Placing images on GUI window and menu options
BlitzMax Forums/BlitzMax Beginners Area/Placing images on GUI window and menu options
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| Hello! I have been trying to place images on the menus options, for example: "X Load File" where "X" should show an image 16x16. I have also been trying to display images on the window by using: which gives me the error: "Unhandled Exception:Attempt to acess field or method of Null object". I have been searching in the forums without success. Can someone help? Thanks! Kind regards, >Marco A.G.Pinto -------------------- |
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| You should use SetGadgetPixmap for the menu icons; make sure you use the correct flags. For drawing images on windows you have to use a Canvas gadget. Also take a look at this series by Assari: http://www.2dgamecreators.com/maxgui/ |
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| @Kryzon Sorry for bothering you. I have been able to make a rectangle to appear in a Canvas. But the command I used to place an image doesn't do anything. I now have the following code:
Global canvas:TGadget=CreateCanvas(0,0,640,480,window)
SetGraphics CanvasGraphics(canvas)
DrawRect 20,20,50,80
Global image_shield=LoadImage:TImage("images/shield.png",flags=-1 )
DrawImage (image_shield,10,10,frame=0)
Flip
RedrawGadget canvas
and in the main loop I have: WaitEvent() t = EventID() If t=EVENT_GADGETPAINT Flip EndIf It draws the rectangle but no image. What am I doing wrong? Thanks! Kind regards, >Marco A.G.Pinto -------------------- |
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You just need to add all your drawing code (DrawImage... etc) to your main loop because basically the canvas will be blank each time a gadget-paint event is fired.WaitEvent() t = EventID() If t=EVENT_GADGETPAINT ' do ALL your scene drawing here.. DrawImage (image_shield,10,10,frame=0) Flip EndIf |
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And to fire a gadget-paint regularly you can use a timer:Local renderTimer:TTimer = CreateTimer(30) [...] Select t Case EVENT_TIMERTICK ;Redraw canvas with a 30 FPS frequency. If EventData() = renderTimer Then RedrawGadget canvas Case EVENT_GADGETPAINT UpdateGame() DrawImage [...] DrawImage [...] Flip Case EVENT_WINDOWCLOSE End End Select You could also use the EVENT_MOUSEMOVE event as reference to redraw the canvas, instead of a fixed timer. In any case, using a timer for controlling the canvas rendering is explained in further detail here: http://www.2dgamecreators.com/maxgui/T12-Canvas.html |
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| And to fire a gadget-paint regularly you can use a timer: I've just stopped doing that in my app as it obliterates the toolbar tooltips (i'm using windows xp). I just rely on gadget-paint messages for any os related things (like window resizing) and posting my own gadget-paint messages when i want to force a readraw. |
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| Thanks, my dear ones! I have been able to make it work! Kind regards from, >Marco A.G.Pinto -------------------- |
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| Buaaaaaaaaaaa I tried to do the same with a panel and it didn't work :( I tried to place an image on the window area and it worked, but while trying to place another image in a panel it appears inside the panel and outside it. Here is the code I am using:
Global canvas:TGadget=CreateCanvas(0,0,640,480,window)
ActivateGadget canvas
SetGraphics CanvasGraphics(canvas)
SetColor 240,240,240
DrawRect 0,0,640,480
Global image_shield=LoadImage:TImage("images/shield.png",flags=-1 )
DrawImage image_shield,529-20-20-8+4,98-10-15+16+16-8-4-2
Flip
RedrawGadget canvas
Global canvas2:TGadget=CreateCanvas(0,0,630+2,15+20+2+3-1,panel_copyright)
ActivateGadget canvas2
SetGraphics CanvasGraphics(canvas2)
SetColor 240,240,240
DrawRect 0,0,630+2,15+20+2+3-1
Global image_ribbon=LoadImage:TImage("images/ribbon.png",flags=-1 )
DrawImage image_ribbon,600-50-10,8
Flip
RedrawGadget canvas2
And in the main loop: If t=EVENT_GADGETPAINT ' shield image ActivateGadget canvas SetGraphics CanvasGraphics(canvas) DrawImage image_shield,529-20-20-8+4,98-10-15+16+16-8-4-2 Flip ' ribbon image ActivateGadget canvas2 SetGraphics CanvasGraphics(canvas2) DrawImage image_ribbon,600-50-10,8 Flip EndIf What am I doing wrong? Thanks! Kind regards, >Marco A.G.Pinto -------------------- |
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Perhaps you need:?Not Win32 GLShareContexts() ? Which is using a compiler directive (?Not Win32 /?) to call GLShareContexts(). Required for sharing images across canvases. As for Windows implementations there may be a bug in the directx drivers (I can't remember) but you can use OpenGL anyway. But, I don't think you need canvases to do what you are doing (if you're just displaying a static bitmap. In your panel try SetGadgetPixmap( panel_copyright, LoadPixmap( "images/ribbon.png" ) ) |
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