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Canvas Text Drawing

BlitzMax Forums/MaxGUI Module/Canvas Text Drawing

Twinprogrammer(Posted 2013) [#1]
Hello,

I'm using a canvas to draw text on screen, but I ran into a problem. It only draws texts that are large ( like "This text is super long compared to the other one") and only draws half to none of smaller sized texts (like "Hello World"). Is something wrong with the drawtext, setgraphics, cls, flip, or something else?


matibee(Posted 2013) [#2]
Post some code.


Twinprogrammer(Posted 2013) [#3]
This result shows all of the text on screen

	Method Draw()
			SetGraphics CanvasGraphics(screen)
			Cls
			DrawText "This is really really long text that is probably all going to be shown on screen", 0, 0
			Flip

	End Method




But this code shows only "       r d" when the text is "Hello World"

	Method Draw()
			SetGraphics CanvasGraphics(screen)
			Cls
			DrawText "Hello World", 0, 0
			Flip

	End Method



jsp(Posted 2013) [#4]
Try to add this line underneath SetGraphics
SetViewport 0,0,GadgetWidth( screen ),GadgetHeight( screen )


Twinprogrammer(Posted 2013) [#5]
That still didn't fix it


Twinprogrammer(Posted 2013) [#6]
Also, when I try to add different strings, I get a really weird response.


This result shows a really strange string

it shows

MyEEging EdiMyiEnginyiv,i1.0.0ityst


So is it a text reading glitch in blitz max?


col(Posted 2013) [#7]
I suggest posting a bare bones working example that shows the problem happening. This could be another problem in your code somewhere - overwriting pixmap memory or something bizarre.


Twinprogrammer(Posted 2013) [#8]
Here's the code for my window type.
MAKE SURE TO IMPORT MAXGUI.DRIVERS

Type TwistedGame2D Abstract
	
	Field Window:TGadget '// Our main window
	Field Flags:Int '// The flag for our main window
	Field screen:tgadget
	Field Title:String '// The title at the top of the window
	Field Width:Int '// The width of our window
	Field Height:Int '// The height of out window
	Field Hertz:Int = 60 '// The hertz of our window
	Field Fullscreen:Byte = False '// Whether or not our window is in full screen
	Field DrawMouse:Byte = True '// Whether or not we draw our mouse
	
	Field OverScan:Float = .1 '// (CONSOLE EXPORTING) The "overscan" of the TV's "safe area". Normally can't claculate it, so I put it at 10%
	
	Field bgcolorR:Int
	Field bgcolorG:Int
	Field bgcolorB:Int
	
	Field Timer:Tgadget
	
	Method Initialize()
	End Method
	Method Update()
	End Method
	Method LoadContent()
	End Method
	Method UnloadContent()
	End Method
	Method Draw()
	End Method

End Type


And Here's the code for displaying the window:


global VERSION:string = "1.0.0" '// My engine already contains this, this is for forum purposes only

Type TGame2D Extends TwistedGame2D

	Method initialize()
		flags:| WINDOW_CENTER
		flags:| WINDOW_TITLEBAR 
		Width = 800
		Height = 600
		overscan = 0.0
		Title = "Twisted Engine v. " + VERSION
		window = CreateWindow(Title, 0,0,Width,Height,window, flags)
		screen = CreateCanvas(0, 0 , width, height, window)
		CreateTimer hertz
	End Method
	
	Method Update() 
		While WaitEvent()
			Select EventID()
			
				Case EVENT_WINDOWCLOSE
					UnloadContent()
					End
				
				Case EVENT_TIMERTICK
					RedrawGadget(screen)
					
					
				Case EVENT_GADGETPAINT
					DRAW()	
				
			End Select
		Wend
	End Method
	
	Method Draw()
			SetGraphics CanvasGraphics(screen)
			SetVirtualResolution Width, Height
			SetViewport 0,0,GadgetWidth( screen ),GadgetHeight( screen ) 
			Cls
			DrawText "Hello World"+ " My Engine v. " + VERSION +" test", 0, 0
			Flip

	End Method
	
End Type

Global Game2D:TGame2D = New TGame2D
Game2D.initialize()
Game2D.Update()


Hope this helps you!


Midimaster(Posted 2013) [#9]
runs perfect on my machine.

some ideas for testing:

1.
this is not correct:
		window = CreateWindow(Title, 0,0,Width,Height,window, flags)


window has no parent:
		window = CreateWindow(Title, 0,0,Width,Height,NULL, flags)


2.
Try 
FLIP 0


3.
tell us the BlitzMax-Version, graphic card, etc...

4.
Try 15Hz

5.
try
screen = CreateCanvas(50, 50 , 700, 500, window)


6.
try to switch off:

a.) SetVirtualResolution Width, Height

b.) SetViewport 0,0,GadgetWidth( screen ),GadgetHeight( screen )

c.) Case EVENT_TIMERTICK RedrawGadget(screen)


col(Posted 2013) [#10]
Works ok here too. Win8 with an NVidia, and a Win7 with Radeon. All is ok.

Good suggestions to try from midimaster.

7. SetGraphicsDriver to something else if on a windows machine.


Twinprogrammer(Posted 2013) [#11]
The flip 0 got it. Thanks for all of your help guys!