//BrushStrokes - Visuals-only applet version of the BrushStrokes
//               VST plugin.

PImage mousePoint;
int xPos;
int yPos;
int[] xPrev;
int[] yPrev;

void setup()
{
  int x, y;
  int tempint;
  float tempf;
  xPos = 0;
  yPos = 0;

  xPrev = new int[64];
  yPrev = new int[64];

  //Setup mousePoint image.
  mousePoint = new PImage(16, 16);

  for(y=0;y<16;++y)
  {
    for(x=0;x<16;++x)
    {
      tempf = sin(((float)x/16.0)*PI);
      tempf *= sin(((float)y/16.0)*PI);
      tempf = (exp(tempf)-1.0)/(exp(1.0)-1.0) * 1.5 - 0.1;
      if(tempf < 0.0)
        tempf = 0.0;
      else if(tempf > 1.0)
        tempf = 1.0;
      tempint = (int)(tempf * 255.0);
      mousePoint.pixels[(y*16)+x] = color(255, 0, 0, tempint);
    }
  }
  size(320, 240);
  frameRate(30);
  smooth();
}

void draw()
{
  int i;
  float tempf;

  noStroke();

  //Update trail stuff.
  for(i=63;i>0;--i)
  {
    xPrev[i] = xPrev[i-1];
    yPrev[i] = yPrev[i-1];
  }
  xPrev[0] = xPos;
  yPrev[0] = yPos;

  background(255);

  //Draw trail.
  for(i=1;i<64;++i)
  {
    tempf = (1.0-((float)i/64.0)) * 5.0;
    fill(255, 0, 0, (255-(int)(255.0*((float)i/64.0))));
    quad(xPrev[i-1], (yPrev[i-1]+tempf),
         xPrev[i], (yPrev[i]+tempf),
         xPrev[i], (yPrev[i]-tempf),
         xPrev[i-1], (yPrev[i-1]-tempf));
  }

  //Draw mouse pointer.
  image(mousePoint, xPos-8, yPos-8);

  //Draw dotted outline.
  /*stroke(127);
  for(i=0;i<320;i+=2)
  {
    point(i, 0);
    point(i, 239);
  }
  for(i=0;i<240;i+=2)
  {
    point(0, i);
    point(319, i);
  }*/
}

void mouseMoved()
{
  xPos = mouseX;
  yPos = mouseY;
}