Using GDI32.DLL within a canvas
BlitzPlus Forums/BlitzPlus Programming/Using GDI32.DLL within a canvas
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| Hi all I'm fairly new Because I want to work within windows and also because I want maximum graphics capability I am investigating the use of GDI32.DLL I can get it to work and so far have tested (within the confines of a canvas in a window) Polyline, Polygon, Pens, Brushes and Floodfill - and work progresses nicely. I have a major problem though - I can create a Device Context for my canvas and select pen and brush into it by:- window=CreateWindow( etc ) canvas=CreateCanvas( ... ,window) canvaswnd=QueryObject(canvas,2) canvasDC=GetWindowDC(canvaswnd) ; ** from user32.dll brush=CreateSolidBrush(ColorRef1) pen=CreatePen(0,1,ColorRef2) SelectObject(canvasDC,brush) SelecrtObject(canvasDC,pen) then e.g. RoundRect%(canvasDC,50,300,350,350,20,10) ++++ So far so good UNFORTUNATELY all the drawing is done directly to screen which is not what one wants at all - though it's good enough to help me explore each of the GDI32 routines What I need to be able to do is to Create a memory Device Context (easy enough using CreateCompatibleDC(canvasDC) but I have found no way to be able to select into this context a bitmap to receive the results of my drawing. Ideally I would like to select into the DC the bitmap component of my Canvas Buffer so that then the calls to the GDI32.DLL lib routines can mix in with my B+ drawing commands and all be followed by FlipCanvas(canvas) Someone must have been here before but I have searched the archives and can find no mention of this issue anywhere Ideas anyone? Terry (from Tooting, London) |
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