GeUserArea.DrawBitmap() issue

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 25/11/2011 at 09:34, xxxxxxxx wrote:

Hi, I have problems when drawing alpha-containing Bitmaps onto a GeUserArea.

The following code will open a Dialog that displays a bitmap with alpha values. Set SHOW_ISSUE to True and you will see what exactly is the problem. GeUserArea.DrawSetPen() seems to fill the background of the bitmap, but why ? I just can't figure out how to avoid this.

Can you think of possible reasons why this is happening ? Or is it a bug ?
Thank you.

import c4d  
import c4d.gui     as gui  
import c4d.bitmaps as bitmaps  
  
SHOW_ISSUE = False  
  
class Area(gui.GeUserArea) :  
    
  def __init__(self, w = 20, h = 20, r = 1, g = 1, b = 1) :  
      self.bmp = bitmaps.BaseBitmap()  
      self.bmp.Init(w, h)  
      self.w   = w  
      self.h   = h  
        
      self.alpha = self.bmp.AddChannel(True, False)  
        
      r = int(r * 255)  
      g = int(g * 255)  
      b = int(b * 255)  
  
      for x in xrange(w) :  
          for y in xrange(h) :  
              a = x*y / float(w*h)  
              a = 1 - 2**a  
              a = int(a * 255)  
              self.bmp[x, y] = r, g, b  
              self.bmp.SetAlphaPixel(self.alpha, x, y, a)  
                
  def DrawMsg(self, x1, y1, x2, y2, msg) :  
      self.DrawSetPen(c4d.Vector(0, 0, 0))  
      self.DrawRectangle(x1, y1, x2, y2)  
        
      if SHOW_ISSUE:  
          self.DrawSetPen(c4d.Vector(.2, .6, .9))  
        
      w, h = self.w, self.h  
      self.DrawBitmap(self.bmp,  
          0, 0, w, h, 0, 0, w, h, c4d.BMP_NORMAL | c4d.BMP_ALLOWALPHA)  
            
  def GetMinSize(self) :  
      return self.w, self.h  
        
class Dialog(gui.GeDialog) :  
    
  def __init__(self, area) :  
      self.area = area  
    
  def CreateLayout(self) :  
      self.AddUserArea(1000, c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT)  
      self.AttachUserArea(self.area, 1000)  
      return True  
    
def main() :  
  area = Area(100, 100, 1.0, 0.66, 0.24)  
  dlg  = Dialog(area)  
  
  if c4d.GetC4DVersion() < 13000:  
      dlg.Open(c4d.DLG_TYPE_MODAL_RESIZEABLE)  
  else:  
      dlg.Open(c4d.DLG_TYPE_ASYNC)  
    
if __name__ == "__main__":  
  main()

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 27/11/2011 at 06:07, xxxxxxxx wrote:

Does no one know about it ?

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 28/11/2011 at 13:08, xxxxxxxx wrote:

Hi, this is intended. An alternative is the GeClipMap class. With this class you can construct the entire image which can then be drawn to the interface. This class can handle the requirements of your example.
Btw, scripts should better not be used in asynchronous dialogs.

Cheers, Sebastian

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 01/12/2011 at 09:59, xxxxxxxx wrote:

Thank you for taking your time, Sebastian.
But unfortunately, I still can't get it right.
May you show me an example of how to use alpha-bitmaps / GeClipMap s on a GeUserArea ?

I have modified the code above to use a GeClipMap, but I get the same result.

import c4d  
import c4d.gui     as gui  
import c4d.bitmaps as bitmaps  
  
SHOW_ISSUE = False  
  
class Area(gui.GeUserArea) :  
    
  def __init__(self, w = 20, h = 20, r = 1, g = 1, b = 1) :  
      self.bmp = bitmaps.GeClipMap()  
      self.bmp.Init(w, h)  
      self.bmp.BeginDraw()  
      self.w   = w  
      self.h   = h  
        
      r = int(r * 255)  
      g = int(g * 255)  
      b = int(b * 255)  
  
      for x in xrange(w) :  
          for y in xrange(h) :  
              a = (x * 4 / float(w))**(y / float(h))  
              try:  
                  a = 1 / (x**2 / float(w)**2) * a  
              except:  
                  a = 0  
              a = int(a * 255)  
              self.bmp.SetPixelRGBA(x, y, r, g, b, a)  
                
      self.bmp.EndDraw()  
                
  def DrawMsg(self, x1, y1, x2, y2, msg) :  
      self.DrawSetPen(c4d.Vector(0, 0, 0))  
      self.DrawRectangle(x1, y1, x2, y2)  
        
      if SHOW_ISSUE:  
          self.DrawSetPen(c4d.Vector(.2, .6, .9))  
        
      w, h = self.w, self.h  
      self.DrawBitmap(self.bmp.GetBitmap(),  
          0, 0, w, h, 0, 0, w, h, c4d.BMP_NORMAL | c4d.BMP_ALLOWALPHA)  
            
  def GetMinSize(self) :  
      return self.w, self.h  
        
class Dialog(gui.GeDialog) :  
    
  def __init__(self, area) :  
      self.area = area  
    
  def CreateLayout(self) :  
      self.AddUserArea(1000, c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT)  
      self.AttachUserArea(self.area, 1000)  
      return True  
    
def main() :  
  area = Area(100, 100, 1.0, 0.66, 0.24)  
  dlg  = Dialog(area)  
  
  if c4d.GetC4DVersion() < 13000:  
      dlg.Open(c4d.DLG_TYPE_MODAL_RESIZEABLE)  
  else:  
      dlg.Open(c4d.DLG_TYPE_ASYNC)  
    
if __name__ == "__main__":  
  main()

Btw, I don't know if you already noticed, there are some new threads in the Bugs-section. For instance mines [ Script manager R13 bug, GeUserArea disappears in async dialog]