Mouse 1D.

Move the mouse left and right to shift the balance. The “mouseX” variable is used to control both the size and color of the rectangles.

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void setup() {
  size(640, 360);
  noStroke();
  colorMode(RGB, height, height, height);
  rectMode(CENTER);
}

void draw() {
  background(0.0);

  float r1 = map(mouseX, 0, width, 0, height);
  float r2 = height-r1;
  
  fill(r1);
  rect(width/2 + r1/2, height/2, r1, r1);
  
  fill(r2);
  rect(width/2 - r2/2, height/2, r2, r2);
}

Functions Used

fill()

Sets the color used to fill shapes

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size()

Defines the dimension of the display window width and height in units of pixels

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rectMode()

Modifies the location from which rectangles are drawn by changing the way in which parameters given to rect() are intepreted

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rect()

Draws a rectangle to the screen

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setup()

The setup() function is run once, when the program starts

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map()

Re-maps a number from one range to another

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colorMode()

Changes the way Processing interprets color data

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draw()

Called directly after setup(), the draw() function continuously executes the lines of code contained inside its block until the program is stopped or noLoop() is called

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noStroke()

Disables drawing the stroke (outline)

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background()

The background() function sets the color used for the background of the Processing window

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