how to change the point of the ratation in a image

Monkey Forums/Monkey Programming/how to change the point of the ratation in a image

Lugato

(Posted 2012) [#1]

Hi to all ..

Anyone can give a little help ?

I need rotate a background image, but the point of ratation is set in top-left of the image.. I don't found a command in documentation to do it ..

thanks

therevills

(Posted 2012) [#2]

I think you can only do this using translate...

(and its rotation ;))

Shinkiro1

(Posted 2012) [#3]

(just guessing) Use image.SetHandle (x,y)
http://blitz-wiki.appspot.com/Image.SetHandle

Aman	(Posted 2012) [#4]

http://blitz-wiki.appspot.com/Image?format=mobile

SetHandle does the job. You can use Image.MidHandle when you load the image to set it to the middle point.

therevills

(Posted 2012) [#5]

Ah yes... SetHandle would do it too -_-

But heres how to do it with translate:

Import mojo

Class MyApp Extends App

	Field image:Image
	Field x#, y#
	Field offSetX#, offSetY#
	Field rot#
	Field timer#

	Method OnCreate()
		image = LoadImage( "alien1.png",8,Image.MidHandle )
		x = 100
		y = 100
		offSetX = -10
		offSetY = -50
		SetUpdateRate 60
	End
	
	Method OnUpdate()
		rot+=1
		timer-=1
		If timer <= 0 Then
			offSetX = Rnd(-30, 30)
			offSetY = Rnd(-30, 30)
			timer = 25
		End If
 	End
	
	Method OnRender()
		Cls
		PushMatrix
		Translate x, y 
		Rotate rot
		DrawImage image, 0 + offSetX, 0 + offSetY
		PopMatrix
		DrawLine x - 5 , y, x + 5, y
		DrawLine x , y - 5, x, y + 5
		DrawText timer, 10, 10
	End

End

Function Main()
	New MyApp
End

Or you could just use SetHandle ;)

Lugato

(Posted 2012) [#6]

Thanks therevills, shinkiro and Aman ..

I used the traslate aproach first .. but really the SetHandle is more easy to use in the project that I'm making ..

I think that the Monkey documentation wiki need a list of all methods each module have, because I don't see the SetHandle in the list of Graphics functions..

:)

therevills

(Posted 2012) [#7]

because I don't see the SetHandle in the list of Graphics functions..

Thats because its part of Image, not Graphics ;)

Lugato

(Posted 2012) [#8]

Ops..

My fault, I think I need talk with wiki a little more hahahhaha