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POI'm trying to time how long a key is held down using vPython
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  1. POI'm trying to time how long a key is held down using vPython
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    copied!<p>I'm writing a program for my physics final. Throughout the semester we have used vPython to model situations and get exact answers, etc. Our final project is to create a game using vPython that includes some type of physics.</p> <p>I chose to remake Bowman except with tanks. So you have a tank on the right hand of the screen and left hand of the screen with a wall in the middle. The object is to aim your cannon and shoot the right velocity to hit your opponent's tank. I have the a good chunk of the program complete however I am stuck on a few different things.</p> <p>First, how can I time a keystroke? I have it so I shoot from the each cannon however I want to be able to hold down a key and dependent on how long it's held down for the faster the initial velocity will be.</p> <p>Second, where would I incorporate gravity into the program? I have a general idea of how to but I just don't know which function to put it into.</p> <p>Lastly, I have a wall height being generated randomly each time the program is run. However sometimes the wall is so small you can't see it. Is there a way I can set a range of values for this?</p> <p>Here is my code:</p> <pre><code>from visual import* from random import* scene.autoscale=False scene.width = 1500 scene.height = 800 scene.title='Tanks' def moveaup(gun): theta=arctan(gun.axis.y/gun.axis.x) dtheta=.1 if (theta&lt;pi/2): theta=theta+dtheta if not (theta&gt;pi/2): gun.axis=(cos(theta),sin(theta),0) else: gun.axis=vector(0,1,0) def moveadown(gun): theta=arctan(gun.axis.y/gun.axis.x) dtheta=.1 if (theta&gt;0): theta=theta-dtheta gun.axis=(cos(theta),sin(theta),0) def movebup(gun): theta=arctan(gun.axis.y/gun.axis.x)+pi dtheta=.1 if (theta&gt;pi/2): theta=theta-dtheta if not (theta&lt;pi/2): gun.axis=(cos(theta),sin(theta),0) else: gun.axis=vector(0,1,0) def movebdown(gun): theta=arctan(gun.axis.y/gun.axis.x)+pi dtheta=.1 if (theta&lt;pi): theta=theta+dtheta gun.axis=(cos(theta),sin(theta),0) def shoota(gun): vel = vector(1,1,0) bullet = sphere(pos=(gun.pos.x+gun.axis.x,gun.pos.y+gun.axis.y,0),radius=(.0785),color=color.yellow) bullet.v = vector(0,0,0) bullet.v = bullet.v+vel bulletlist.append(bullet) def shootb(gun): vel = vector(-1,1,0) bullet = sphere(pos=(gun.pos.x+gun.axis.x,gun.pos.y+gun.axis.y,0),radius=(.0785),color=color.green) bullet.v = vector(0,0,0) bullet.v = bullet.v+vel bulletlist.append(bullet) def bulletlistupdate(bulletlist): dt=.01 for a in bulletlist: a.pos=a.pos+a.v*dt def checks(agun,bgun): if scene.kb.keys: key=scene.kb.getkey() if key=='a': moveaup(agun) if key=='s': moveadown(agun) if key=='l': movebup(bgun) if key=='k': movebdown(bgun) if key=='d': shoota(agun) if key=='j': shootb(bgun) #enviroment ground = box(pos=(0,-8,0),size=(50,5,0),color=color.red) wall = box(pos=(0,-8,0),size=(.25,20*random(),0),color=color.red) #playerA abody = box(pos=(-11,-5.25,0),size=(.5,.5,0),color=color.blue) agun = cylinder(pos=(-11,-5.1,0),axis=(.8,.8,0),radius=(.08),color=color.blue) #playerB bbody= box(pos=(11,-5.25,0),size=(.5,.5,0),color=color.yellow) bgun = cylinder(pos=(11,-5.1,0),axis=(-.8,.8,0),radius=(.08),color=color.yellow) bulletlist = [] while True: rate(1000) checks(agun,bgun) bulletlistupdate(bulletlist) </code></pre> <p>Any and all help is welcome!</p> <p>Thanks much!</p>
 

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