// Sketch: Shows how to define and use a function that returns a value: distance()
// By: Deepak Kumar
// Date: September 19, 2022
// Each mouse click draws a line from the origin to the place where mouse
// is clicked. Also, displays the computed distance (in pixels) from the origin.

void setup() {
   size(500, 500);
   background(255);
} // setup()

float x = 100, y = 100;
   void draw() {
   background(255);

 line(0, 0, x, y);
   fill(0);
   float d = distance(0, 0, x, y);
   text(d, x, y);
} // draw()

float distance(float x1, float y1, float x2, float y2) {
   // Returns the distance between the points (x1, y1) and (x2, y2)
   float dx = x1 - x2;
   float dy = y1 - y2;
   return sqrt(dx*dx + dy*dy);
} // distance()

void mousePressed() {
   x = mouseX;
   y = mouseY;

} // mousePressed()