Calculate coordinates (math question)

General Discussion Other

clankill3r

Calculate coordinates (math question)

in General Discussion • Other • 2 years ago

I have a distance to travel, a rotation and a starting point.

for example:

distance to travel = 10
rotation = 30
startingpoint:
x = 40
y= 60

How can i calculate he new position?
(I want it done without push/popMatrix, rotate() and translate)

could someone help?

Replies(4)

amnon.owed

Re: Calculate coordinates (math question)

2 years ago

You can use vectors for this. Specifically line 16 in the example below.

Code Example

PVector start = new PVector(150, 150);
float distance = 100;
void setup() {
size(300, 300);
smooth();
}
void draw() {
background(255);
fill(0);
ellipse(start.x, start.y, 10, 10);
fill(255, 0, 0);
for (int i=0; i<12; i++) {
float rotation = radians(i*30);
PVector travel = new PVector(cos(rotation)*distance, sin(rotation)*distance);
PVector end = start.get();
end.add(travel);
line(start.x, start.y, end.x, end.y);
ellipse(end.x, end.y, 15, 15);
}
}

allonestr..

Re: Calculate coordinates (math question)

2 years ago

See http://forum.processing.org/topic/get-corner-coordinates-of-a-rectangle !

kooogy

Re: Calculate coordinates (math question)

2 years ago

> You can use vectors for this.

i think that's a bit misleading, the answer doesn't need vectors

x1 = x0 + r * cos (angle);
y1 = y0 + r * sin (angle);

and it's more to do with circles than rectangles 8)

clankill3r

Re: Calculate coordinates (math question)

2 years ago

All thanks,
I have it working now!

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