Text issue

Scripting Issues
1

Hi everyone,

I’m realy new to Panda3d and to Python. I’m trying to make a animation at the beginning of my game saying “blablabla entertainment presents”.

I want the text to be black(invisible on the black background) and slowly become white. Also, I want the text to become bigger or smaller. And also a starting point and a ending point.

I know it’s a lot of things at the same time so I started with the color change.

Here is my code, I don’t know if I use the good way to do this kind of things but anyway it doesn’t work. (See error below code)

Code:

import direct.directbase.DirectStart 
from direct.task import Task 
from pandac.PandaModules import *     
from direct.gui.DirectGui import *    
                                      
import sys

class World:                          
  def __init__(self):                 
    text = TextNode('company') 
    text.setText("blablabla Entertainment Presents") 
    textNodePath = aspect2d.attachNewNode(text) 
    textNodePath.setScale(0.1) 
    #text color
    text.setTextColor(1, 1, 1, 1) 
    #text shadow
    text.setShadow(0.1, 0.1) 
    text.setShadowColor(1, 0, 0, 1)
    #text centered
    text.setAlign(TextNode.ACenter) 
    #text position
    #???
    indice = 0
  
    base.setBackgroundColor(0, 0, 0)
    base.disableMouse()

    #Task to move the camera 
    def ChangeColorTask(task): 
        indice = indice + 0.01
 
        text.setTextColor(1,1,1,1) 
        if task.time < 2.0: 
            return Task.cont 
        print 'Done'
        return Task.done 

    taskMgr.add(ChangeColorTask, "ChangeColorTask") 


w = World()
run()

The error is:
File “welcome.py”, line 30, in ChangeColorTask
indice = indice + 0.01
UnboundLocalError: local variable ‘indice’ referenced before assignment

So, maybe the method I use is not the right one! Please help me :slight_smile:

Thanks!!

Jaff

2

Panda has powerful interval classes, why don’t you use them ?

from pandac.PandaModules import *
import direct.directbase.DirectStart
from direct.interval.IntervalGlobal import *
from direct.gui.OnscreenText import OnscreenText
import sys

def pingpongIval(ival,wait=0):
    return Sequence(
              ival,  # play interval normally (forward)
              Wait(wait),  # delay it for a while before playing it backward
              Func(ival.start,0,ival.getDuration(),-1),  # play interval backward
              Wait(ival.getDuration())  # wait until the backward playback finishes
              )

def playIntroMovie():
    OnscreenText( 'Where is your movie ?\nPlay it !', fg=(1,1,1,1), shadow=(1, 0, 0, 1) )

base.setBackgroundColor(0, 0, 0)
dev = OnscreenText( 'XYZ  Entertainment\npresents',
                    scale=.1, fg=(1,1,1,1), shadow=(1, 0, 0, 1),
                    )
duration=2
devFadeIval = dev.colorScaleInterval(duration,Vec4(1,1,1,1),startColorScale=Vec4(1,1,1,0),blendType='easeOut')
devGrowIval = dev.scaleInterval(duration,1.2,blendType='easeOut')
devAllIvals = Parallel( devFadeIval,devGrowIval )  # change SCALE and COLOR SCALE concurently

# now play the Parallel forward and backward (pingpong), and then I'd like to play a movie
Sequence(
         pingpongIval(devAllIvals,wait=.5),  # do pingpong play with .5 second delay
         Func(playIntroMovie),
         ).start()

    
run()

In there, I change the alpha instead. I also add a delayed pingpong method, since there is no built-in one.

About your indice, it belongs locally to init, not ChangeColorTask.

3

Thanks man!

I will try that during the weekend!

Do you have a suggestion to get the text moving?(Because as I can see, in your code you can change the scale and the color, but not the position).

Thanks again!

Jaff

4

Sure, try out the posInterval.
Or, if that does not give you enough control, you can always try the LerpPosInterval.

