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p5.js | lerpColor() Function
  • Last Updated : 26 Feb, 2020

The lerpColor() function is used to interpolate two colors to find a third color between them. The amount of interpolation between the two colors can be set using the amt parameters. The color interpolation depends on the current color mode.

Syntax:

lerpColor(c1, c2, amt)

Parameters: This function accepts three parameters as mentioned above and described below:

  • c1: It is a p5.Color which represents the first color from which the final color will be interpolated.
  • c2: It is a p5.Color which represents the second color to which the final color will be interpolated.
  • amt: It is a number between 0 and 1 which determines which color will be used more for the interpolation. A value near 0.1 would prefer the first color more and a value near 0.9 would prefer the second color for interpolation.

Return Value: It returns a p5.Color element with the interpolated color.

The example below illustrate the lerpColor() function in p5.js:



Example:




function setup() {
  createCanvas(500, 350);
  textSize(18);
    
  text("From Color", 20, 20);
  fromColor = color("red");
  
  text("Lerped Color", 150, 20);
  
  text("To Color", 300, 20);
  toColor = color("blue");
    
  text("Adjust this slider to change the"+
             " amount of lerping", 20,  200)
  alphaSlider = createSlider(0, 100, 50);
  alphaSlider.position(20, 220);
  alphaSlider.style('width', '250px');
}
  
function draw() {
  lerpedColor = lerpColor(fromColor, toColor, alphaSlider.value() / 100);
  
  fill(fromColor);
  rect(30, 30, 50, 100);
  
  fill(lerpedColor);
  rect(170, 30, 50, 100);
  
  fill(toColor);
  rect(310, 30, 50, 100);
}

Output:
lerping-slider

Online editor: https://editor.p5js.org/

Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/

Reference: https://p5js.org/reference/#/p5/lerpColor

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