3.2.2 Mouse Press Events and onAppStart Function

What is the purpose of the onAppStart(app) function in the given code example?

• It runs continuously in the background.

• It is called exactly once when the app starts.

• It is used to draw shapes on the screen.

• It handles mouse click events.

In the code example, what values are set for app.rectLeft and app.rectTop in the onAppStart function? Fill in the blank: app.rectLeft is set to ___ and app.rectTop is set to ___.

• A) 50, 100

• B) 100, 200

• C) 200, 300

• D) 0, 50

What is the purpose of the onMousePress function in the given code snippet?

• To draw a rectangle

• To detect mouse clicks and report their location

• To import graphics library

• To start the application.

In the code snippet, the onMousePress function updates the values of app.rectLeft and app.rectTop based on the location of the mouse press. Fill in the blank: The values are updated to _______.

• 100, 200

• mouseX, mouseY

• 50, 50

• 0, 0

What is the purpose of the function def onAppStart(app): in the code?

• It is called every time the mouse is pressed.

• It sets the initial values of app.rectLeft and app.rectTop.

• It draws the rectangle on the screen.

• It clears the canvas.

Fill in the blank: The function def onMousePress(app, mouseX, mouseY): is used to update the position of the rectangle. The variable app.rectLeft is updated to the value of _______.

• mouseX

• mouseY

• app.rectTop

• app.rectLeft

What should you avoid naming your own values in the app object to prevent conflicts with reserved dimensions?

• A) width and height

• B) length and breadth

• C) size and scale

• D) x and y

When using the Autograder with events, it is important to know certain details. Fill in the blank: The Autograder is used to _______ animations.

• create

• autograde

• delete

• modify

A user action (e.g. mouse or key press), are called _____

When an app starts, the function onAppStart(app) is called _______, before anything else happens.

• exactly once
• continuously

• five times

• never