5

Ok so I try your code, it works perfect and I think I understand 95% of it. Now I want to do a big beginning with like the producer, actor, etc… So a lot of text, each with a animation. I try with 2 text, as you will see in my code below. It works but I was wondering if there was a way to create a “general function” so that I don’t need to create 99999 variables like texte1 and texte2, etc… I tried to reasign a value in texte1 but it doesn’t work. Also, when I start the code below, the second text appear in front of the first … Please help :slight_smile:

from pandac.PandaModules import *
import direct.directbase.DirectStart
from direct.interval.IntervalGlobal import *
from direct.gui.OnscreenText import OnscreenText
import sys


class Presentation:
 
    texte1 = OnscreenText('Dark Rage Entertainment', scale=.1, fg=(1,1,1,1), shadow=(0,0,0,1),)
    texte2 = OnscreenText('Presents', scale=.2, fg=(1,1,1,1), shadow=(0,0,0,1),)
    duration = 4 
        
    #Cette fonction exécute une séquence à l'endroit et ensuite à l'envers.
    def pingpongIval(ival, wait=0):
        return Sequence(
                    ival, 
                    Wait(wait),
                    Func(ival.start, 0, ival.getDuration(),-1),
                    Wait(ival.getDuration())
                    )
    
    base.setBackgroundColor(0,0,0)

    texte1FadeIval = texte1.colorScaleInterval(duration, Vec4(1,1,1,1), startColorScale=Vec4(1,1,1,0), blendType='easeOut')
    texte1GrowIval = texte1.scaleInterval(duration, 1.2, blendType='easeOut')
    texte1AllIvals = Parallel(texte1FadeIval, texte1GrowIval)
    
    texte2FadeIval = texte2.colorScaleInterval(duration, Vec4(1,1,1,1), startColorScale=Vec4(1,1,1,0), blendType='easeOut')
    texte2GrowIval = texte2.scaleInterval(duration, 1.2, blendType='easeOut')
    texte2AllIvals = Parallel(texte2FadeIval, texte2GrowIval)
        
    #now play the parallel forward and backward (pingpong) and then I'dlike to play a movie
    Sequence(
                 pingpongIval(texte1AllIvals, wait=1.5),
                 pingpongIval(texte2AllIvals, wait=1.5)
                 ).start()
             
w = Presentation()                

run()

Thank you for your help and you patience!

Jaff

P.S: Sorry for the commentaries, they are in french!

6

Of course the 2nd appears in front because it’s created later than the 1st. Before playing any of the text interval, each one must be hidden first.
How about this :

from pandac.PandaModules import *
import direct.directbase.DirectStart
from direct.interval.IntervalGlobal import *
from direct.gui.OnscreenText import OnscreenText
import sys


class Presentation:

    def __init__(self):
        base.setBackgroundColor(0,0,0)
        fadeDuration = 2
        texts=(
              OnscreenText('Dark Rage Entertainment', scale=.1, fg=(1,1,1,1), shadow=(0,0,0,1),),
              OnscreenText('Presents', scale=.2, fg=(1,1,1,1), shadow=(0,0,0,1),),
              OnscreenText('TEXT 1', scale=.05, fg=(1,1,1,1), shadow=(0,0,0,1),),
              OnscreenText('TEXT 2', scale=.05, fg=(1,1,1,1), shadow=(0,0,0,1),),
              OnscreenText('TEXT 3', scale=.05, fg=(1,1,1,1), shadow=(0,0,0,1),),
              OnscreenText('END_OF_TEXT', scale=.05, fg=(1,1,1,1), shadow=(0,0,0,1),),
              )
        devIval = self.createFadeInGrowTexts(texts,fadeDuration,textSwitchDelay=.75)
        devIval.start()

    #Cette fonction exécute une séquence à l'endroit et ensuite à l'envers.
    def pingpongIval(self,ival, wait=0):
        return Sequence(
                    ival,
                    Wait(wait),
                    Func(ival.start, 0, ival.getDuration(),-1),
                    Wait(ival.getDuration())
                    )

    def createFadeInGrowTexts(self,texts,fadeDuration,textSwitchDelay=0):
        seq = Sequence()
        for texte in texts:
            texte.hide()
            fadeInGrow = Parallel(
                            texte.colorScaleInterval(fadeDuration, Vec4(1,1,1,1), startColorScale=Vec4(1,1,1,0), blendType='easeOut'),
                            texte.scaleInterval(fadeDuration, 1.2, blendType='easeOut')
                            )
            seq.append( Sequence(
                           Func(texte.show),
                           self.pingpongIval(fadeInGrow, wait=1.5),
                           Func(texte.destroy),
                           Wait(textSwitchDelay),  # <---- give some delay between text
                           )
                      )
        return seq


w = Presentation()

run()

You could use any number of text by adding them to texts.

7

Thanks again!

That’s exactly what I was looking for being an oriented object freak and reusability fanatic! This simple example will help me a lot understand the python and panda3d.

Have a great day!

Jaff