1. float x = 100;
   float y = 100;
   float angle1 = 0.0;
   float segLength = 50;
   
   void setup() {
     size(640, 360);
     strokeWeight(20.0);
     stroke(255, 100);
   }
   
   void draw() {
     background(0);
     
     float dx = mouseX - x;
     float dy = mouseY - y;
     angle1 = atan2(dy, dx);  
     x = mouseX - (cos(angle1) * segLength);
     y = mouseY - (sin(angle1) * segLength);
    
     segment(x, y, angle1); 
     ellipse(x, y, 20, 20);
   }
   
   void segment(float x, float y, float a) {
     pushMatrix();
     translate(x, y);
     rotate(a);
     line(0, 0, segLength, 0);
     popMatrix();
   }

But with an image instead of a segment. It seems I can't do it with an image though, it tells me the method

is not applicable for the arguments...

Thank you for any help understanding how i could do this :)