Processing 1.0 - Processing Discourse - Simple math trigonometry question

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Simple math trigonometry question (Read 862 times)

anachronik

Simple math trigonometry question
Sep 8^th, 2009, 1:52am

Hello,

I'm actually trying to figure out what's the white magic behind curve() and curveVertex() functions' secrets.

So that i started a very simple sketch.
Basically, the sketch draw the controls points along the curve i want to draw (i.e a simple circle shape).

The point i don't get so far is why only four points are draw ? I don't really get why when i = 3 the point(0.38*offset, 0.9*offset) does not appear ?

Here's the source:

Code:


int steps = 4;
int offset = 50;

size(200, 200);
background(255);
noFill();
translate(width/2, height/2);

for (int i=0; i <= steps; i++){
  point(cos(radians((90/steps) * i)) * offset, sin(radians((90/steps) * i)) * offset);
}

I know this is pretty simple but there's something i certainly don't get.
Thx by advance

jaylfk

Re: Simple math trigonometry question
Reply #1 - Sep 8^th, 2009, 2:13am

I'm running your code with P5 1.0.7 on Mac OS SL 10.6 with Java 1.5 and don't see any problem.

Code:


int steps = 4;
int offset = 50;

void setup(){
  size(200, 200, P2D);
}

void draw(){
background(255);
noFill();
translate(width/2, height/2);

for (int i=0; i <= steps; i++){
  point(cos(radians((90/steps) * i)) * offset, sin(radians((90/steps) * i)) * offset);
 }
}

anachronik Junior Member Offline Posts: 80	Re: Simple math trigonometry question Reply #2 - Sep 8^th, 2009, 2:21am Ah thx for the answer !!! I'm sure this must come from my workstation. 16mo video memory is kinda retro-hardcore. Thx for the answer. At least no mistake in my code.

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