draw a area of an image

BlitzMax Forums/BlitzMax Beginners Area/draw a area of an image

hub	(Posted 2006) [#1]

Hi !
Is there a command to draw a area of an image ? Drawimagerect draw the entire image with deformation, not a portion of the image
Thanks !

SillyPutty

(Posted 2006) [#2]

Check in the Code Archives, I am sure someone gave a solution to this.

** EDIT

Here you go.
http://www.blitzbasic.com/codearcs/codearcs.php?code=1422

hub	(Posted 2006) [#3]

Thanks, but i prefer use classic bmax 2dcommands for compatibility.
I fact i want do this :

-- but without the black rectangle !!! --

perhaps have you some ideas ! (in my game i use a background image, so i can't use this technic). i want only draw the image.


Graphics 800, 600

Global hImageGriffe = LoadImage ("Griffe.png")

l = ImageWidth (hImageGriffe)
Temps = MilliSecs()

inc = 0
Sens = 1
x = 400	

w = ImageWidth(hImageGriffe)

While Not KeyDown (KEY_ESCAPE)

	Cls

	If Temps + 500 < MilliSecs() Then
		

		DrawImageRect hImageGRiffe, x, 250, w, ImageHeight(hImageGriffe)

		If sens = 1 Then 
			If inc < l  Then 
				inc = inc + 1
			Else
				sens = - 1
			End If
		End If
		
		If Sens = - 1 Then
			If inc > 0 Then
				Inc = Inc - 1
			Else
				sens = 1
			End If
		End If
		
		x = 400 - inc
		
	End If	
	
	SetAlpha 0.8
	SetColor 0,0,0
	DrawRect 400,200,400,200
	SetAlpha 1.0
	SetColor 255,255,255
	
	Flip
Wend

image here :

Haramanai

(Posted 2006) [#4]

I thing this will do the trick
Edit:"setViewport"

Yan	(Posted 2006) [#5]

One from the archives...

Function DrawImageRectClip(image:TImage, x#, y#, rx#, ry#, rw#, rh#, frame=0)
	Local vx, vy, vw, vh, hx#, hy#
	
	hx# = image.handle_x
	hy# = image.handle_y
	SetImageHandle image, 0, 0
	GetViewport(vx, vy, vw, vh)
	SetViewport x#, y#, rx# + rw#, ry# + rh#
	
	DrawImage image, x# - rx#, y# - ry#, frame
	
	SetViewport vx, vy, vw, vh
	SetImageHandle image, hx#, hy#
End Function

hub	(Posted 2006) [#6]

Many thanks for your help. This seems works fine now !