The real Drawing Pad

[arb]

To make drawing environment like paint; we can use timer or on mouse events like attached project, but it's not the real thing cause when we draw fast it gives some distant dots, How can we fix this? any ideas?

[Centauri Soldier]

Use reteset's WinApi plugin.

[arb]

Thanks for reminding, but is there any other way except merging windows?

[holtgrewe]

arb,
Here's something I did a while ago - same problem with the 'dots' not keeping up with the mouse... maybe IR can explain why...?

http://www.indigorose.com/forums/thr...d-for-Children

[reteset]

calling , MoveTo() and LineTo() Windows GDI functions with a proper GDI pen would do that very good

in your sample you are creating objects continuously
when you look from another side it is equivalent of creating shape objec plugin in each time you create a dot
when i run the arb's sample project and after 10 seconds of mouse activity
application's memory utilization goes from 7 mb to 15 mb ,you simply flood the memory

[arb]

arb,
Here's something I did a while ago - same problem with the 'dots' not keeping up with the mouse... maybe IR can explain why...?

http://www.indigorose.com/forums/thr...d-for-Children

Yeah i saw that, very nice design !

calling , MoveTo() and LineTo() Windows GDI functions with a proper GDI pen would do that very good

Sounds promising, but i have no idea how to do that

[reteset]

here is a simple drawing example
this is not a complete sample , it only shows how to draw lines with GDI API
please keep in mind :
all the drawings will be lost after next window redraw
you will need to catch WM_PAINT message of app window to replicate previous drawings

there are two ways to do it
one; save current dc as a memory bitmap (using GDI API)
another way ; store mouse positions in a lua table and call moveto /lineto functions through that table in next time

also saving positions to a table ,may help you to save drawings to a file and load in next time
this is how graphic programs work (save as project)

[arb]

Wow, that was sweeeeeeeeet, Thank you very much for this.

I wish i learn more about windows capabilities.

Thanks again reteset

[O'Callaghan]

here is a simple drawing example
this is not a complete sample , it only shows how to draw lines with GDI API
please keep in mind :
all the drawings will be lost after next window redraw

@reteset,

I tryed to change the pen properties when calling the PenCreate function, theoretically the variable pStyle should be an string like PS_SOLID, PS_DASH...PS_INSIDEFRAME, however the placeholder for this variable is a number %d instead of %s, I could not find if the aforementioned strings have a number value.

CreatePen = function(pStyle,pSize,pColor)
  local va_arg = string.format("%d,%d,%d",pStyle,pSize,pColor);
  return DLL.CallFunction("Gdi32.dll", "CreatePen", va_arg, DLL_RETURN_TYPE_INTEGER, DLL_CALL_STDCALL);
end

When I change the pSize to a number greater than Zero, (more than one pixel) I have a delay when mouving the mouse, no drawn at all is seen untill few elapsed seconds or when moving the window along the screen.

Is this behaviour normal, my OS W7 Media center, AMS version 8.0.4.0.?

Thanks.