is there an error in the help file

BlitzMax Forums/MaxGUI Module/is there an error in the help file

Blue Steel

(Posted 2011) [#1]

I've just installed BM 1.41 and BMGUI141 on win7 proffessional 32bit, rebuilt the docs, and i'm going through the source code in the help file For maxgui overview,
when i copy / paste this section of code from it and try to run it , it comes up with this error message

Compile Error: Unable to convert from 'TGraphics' to 'Int'

here is the output from the output window of Blitxmax

Building untitled1
Compiling:untitled1.bmx
Compile Error: Unable to convert from 'TGraphics' to 'Int'
[C:/BlitzMax/tmp/untitled1.bmx;31;6]
Build Error: failed to compile C:/BlitzMax/tmp/untitled1.bmx
Process complete

here is the code i copy/pasted

' createcanvas.bmx

Strict 

Import MaxGUI.Drivers

Global GAME_WIDTH=320
Global GAME_HEIGHT=240

' create a centered window with client size GAME_WIDTH,GAME_HEIGHT

Local wx=(GadgetWidth(Desktop())-GAME_WIDTH)/2
Local wy=(GadgetHeight(Desktop())-GAME_HEIGHT)/2

Local window:TGadget=CreateWindow("My Canvas",wx,wy,GAME_WIDTH,GAME_HEIGHT,Null,WINDOW_TITLEBAR|WINDOW_CLIENTCOORDS)

' create a canvas for our game

Local canvas:TGadget=CreateCanvas(0,0,320,240,window)

' create an update timer

CreateTimer 60

While WaitEvent()
   Select EventID()
   	Case EVENT_TIMERTICK
   		RedrawGadget canvas

   	Case EVENT_GADGETPAINT
   		Local g=CanvasGraphics(canvas)
   		SetGraphics g
   		SetOrigin 160,120
   		SetLineWidth 5
   		Cls
   		Local t=MilliSecs()
   		DrawLine 0,0,120*Cos(t),120*Sin(t)
   		DrawLine 0,0,80*Cos(t/60),80*Sin(t/60)
   		Flip

   	Case EVENT_WINDOWCLOSE
   		FreeGadget canvas
   		End

   	Case EVENT_APPTERMINATE
   		End
   End Select
Wend

Can anyone help me here

Floyd

(Posted 2011) [#2]

When I run that code the IDE highlights the line: Local g=CanvasGraphics(canvas)

and complains about converting TGraphics to Int.

The help say CanvasGraphics returns a TGraphics object. The variable g has the default datatype of Int. So I blindly made the following change:

Local g:TGraphics=CanvasGraphics(canvas)

and all is well.

Alternatively you could not use Strict mode, but you're better off getting used to it.

Brucey

(Posted 2011) [#3]

Well, SuperStrict would have complained about the line in question to begin with :-)

Blue Steel

(Posted 2011) [#4]

thanks ;)

Can this be fixed in the manual ;)