/*
a ramp class. 

Ramp() 
- duration in milliseconds 
- current millis() 
- starting point (-1 or 0)



*/



Ramp r1, r2;

void setup()
{
  size (300,300);
 r1 = new Ramp();
 r2 = new Ramp();
}

void draw()
{
 
  noStroke();
  fill (255,20); rect(0,0,width,height);


  fill (120);
  
  r1.trigger();
  r2.trigger();
  stroke(120 - (120* r1.rampValue));
  strokeCap(PROJECT);
strokeWeight (10 * r1.rampValue);

  line (0, height, width * r1.rampValue, height - (height * r1.rampValue));

}

void mousePressed() {

r1 = new Ramp(random(20000), millis(), 0);


}



class Ramp {
  float rampValue;    // current ramp value
  float rampStartMillis; // constructor init millisecond
  float rampDuration; // ramp duration in ms
  boolean run; // ramp trigger state
  int range; // -1 to 1 ( full ramp ) or 0 to 1 ( half ramp)
Ramp () { 
rampDuration = 0; 
rampStartMillis = 0; 
run = false;
rampValue = 0;
range = 0;
}  
Ramp (float duration, float startTime, int rampRange) {
  rampDuration = duration;
  rampStartMillis = startTime;
  run = true; 
  range = rampRange;  
}
    
    
      void trigger() {
	  if (rampValue == 1) {run = false;}
        if (run) {
      rampValue =  lerp(range,1, constrain((millis()-rampStartMillis)/rampDuration, 0, 1));
        }
     
      
      }
    
}