SketchPad - OpenProcessing

mySketch
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//colors--------------------------------------------------------------------------------
color Violet = color(148, 0, 211);
color Indigo = color(75, 0, 130);
color Blue = color(0, 0, 255);
color Green = color(0, 255, 0);
color Yellow = color(255, 255, 0);
color Orange = color(255, 127, 0);
color Red = color(255, 0 , 0);
​
color colors[] = {Violet,Indigo,Blue,Green,Yellow,Orange,Red};
​
int colori=0;
​
PGraphics canvas[] = new PGraphics[10];
​
int h,w;
int canvasi=0;
​
void setup()
{
  //size(500,500);
  
  fullScreen();
  frameRate(100);
  
  h = height;
  w = width; 
  
  //creating background
  for(int n=0;n<canvas.length;n++)
  {
  canvas[n] = createGraphics(w,h-h/10);
  canvas[n].beginDraw();
  canvas[n].background(100);
  canvas[n].endDraw();
  canvas[n].strokeWeight(5);
  }
 
 //Buttuns
  noStroke();
  fill(#00DBFF);
  rect(0,h-h/10,w/3,h);
  fill(#FF0004);
  rect(w/3,h-h/10,2*w/3,h);
  fill(#00DBFF);
  rect(2*w/3,h-h/10,w,h);
  
  //for lines
  
  
}
​
void draw()
{
  //Canvas
 
 
    canvas[canvasi].beginDraw();
    
    if(mousePressed&&mouseY<h-h/10)
      { 
      canvas[canvasi].line(mouseX, mouseY, pmouseX, pmouseY);  
      }
      
    canvas[canvasi].endDraw();
   
    image(canvas[canvasi], 0, 0); 
    text(canvasi,50,50);
 
   
}
​
void mouseClicked()
  {
    if(mouseY>h-h/10)
    {
      if(mouseX<w/3&&canvasi>0)
      {
        canvasi--;
      }
      else if(mouseX>2*w/3&&canvasi+1<canvas.length)
      {
        canvasi++;
      }
      else
     {
      
         canvas[canvasi].beginDraw();
         canvas[canvasi].background(100);
         canvas[canvasi].endDraw();
      
     }
    }
  }
  
void mouseReleased()
{ if(colori+1<colors.length)
  {
    colori++;
  } 
  else
  {
    colori=0;
  }
}
​
​
void mouseDragged() 
{
     canvas[canvasi].stroke(colors[colori]);
}
   