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Topic: accuracy error in positioning? (Read 419 times) |
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metaphorz
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accuracy error in positioning?
« on: Nov 6th, 2004, 10:22pm » |
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A student noticed this interesting anomoly. Copy
and paste this (either 68 or 69 versions of
Processing), run, and you'll notice that some circles
are perfectly circumscribed, but there are minor
visual errors in most of them (i.e., the circle edge
will overlap a side of a square). Looks like it could
be 1 or perhaps 2 pixels of error.
int numOfObjects = 40;//60;
int attributes[][];
int newAttributes[][];
void setup()
{
attributes = new int[numOfObjects][9];
newAttributes = attributes;
size(800, 800);
for (int i = 0; i < numOfObjects; i++)
{
attributes[i][0] = (int) random(0, width); // center x coordinate
attributes[i][1] = (int) random(0, height); // center y coordinate
attributes[i][2] = 200; // red saturation
attributes[i][3] = 200; // green saturation
attributes[i][4] = 200; // blue saturation
attributes[i][5] = 30; // rectangle width
attributes[i][6] = 30; // rectangle height
attributes[i][7] = 30; // ellipse width
attributes[i][8] = 30; // ellipse height
}
}
void loop()
{
ellipseMode(CENTER_DIAMETER);
rectMode(CENTER_DIAMETER);
for (int i = 0; i < numOfObjects; i++)
{
}
//attributes = newAttributes;
for (int i = 0; i < numOfObjects; i++)
{
fill(attributes[i][2], attributes[i][3], attributes[i][4]);
rect(attributes[i][0], attributes[i][1], attributes[i][5], attributes[i][6]);
push();
translate(attributes[i][0], attributes[i][1]);
push();
ellipse(0, 0, attributes[i][7], attributes[i][8]);
pop();
pop();
}
}
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metaphorz
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Re: accuracy error in positioning?
« Reply #2 on: Nov 8th, 2004, 1:21am » |
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Yes, I think you are right, after trying out
your code. BTW, nice/small zoom capability
on the 2nd example!
-pf
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