Re: [Lazarus] Vertical String Grid
Hi Graeme, Sounds very interesting, however, I think it is a bit higher than my current coding knowledge. Also, your application looks amazing, what components are you using that aren't installed with the defaul Lazarus install? Also, how long do you think it would take to set a new property onthe StringGrid to have orinetaion: Horizontal or Vertical to make things really easy? Richard On 6 December 2013 06:47, Graeme Geldenhuys gra...@geldenhuys.co.uk wrote: On 2013-12-03 15:12, Richard Mace wrote: Could you give me any hints or example code? You can do whatever painting you want in the OnDrawCell. Combine that with hiding the column titles and grid lines, and pretty much have a blank canvas to paint anything. Google TStringGrid and OnDrawCell. Here are some results: http://forum.lazarus.freepascal.org/index.php?topic=7529.0 http://docwiki.embarcadero.com/CodeExamples/XE4/en/OnDrawCell_%28Delphi%29 http://stackoverflow.com/questions/3540570/delphi-how-to-make-cells-texts-in-tstringgrid-center-aligned Here are some of my own results: http://geldenhuys.co.uk/~graemeg/stringgrid1.png http://geldenhuys.co.uk/~graemeg/stringgrid2.png Regards, Graeme -- fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal http://fpgui.sourceforge.net/ -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] Pointer type handling
Hi, I'm passing a pointer buffer as void * to a C library that returns Uint8 or Uint16 (and signed types). If I explicitly declare the buffer as PByte, PWord, etc. I get exactly what I need, but, I would like to work with an abstract type (for example Pointer) and cast it depending on a flag returned by the library. If I pass a Pointer (instead of a PWord or PByte) and cast it to PWord, for example. I get the same result if I have passed a PByte. How can I handle a situation like this without explicitly define each type?. Regards, -- Leonardo M. Ramé http://leonardorame.blogspot.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Pointer type handling
Leonardo M. Ramé schrieb: Hi, I'm passing a pointer buffer as void * to a C library that returns Uint8 or Uint16 (and signed types). If I explicitly declare the buffer as PByte, PWord, etc. I get exactly what I need, but, I would like to work with an abstract type (for example Pointer) and cast it depending on a flag returned by the library. If I pass a Pointer (instead of a PWord or PByte) and cast it to PWord, for example. I get the same result if I have passed a PByte. How can I handle a situation like this without explicitly define each type?. I'm not sure what you mean. How does your code look like now, and how do you want it to look? You can modify the function declarations in your units, to accept the properly typed pointer or an Var parameter. DoDi -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Pointer type handling
On 2013-12-09 16:24:22 +0100, Hans-Peter Diettrich wrote: Leonardo M. Ramé schrieb: Hi, I'm passing a pointer buffer as void * to a C library that returns Uint8 or Uint16 (and signed types). If I explicitly declare the buffer as PByte, PWord, etc. I get exactly what I need, but, I would like to work with an abstract type (for example Pointer) and cast it depending on a flag returned by the library. If I pass a Pointer (instead of a PWord or PByte) and cast it to PWord, for example. I get the same result if I have passed a PByte. How can I handle a situation like this without explicitly define each type?. I'm not sure what you mean. How does your code look like now, and how do you want it to look? You can modify the function declarations in your units, to accept the properly typed pointer or an Var parameter. DoDi If you mean overloading functions, that is exactly what I don't want to do. My methods are similar to this: procedure TImageDrawer.Draw(ABuffer: PWord); begin ... end; As you can see, I'm passing a PWord, this works as expected, the same if I modify the funcion passing a PByte. But, as I cannot create a new function for each pointer type, I would like to pass a generic pointer, and typecast it inside the function, for example: procedure TImageDrawer.Draw(ABuffer: Pointer); begin ... if MyImage.DataType = Uint16 then data = PWord(ABuffer)^ else if MyImage.DataType = Uint8 then data = PByte(ABuffer)^; end; If I do this, the result of PWord(ABuffer) is the same as PByte(ABuffer). I'm starting to think PByte is equal to Pointer type. -- Leonardo M. Ramé http://leonardorame.blogspot.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] TAChart - Logarithmic Transform fails for X Axis
Hello Salvatore, Thanks for the reply. Yes, I used the same dataset and switched x and y. It worked when I did log transform with left-axis. the same dataset fails if I switch x and y and do transform on bottom axis. BR Peter Am 08.12.2013 18:44, schrieb Salvatore Coppola: Have you checked data (0)? Salvatore 2013/12/7 Peter Thurner pm.thur...@gmx.at mailto:pm.thur...@gmx.at Hello *, This is the first time that I post something, so please be patient with me :-) I have been using Plotpanel now for a while to plot Bode diagrams within Lazarus GUIs. Now I would like to switch to TAChart which seems very powerfull too. I tried it out with linear graphs and it works very well. But If I try to plot a bode diagram with a logarithmic x Axis then it crashes. I followed the tutorial about logarithmic transform: http://wiki.freepascal.org/TAChart_Tutorial:_ListChartSource,_Logarithmic_Axis,_Fitting and I did all the steps successfully. BUT If I try to apply a logarithmic transform to the bottom axis (x-axis) then it crashes. It displays the graph but the grid lines are gone. Has anybody tried already to apply log transform to bottom axis? It works for left axis. Thanks PeterT -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org mailto:Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
