One font, two sizes [SOLVED]

Scripting Issues
1

In a gui (DirectGui) I would want to have text at different sizes, and still keep the text ‘crisp’.

I’m doing something like this:

        self.BigFont = loader.loadFont('font/font1.ttf')
        self.BigFont.setPixelsPerUnit(24)
        self.BigFont.setMinfilter(Texture.FTNearest )
        self.BigFont.setMagfilter(Texture.FTNearest ) 
        self.SmallFont = loader.loadFont('font/font1.ttf')
        self.SmallFont.setPixelsPerUnit(16)
        self.SmallFont.setMinfilter(Texture.FTNearest )
        self.SmallFont.setMagfilter(Texture.FTNearest )

But the pixel-per-unit value for both fonts ends up as 16
Also when I loaded the font some time before (in a different class) then I get an error:

Assertion failed: get_num_pages() == 0 at line 75 of c:\buildslave\release_sdk_w
in32\build\panda3d\panda\src\text\dynamicTextFont.I
Traceback (most recent call last):
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 61, in eventLoop
Task
    self.doEvents()
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 55, in doEvents
    processFunc(self.eventQueue.dequeueEvent())
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 122, in processE
vent
    messenger.send(eventName, paramList)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 397, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 482, in __dispatch
    method (*(extraArgs + sentArgs))
  File "main.py", line 435, in save_and_run
    game=Game(self.loadscreen, self)
  File "C:\scratch\game.py", line 220, in __init__
    self.common['hud']=HUD(self.common)
  File "C:\scratch\hud.py", line 25, in __init__
    self.BigFont.setPixelsPerUnit(24)
AssertionError: get_num_pages() == 0 at line 75 of c:\buildslave\release_sdk_win
32\build\panda3d\panda\src\text\dynamicTextFont.I
:task(error): Exception occurred in PythonTask eventManager
Traceback (most recent call last):
  File "main.py", line 453, in <module>
    run()
  File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 2921, in run
    self.taskMgr.run()
  File "C:\Panda3D-1.8.1\direct\task\Task.py", line 502, in run
    self.step()
  File "C:\Panda3D-1.8.1\direct\task\Task.py", line 460, in step
    self.mgr.poll()
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 61, in eventLoop
Task
    self.doEvents()
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 55, in doEvents
    processFunc(self.eventQueue.dequeueEvent())
  File "C:\Panda3D-1.8.1\direct\showbase\EventManager.py", line 122, in processE
vent
    messenger.send(eventName, paramList)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 397, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Panda3D-1.8.1\direct\showbase\Messenger.py", line 482, in __dispatch
    method (*(extraArgs + sentArgs))
  File "main.py", line 435, in save_and_run
    game=Game(self.loadscreen, self)
  File "C:\scratch\game.py", line 220, in __init__
    self.common['hud']=HUD(self.common)
  File "C:\scratch\hud.py", line 25, in __init__
    self.BigFont.setPixelsPerUnit(24)
AssertionError: get_num_pages() == 0 at line 75 of c:\buildslave\release_sdk_win
32\build\panda3d\panda\src\text\dynamicTextFont.I

Is this a bug? Is there any better way to avoid this then to keep many copies of the same font file with different names?

2

The source code for that assertion is:

  // If this assertion fails, you didn't call clear() first.  RTFM.
  nassertr(get_num_pages() == 0, false);
3

Ok. font.clear() got rid of the assertion.
I had a look at the reference and I found a makeCopy() function, using that I can have two font with different sizes loaded from one font file.

        self.BigFont = loader.loadFont('font/font.ttf')
        self.BigFont.setPixelsPerUnit(24)
        self.BigFont.setMinfilter(Texture.FTNearest )
        self.BigFont.setMagfilter(Texture.FTNearest )         
        self.SmallFont=self.BigFont.makeCopy()        
        self.SmallFont.setPixelsPerUnit(16)