Curling Game

Scripting Issues
1

Hi, i’m a student from Brazil, and i’m learning Panda3D. I’m trying to make a Curling game (for those who doesn’t know, it’s that game which you play with granite stones and your goal is to get the closest to a target), but I’m having some problems here.

1 - I have a static model that i want to shoot in the Y axis pressing the space key.
self.accept(“space”, self.setKey, [“shoot”,1])
self.accept(“space-up”, self.setKey, [“shoot”,0])

it’s working fine if i hold space, but if I stop holding, the model stops too (obviously ^^), does anyone know a way to press the key just one time and the model goes up?

2 - I will apply a friction force so that the model can stop going Y for the eternity. Does Panda has a library for this?

I’m starting to get crazy with this @_@ If anyone can help me, I would be grateful.

2

  1. Well, then just remove the second line :slight_smile:

  2. Panda has a Physics library, yes. But for something as simple as this, I would rather just decrease the speed every frame, or so.

3

Woah, just that? I was worried that maybe I could not restart the value, but I think I understood now \o/. And about the friction, to decrease the speed I have to use a task for this? Because I’m not pretty sure how to use them yet =/

4

Well, I’d need to see your code to see how you move the thing at all, before I can say how to implement friction.

5

this is the code, it is PRETTY basic.

class Game(DirectObject):
    def __init__(self):
        self.text = genLabelText("Curling", -1, 0.95, 1, 1, 1, 1, 0.07)
        
        # Desabilitar camera e posiciona-la 
        self.setupGame()
        
        # Carregar os Modelos
        self.loadModel()
        
        # Setar os controles
        self.setKeyboardControl()
        

    def setupGame(self):
        base.disableMouse()
        base.camera.setPos(0, 50, 3)
        base.setBackgroundColor(0.3, 0.5, 0.5)
        
        self.previousTime = 0

    def setKeyboardControl(self):
        self.keyMap = {"left":0, "right":0, "shoot":0}

        self.accept("escape", sys.exit)
        self.accept("a", self.setKey, ["left",1])
        self.accept("d", self.setKey, ["right",1])
        self.accept("space", self.setKey, ["shoot",1])
        self.accept("a-up", self.setKey, ["left",0])
        self.accept("d-up", self.setKey, ["right",0])
        #self.accept("space-up", self.setKey, ["shoot",0])
        
        taskMgr.add(self.move,"moveFunc")

    def setKey(self, key, value):
        self.keyMap[key] = value
       
    def forceBar (self):
        self.force = 50
        
    def loadModel(self):
        self.staticModel = loader.loadModel("bunny")
        self.staticModel.reparentTo(render)
        self.staticModel.setPos(-1, 15, 0)
        
        #base.camera.reparentTo(self.staticModel)
        base.camera.setPos(0, -50, 100)
        base.camera.setP(base.camera.getP() + 15)
        #lookAt faz a camera olhar para o persongaem
        base.camera.lookAt(self.staticModel)
        
        self.env = loader.loadModel("environment")
        self.env.reparentTo(render)
        self.env.setScale(0.25,0.25,0.25)
        self.env.setPos(0, 20, 0)
        
    def move(self, task):
        
        elapsedTime = task.time - self.previousTime
        self.dontStop = False
        self.contador = 0
        if (self.keyMap["left"] != 0):
            self.staticModel.setPos(self.staticModel.getX() - elapsedTime * 15, self.staticModel.getY(), 0)
            #base.camera.setPos(base.camera.getX() - elapsedTime * 15, base.camera.getY(), 40)
            #base.camera.lookAt(self.staticModel)
            #base.camera.setPos(base.camera.getX() - elapsedTime * 15, base.camera.getY(), 0)
        if (self.keyMap["right"] !=0 ):
            self.staticModel.setPos(self.staticModel.getX() + elapsedTime * 15, self.staticModel.getY(), 0)
            base.camera.setPos(self.staticModel.getX() + elapsedTime * 15, base.camera.getY(), 40)
            #base.camera.lookAt(self.staticModel)
        if (self.dontStop == False):
            if (self.keyMap["shoot"] !=0):
                self.contador = 1
            
        if (self.contador == 1):
            #self.dontStop = True
            self.staticModel.setPos(self.staticModel.getX(), self.staticModel.getY() + elapsedTime * self.force, 0)
            #base.camera.setPos(self.staticModel.getX() + elapsedTime * 15, self.staticModel.getY(), 0)
            base.camera.lookAt(self.staticModel)
            
        self.previousTime = task.time
        return Task.cont
6

I see you’re already using a task. :slight_smile:
Something like this:

