How to store co-ordinates of all shapes on a canvas - processing

Question

I am trying to create a sketch which consists of randomly placed lines with random angulations and strokeWeight. The idea is that at each frame the lines change their tilt slightly according to a preset rule which in turn depends on the strokeWeight and other parameters. To do this I think I need to record the co-ordinates of each line at setup and then transform them and then record them again. If that makes sense.
Basically the question boils down to how can I record the co-ordinates of all the lines on a canvas?
Here is what I have written so far but how do I store the shape co-ordinates:
//Sets up the random lines on the canvas
//Sets up the authorities (line widths)
//Sets up the connections between lines
void setup() {
background(204);
size(800, 800);
for (int x=1;x <1000;x +=1){
fill(75, 70, 80);
//For the x y cords
float r = random(800);
float s = random(800);
//for the strokeWeight
float fat = random(5);
//for the stroke colour which varies with stroke weight
float col = random(350);
float red = random(350);
float g = random(350);
float b = random(350);
//for the initial tilt
float rot = random(360);
//stroke(242, 204, 47, 255);
strokeWeight(fat);
//stroke (red,green,blue,opacity)
stroke(fat*100, 180, 180);
//stroke(242, 204, 47, 255);
line(r,s,r+10,s+10);
rotate(radians(rot));
}
}
//This part is the diffusion animation
void draw() {
}

Answer 1

You might want to create a Line class that holds the information necessary to draw a line. Something like this:
class Line{
float x1, y1, x2, y2;
public Line(float x1, float y1, float x2, float y2){
this.x1 = x1;
this.y1 = y1
this.x2 = x2;
this.y2 = y2;
}
public void draw(){
line(x1, y1, x2, y2);
}
public boolean intersects(Line other){
//left as exercise for reader
}
}
Then you can randomly generate lines:
ArrayList<Line> lines = new ArrayList<Line>();
void setup(){
for(int i = 0; i < 10; i++){
lines.add(new Line(random(width), random(height), random(width), random(height));
}
}
void draw(){
background(0);
for(Line line : lines){
line.draw();
}
}
This is what I was getting at when I told you in your other question that you need to create a data structure and store your line coordinates. From here you can write logic that moves your lines around, or detects intersections, etc.