Pascal sets and strings are exposed to C++ using classes that have the same memory layout as the values the Pascal compiler creates). _published section in classes, _property declarations, _fastcall calling convention that is Delphi-compatible, _delegate types for pointers to object instance methods, etc) and the runtime and library are written with some internal representation in mind (e.g. In C++ Builder the VCL is written in Object Pascal (and it even includes a Pascal compiler and linker), the language has been extended considerably to support Object Pascal-isms (e.g. Now, LCL would be very hard to port to C++ because it is really built around Object Pascal features like a rich RTTI with explicitly exported properties, component streaming, "default" accessors, enums, sets, object instance method pointers and other features that C++ does not support at a language level. With that in mind and considering the context i guess you meant LCL.
#Free pascal tcolor install
FPGUI uses FCL but not LCL) and if you install just Free Pascal you only get FCL, not LCL. In FPC 3.2.0+ defines some other constants for w3c colors in System.Note that the Free Pascal/Lazarus equivalent to VCL is two libraries: FCL and LCL, with the former being part and developed by the developers of Free Pascal and the latter being part and developed by the developers of Lazarus (while there is an overlap, they are two different projects with different teams). To convert TColor to a nice string like "clNavy" or "$AA0002":Ĭonvert TColor to/from HTML string #rrggbbĪbout 20 predefined color constants are provided, which are Delphi-compatible: The Graphics unit provides the following functions:įunction Blue ( rgb : TColor ) : BYTE // does not work on system color function Green ( rgb : TColor ) : BYTE // does not work on system color function Red ( rgb : TColor ) : BYTE // does not work on system color function RGBToColor ( R, G, B : Byte ) : TColor procedure RedGreenBlue ( rgb : TColor out Red, Green, Blue : Byte ) // does not work on system color function FPColorToTColor ( const FPColor : TFPColor ) : TColor function TColorToFPColor ( const c : TColor ) : TFPColor // does not work on system color function IsSysColor ( AColor : TColorRef ) : Boolean Convert TColor to/from stringįunctions to convert strings like "25500" or " $AA0088" or "clNavy" to TColor:
The LCL can also work with the fpImage system which uses the TFPColor type (which is RGBA (4x16bit), not RGB (3x8bit) like TColor).Ĭonversions between TColor and RGB values TColor can represent either an RGB (3x8bit) value, or a system color like clDefault. In the LCL TColor is the standard color type. Lazarus hasn't caught on yet, because the current Lazarus versions still support 3.0.x.
#Free pascal tcolor code
Since FPC 3.2.0, Free Pascal defines TColor and TColorRec as well as the 140 standard Color names in the Delphi compatible System.UItypes unit, to allow non visual code to use the same type as visual code. 4 Drawing theme elements on your custom controls.
3.4 Finding the rgb values of a system color.1.3 Convert TColor to/from HTML string #rrggbb.1.1 Conversions between TColor and RGB values.
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