  1. Initialize self.force in the init, for example by calling self.forceBar.
  2. In the task, call self.force *= 0.9 or so. Making the 0.9 value to something like 0.8 will increase the friction, while 0.99 would increase friction.
7

Okay, I will try it here. Thanks for the help ^^

8

Hi, it’s me again, with the same problem, unfortunately…I have this code:

class Game(DirectObject):
def init(self):
self.text = genLabelText(“Curling”, -1, 0.95, 1, 1, 1, 1, 0.07)

    self.setupGame()
    
    self.loadModel()
    
    self.setKeyboardControl()
    
    taskMgr.add(self.moveBall,"ballFunc")

def setupGame(self):
    base.disableMouse()
    base.camera.setPos(0, 50, 3)
    base.setBackgroundColor(0.3, 0.5, 0.5)
    
    self.previousTime = 0
    
    self.dontStop = False

def setKeyboardControl(self):
    self.keyMap = {"left":0, "right":0, "shoot":0}

    self.accept("escape", sys.exit)
    self.accept("a", self.setKey, ["left",1])
    self.accept("d", self.setKey, ["right",1])
    self.accept("space", self.setKey, ["shoot",1])
    self.accept("a-up", self.setKey, ["left",0])
    self.accept("d-up", self.setKey, ["right",0])
    self.accept("space-up", self.setKey, ["shoot",0])
    
    taskMgr.add(self.move,"moveFunc")

def setKey(self, key, value):
    self.keyMap[key] = value
    
def loadModel(self):
    self.staticModel = loader.loadModel("bunny")
    self.staticModel.reparentTo(render)
    self.staticModel.setPos(-1, 15, 0)
    
    base.camera.setPos(0, -50, 100)
    base.camera.setP(base.camera.getP() + 15)
    base.camera.lookAt(self.staticModel)
    
    self.env = loader.loadModel("environment")
    self.env.reparentTo(render)
    self.env.setScale(0.25,0.25,0.25)
    self.env.setPos(0, 20, 0)
    
def move(self, task):
    elapsedTime = task.time - self.previousTime
    
    self.contador = 0
    if (self.keyMap["left"] != 0):
        self.staticModel.setPos(self.staticModel.getX() - elapsedTime * 15, self.staticModel.getY(), 0)
        base.camera.lookAt(self.staticModel)
    if (self.keyMap["right"] != 0):
        self.staticModel.setPos(self.staticModel.getX() + elapsedTime * 15, self.staticModel.getY(), 0)
        base.camera.lookAt(self.staticModel)
        
    if (self.keyMap["shoot"] != 0):
        self.dontStop = True
        
    self.previousTime = task.time
    return Task.cont
    
def moveBall (self, task):
    self.friction = 0.9
    self.speedInit = 10
    #self.speedFinal = self.speedInit - self.friction
    
    if (self.dontStop == True):
        self.speedFinal = self.speedInit - self.friction 
        self.staticModel.setPos(self.staticModel.getX(), self.staticModel.getY() - self.speedFinal, 0)
        base.camera.lookAt(self.staticModel)
        print self.speedFinal
        if (self.speedFinal <= 0):
            self.dontStop = False
    
    return Task.cont

According to my teacher, this is correct, but I can’t make the friction works…The model just keep going up with the same velocity…I tried to use this: while ( self.speedFinal < 0): , but I only get an infinity loop =P. Does anyone knows what I’m doing wrong?

9

I’m at work, so I don’t have time right now to properly read all ur code but at a glance I’d say this may help:

Say your friction is set to 0.9. Each frame I’d want to be doing currentspeed *= friction, not currentspeed -= friction.

Maybe that will help.

Code tags will also help :wink: