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Topic: cubic interpolation curve and bezier curve (Read 534 times) |
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Bijeoma
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cubic interpolation curve and bezier curve
« on: Aug 18th, 2004, 10:10pm » |
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whats the difference? its seems as if a bezier curve can produce a cubic interpolation curve or something similar. i have a set of adjacent points i want to use to create a smooth continous line. the bezier and curve functions use 4 points i want to enter 2 points A and B and let it return however many points between; i want to able to modify the resolution of the curve. any suggestions?
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| « Last Edit: Aug 18th, 2004, 10:12pm by Bijeoma » |
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fjen
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Re: cubic interpolation curve and bezier curve
« Reply #1 on: Aug 18th, 2004, 11:58pm » |
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(1)
Quote:| i have a set of adjacent points i want to use to create a smooth continous line. |
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use curveVertex to create a never-ending line.
http://processing.org/reference/curveVertex_.html
Code:
void setup(){size(100,100);}
void draw(){
beginShape(LINE_STRIP);
for (int i=0; i<100; i++){ curveVertex(random(width),random(height));}
endShape();
}
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(2)
Quote:| i want to enter 2 points A and B and let it return however many points between |
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an object defined only by 2 points is always a straight line ... just a thought. 
Quote:| i want to able to modify the resolution of the curve |
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you'll have to implement your own curve algorithm then. there is no way to have the inbetween-points returned by processing. see below ...
fast bezier: http://www.niksula.cs.hut.fi/~hkankaan/Homepages/bezierfast.html
it's implemention is here: http://www.florianjenett.de/p55/bezierfast/
i guess there are better implementations - but this one is said to be fast.
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| « Last Edit: Aug 19th, 2004, 12:07am by fjen » |
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fjen
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Re: cubic interpolation curve and bezier curve
« Reply #2 on: Aug 19th, 2004, 12:20am » |
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oh, btw. here's a post on the curveVertex minimal number of points:
http://processing.org/discourse/yabb/board_Proce55ing_website_b_ugs_action_display_num_1091446764.html
... and something on the smoothness of bezier(): Code:void setup(){size(100,100);}
void draw()
{
bezierSegments(5); // try changing this //
bezier(0,0,100,50,50,100,100,100);
} |
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Bijeoma
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Re: cubic interpolation curve and bezier curve
« Reply #3 on: Aug 19th, 2004, 12:35am » |
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thanks alot.
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fjen
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Re: cubic interpolation curve and bezier curve
« Reply #4 on: Aug 19th, 2004, 1:06pm » |
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just found this old flash code of mine ... but i can't remember where the original code came from.
bezier2D:
http://www.florianjenett.de/p55/bezier2D/
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