How to Draw Rectangles Inside A Polygon Using P5.js?

To draw rectangles inside a polygon using p5.js, you can start by defining the points that make up the polygon using the beginShape() and endShape() functions. Once you have the points of the polygon defined, you can use the rect() function to draw rectangles inside the polygon. To ensure that the rectangles are only drawn inside the polygon, you can use the pointInPolygon() function to check if a particular point is inside the polygon before drawing a rectangle at that point. By looping through all the points inside the polygon and checking if they are inside the polygon, you can draw rectangles inside the polygon using p5.js.

How to draw rounded rectangles inside a polygon in p5.js?

You can achieve this by first drawing the rounded rectangle and then using the clip() function to limit the drawing of the rectangle only within the boundaries of the polygon. Here's an example code to demonstrate this in p5.js:

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function setup() {
  createCanvas(400, 400);
}

function draw() {
  background(220);

  // Create a polygon
  let vertices = [
    createVector(200, 100),
    createVector(300, 200),
    createVector(200, 300),
    createVector(100, 200)
  ];

  beginShape();
  for (let vertex of vertices) {
    vertex(vertex.x, vertex.y);
  }
  endShape(CLOSE);

  // Draw a rounded rectangle
  let x = 150;
  let y = 150;
  let w = 100;
  let h = 100;
  let r = 20;
  
  noFill();
  stroke(0);
  strokeWeight(2);
  
  clipPolygon(vertices);
  rect(x, y, w, h, r);
}

function clipPolygon(vertices) {
  beginShape();
  for (let vertex of vertices) {
    vertex(vertex.x, vertex.y);
  }
  endShape(CLOSE);
  clip();
}

In this code, we first define a polygon using createVector for the vertices and then draw it using beginShape() and endShape(CLOSE). Next, we draw a rounded rectangle using the rect() function. Finally, we use the clipPolygon() function to clip the drawing of the rounded rectangle within the boundaries of the polygon.

What is the function used to draw rectangles in p5.js?

The function used to draw rectangles in p5.js is rect().

What is the role of the background() function in p5.js?

The background() function in p5.js is used to set the background color of the canvas or to clear the canvas and redraw it with a new background color.

It takes one or more parameters to specify the color of the background. This can be done by passing in a grayscale value, a color using the color() function, or by specifying the red, green, and blue components individually.

The color specified with background() will be used to clear the canvas before any other drawing commands are executed. This function is typically called at the beginning of the draw loop to reset the canvas for the next frame.