Please how to get line with constant length following mouse ?
(I was looking on Google but I don't even/already know what words to look for)
I have made this, but there must be smarter way to make it - without loop just with calculation.
I want to make line to follow mouse (for start), like if I pick solid stick at first point, second point will follow my hand at the same distance. Even better line with fixed length moving on a curve with both points. (Like wagon on a curved railway - and that's what's going on about here - more lines moving on a curve like train). Btw sorry for my weak english.
Thank you very much
ConstLenLine lin;
void setup() {
size(640, 480, P2D);
background(250);
stroke(0);
smooth();
lin = new ConstLenLine();
}
void draw() {
background(250);
lin.update();
lin.draw();
}
class ConstLenLine {
float len = 50; // length of the line
PVector A, B, eq;
ConstLenLine() {
A = new PVector(mouseX, mouseY);
B = new PVector(A.x, A.y+len);
eq = new PVector(0, 0);
}
void update() {
A = new PVector(mouseX, mouseY);
if (round(A.dist(B))>len)
eq.add(PVector.sub(A, B));
if (round(A.dist(B))<len)
eq.sub(PVector.sub(A, B));
eq.normalize();
int count=0;
while (round (A.dist (B)) != len) {
//how to do it without this lame loop, just with computing
B.add(eq);
if (count>1000)
break; // just for sure, I don't like infinite loops