Nicola's Hue Experiment

Original program

My version

I played around Processing's Hue example to re-acquaint myself with the Processing environment and language. This program draws a 20px wide box at the x-position of the cursor (mouseX) and fills it with a color (HSB mode) according to the y-position of the cursor (mouseY).

I changed it to draw 1px wide boxes at the entire area's width minus mouseX (so it does not directly follow the cursor), and the height of the lines shrink and shrink and then grow to full height again.

Here is the code with my edits highlighted:

int barWidth = 1;
int lastBar = -1;
int count = 1;

void setup() 
{
  size(640, 360);
  colorMode(HSB, height, height, height);  
  noStroke();
  background(0);
}

void draw() 
{
  int whichBar = width - (mouseX / barWidth);
  if (whichBar != lastBar) {
    int barX = whichBar * barWidth;
    fill(mouseY, height, height);
    rect(barX, count/2, barWidth, height-count);
    lastBar = whichBar;
  }
  if (count <= height) {
    count++;
  } else {
    count = 1;
  }
}