Js mouse event mousex3/31/2023 Inside the draw function (which is called 60 times per second), this code checks the mouseIsPressed variable and draws a small cyan circle under the mouse if it is. Here’s an example that uses the mouseX and mouseY variables inside the mouseClicked function: Inside an event function, you can use the same variables and functions as you can in the draw function. The program turns blue when the user drags their mouse.Ĭombining Input Variables and Event Functions When the user presses their mouse, it turns green, and then turns yellow when the user releases their mouse. Here’s an example that defines mousePressed, mouseReleased, and mouseDragged functions to change the background color: If you need to know which mouse button is pressed, check out the mouseButton variable.mouseWheel() is called when you scroll with the mouse wheel.mouseDragged() is called, you guessed it, whenever the mouse is moved while its button is pressed.mouseMoved() is called whenever the mouse moves.mouseClicked() is called when the mouse is clicked.mouseReleased() is called once when the user releases the mouse button. mousePressed() is called once when the user presses the mouse button.There are a bunch of mouse input functions that allow you to react to more specific events. By writing code inside these functions, you can run code when these events happen. These one-time inputs are called events, and p5.js provides a bunch of functions that it automatically calls whenever an event happens. But what if you want to detect one-time input like a mouse click? The mouseIsPressed variable is useful when you want to do something continuously, as long as the user has the mouse pressed. This works because the code does not call the background function from the draw function, so new circles are drawn on top of old circles. In other words, the program lets you draw with circles whenever the mouse is pressed. If it is, then it draws a circle at mouseX,mouseY. This program uses an if statement to check whether mouseIsPressed is true. You can combine the mouseIsPressed variable with the mouseX and mouseY variables to create a drawing program: In other words, the program displays gray unless the mouse is pressed, then it displays green. If it is, then it draws a green background. You can use the mouseIsPressed variable in an if statement to do stuff when the mouse is held down: Similarly, the mouseIsPressed variable points to a boolean value that’s true when the mouse is pressed, and false when it’s not. The mouseX and mouseY variables point to number values that hold the current position of the mouse. This program draws a circle wherever the mouse cursor is. p5.js automatically updates these variables, so you can use them in the draw function to get the position of the mouse. P5.js provides mouseX and mouseY variables that hold the current location of the mouse cursor in the window. Mouse Input The mouseX and mouseY Variables This tutorial shows you how to get user input (things like mouse position, mouse clicks, and keyboard typing) to make your programs more interactive. So far your programs have mostly done stuff on their own, without responding to anything that the user does. You also know that p5.js automatically calls the setup function once at the very beginning of the program, and then calls the draw function 60 times per second. You also know how to modify variables over time to create animations, and you’ve seen that p5.js gives you predefined variables like width and height. Now you know how to call functions, use variables, create functions, and use if statements.
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