How to move an object using keyboard.

[Juanjo Marín]

Hello. My name is Juanjo, I am from Majorca (Spain) and I find GlowScript VPython really useful when teaching Physics and Computational Science.

The problem  have is: How to handle keyboard with GlowScript. I have read information and examples in 'help' section but, I am unable to fully understand it.

i.e.:

How is the code for moving a rectangle (plane) with the arrows keys?? (any other keys are also welcome).

Thanks for your help!

Best regards.
Juanjo.

[Aaron Titus]

Hi Jaunjo,

My “Physics for Video Games” course uses keyboard interactions. The chapter that introduces this topic is posted at:

https://atitus.trinket.io/phy-1-20-0-physics-for-video-games#/09-program-keyboard-interactions/program-keyboard-interactions

A simple example is at:

http://www.glowscript.org/#/user/Aaron_Titus/folder/physics-for-video-games/program/GAME-Shoot-the-Balls-v1

A second example is at:

http://www.glowscript.org/#/user/Aaron_Titus/folder/physics-for-video-games/program/GAME-Shoot-the-Balls-v2

You will need code similar to this:

def keyboard(event):

    if event.type=='keydown':

        k = event.which

#        print(k)

        if k == 39:

            shooter.v=2*vector(1,0,0)

        elif k == 37:

            shooter.v=2*vector(-1,0,0)

        elif k == 65:

            shooter.v=4*vector(-1,0,0)

        elif k == 83:

            shooter.v=4*vector(1,0,0)

        elif k==32:

            bullet=sphere(pos=shooter.pos, radius=0.1, color=color.white)

            bullet.v=3*vector(0,1,0)

            bulletsList.append(bullet)

        else:

            shooter.v=vector(0,0,0)

       

scene.bind('keydown', keyboard) 

The scene.bind command connects an event (like keydown) to a function (mine was called keyboard). Then, in that function, you write code for different events and keys. Use a print statement to figure out the integer for a particular key.

Aaron

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[Bruce Sherwood]

Otro ejemplo -- Aquí un programa que muestra el nombre de la tecla:

 

box()

 

def keyInput(evt):

    s = evt.key

    print('['+s+']')

 

scene.bind('keydown', keyInput)

 

Usando este programa, se ve que los nombres de las teclas con flechas son “left”, “right”, “up”, y “down”, así que se puede mover la caja con este programa:

 

b = box()

 

def keyInput(evt):

    s = evt.key

    if s == 'left':

        b.pos.x = b.pos.x - 1

    elif s == 'right':

        b.pos.x = b.pos.x + 1

    elif s == 'down':

        b.pos.y = b.pos.y - 1

    elif s == 'up':

        b.pos.y = b.pos.y + 1

 

scene.bind('keydown', keyInput)