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p5.js | bezierVertex() Function
  • Last Updated : 25 May, 2020

The bezierVertex() function in p5.js is used to specify the vertex coordinates used to draw a bezier curve. Every call to this function defines the position of two control points and one anchor point of the bezier curve. This function can only be used between beginShape() and endShape(). It must be prefaced with a call to the vertex() function to set the first anchor point, when called with beginShape() for the first time.

The function expects 6 parameters in 2D mode and 9 parameters (which includes z coordinates) in 3D mode. Both the 2D and 3D modes can be used for drawing in the WebGL mode.

Syntax:

bezierVertex( x2, y2, x3, y3, x4, y4 )

OR

bezierVertex( x2, y2, z2, x3, y3, z3, x4, y4, z4 )

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



  • x2: It is a number that specifies the x-coordinate of the first control point.
  • y2: It is a number that specifies the y-coordinate of the first control point.
  • x3: It is a number that specifies the x-coordinate of the second control point.
  • y3: It is a number that specifies the y-coordinate of the second control point.
  • x4: It is a number that specifies the x-coordinate of the anchor point.
  • y4: It is a number that specifies the y-coordinate of the anchor point.
  • z2: It is a number that specifies the z-coordinate of the first control point. It is used for the WebGL mode.
  • z3: It is a number that specifies the z-coordinate of the second control point. It is used for the WebGL mode.
  • z4: It is a number that specifies the z-coordinate of the anchor point. It is used for the WebGL mode.

The examples below illustrates the bezierVertex() function in p5.js:

Example 1:




function setup() {
  createCanvas(500, 200);
  textSize(16);
}
  
function draw() {
  background("green");
  fill("black");
  text("The bezier below is made using bezierVertex() function in Canvas", 10, 20);
  
  // Define the points
  // First Anchor Point
  let p1 = { x: 50, y: 150 };
  
  // First Control Point
  let p2 = { x: 140, y: 50 };
  
  // Second Control Point
  let p3 = { x: 400, y: 50 };
  
  // Anchor Point
  let p4 = { x: 400, y: 150 };
  
  noFill();
    
  // Start the bezier
  beginShape();
  
  // Specify the first anchor point
  vertex(p1.x, p1.y);
  
  // Specify the other points for bezierVertex()
  bezierVertex(p2.x, p2.y, p3.x, p3.y, p4.x, p4.y);
  endShape();
}

Output:

bezierVertex_canvas

Example 2:




let newFont;
  
function preload() {
  newFont = loadFont("fonts/Montserrat.otf");
}
  
function setup() {
  createCanvas(500, 200, WEBGL);
  textFont(newFont, 14);
}
  
function draw() {
  background("green");
  fill("black");
  text("The bezier below is made using bezierVertex() function in WebGL", -245, -75);
  
  // Define the points
  // First Anchor Point
  let p1 = { x: -200, y: -75, z: 0 };
  
  // First Control Point
  let p2 = { x: 200, y: 150, z: 10 };
  
  // Second Control Point
  let p3 = { x: 100, y: -10, z: 10 };
  
  // Anchor Point
  let p4 = { x: -175, y: 75, z: 10 };
  
  noFill();
  
  // Start the bezier
  beginShape();
  
  // Specify the first anchor point
  vertex(p1.x, p1.y, p1.z);
  
  // Specify the other points for bezierVertex()
  bezierVertex(p2.x, p2.y, p2.z, p3.x, p3.y, p3.z, p4.x, p4.y, p4.z);
  endShape();
}

Output:

bezierVertex_webgl

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/bezierVertex

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