how to block a rectangle from going off screen p5

To block a rectangle from going off the screen in p5, you can follow these steps:

Declare variables: First, declare variables to store the position and size of the rectangle. For example, you can use variables like rectX, rectY, rectWidth, and rectHeight.
Set initial position and size: Assign initial values to the variables declared in the previous step. This will determine the initial position and size of the rectangle on the screen.
Update position and size: In the draw function, update the position and size of the rectangle using the variables declared earlier. You can use the rect() function provided by p5 to draw the rectangle on the screen.
Limit the position: To prevent the rectangle from going off the screen, use conditional statements to check if the position of the rectangle exceeds the screen boundaries. For example, you can use if statements to check if rectX is less than 0 or greater than the width of the screen, and if rectY is less than 0 or greater than the height of the screen.
Adjust the position: If the rectangle's position exceeds the screen boundaries, adjust its position accordingly. For example, if rectX is less than 0, set it to 0. If rectX is greater than the width of the screen minus the rectangle's width, set it to the width minus the rectangle's width. Apply the same logic for rectY and the height of the screen.
Redraw the rectangle: After adjusting the position, redraw the rectangle using the updated values. This will ensure that the rectangle stays within the screen boundaries.

By following these steps, you can block a rectangle from going off the screen in p5.