Steema Central

What are some of the issues / bugs that come up when using GDI with TChart?

Also, I can't seem to find the source code for the GDI example that is provided in the download section. Thanks for your help, Golli.

Hi Golli,

There are still some outstanding issues reported with implementing the GDI+ Canvas for general use but it does function well for most Chart applications.

We have been reported those problems TeeChart with GDI+:

• 1.- Text Angle is ignored.
  2.- Pen Style and Mode properties are not working.
  3.- Brush Bitmap property is ignored (texture is really important thing!).
  4.- Transparency property is not really transparent, is opaque (tested for Walls).
  5.- When using Gradient Style gdRadial the Chart is not drawing correctly, only the part of it is visible.
  6.- Shadow.HorizSize and Shadow.VertSize are incompatible with TPieSeries, it turns out truncated.
  7.- Sometimes the lines connect bars and their marks are not visible (only the first line is showing).
  8.- Grid Lines must be dotted, not solid.
  9.- Pie charts are no satisfactorily rounded.
  10.- There's no Z order rendering for Point3D series using GDI canvas. Must use OpenGL to obtain 3D hidden lines.

Regarding the demo, you should find its sources using TeeChart's binary installers. The demo sources can be found at, i.e.: C:\Program Files\Steema Software\TeeChart 707 for Delphi 7\Examples\GDIPlus