the problem only occurs for more than 4 control points, so i may be begging the strange result - or this may be a bug.
-jacob
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fry
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Re: bezierVertex
« Reply #1 on: Jan 10th, 2003, 4:34pm » |
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nope, that looks like a bug.
drawing continuous beziers is a bit tricky in principle but this looks like the indexing is off.
thanks for the example, will try fix this shortly.
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fry
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Re: bezierVertex
« Reply #2 on: Sep 18th, 2003, 4:03am » |
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this was finally repaired in a recent release.
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