Rotation

BlitzMax Forums/BlitzMax Beginners Area/Rotation

Mordax_Praetorian

(Posted 2006) [#1]

I have totaly failed at understanding how Rotation in BMax works

From what I could tell, using SetRotation would rotate all images drawn after that point, however, SetRotation appears to do absolutly nothing, I figured maybe I had to reload the images I wanted to rotate, like with SetMask, but this didnt work either

smilertoo

(Posted 2006) [#2]

it does what it says, everything will be drawn rotated until another setrotation command is given.

GfK	(Posted 2006) [#3]

It works fine here - maybe you're feeding it a float between 0 and 1, where you should be using an angle measured in degrees?

Dreamora

(Posted 2006) [#4]

SetRotation changes the rotation of all following drawimage commands, thats correct. BUT: the angle you set is absolute, not relative to their previous angle, so if you want have a changing angle you need to have a variable that you raise.

SetRotation rotates the images around their handle which normally is the top left corner.

You don't need to reload or anything else.

Mordax_Praetorian

(Posted 2006) [#5]

but it isnt, I've tested!

TestImage = LoadImage("TS/Arrow.png")
Graphics 800,600
DrawImage TestImage, 1,1
Flip
Delay 1000
SetRotation (90)
Cls
DrawImage TestImage, 1,1
Flip
Delay 1000

After 1 second the screen goes black

aparently, SetRotation is causing DrawImage to do nothing

Mordax_Praetorian

(Posted 2006) [#6]

OMG I'm so stupid, the image was rotating off the screen

If I didnt beleive it would send me to hell, I would go and hang myself in stupidity right now

Dreamora

(Posted 2006) [#7]

That code can't work.

You have to FIRST call graphics and load media afterwards. Graphics cleans all graphic data.

Mordax_Praetorian

(Posted 2006) [#8]

Aparently Graphics doesnt clean all graphics data as the image still worked, but the problem is fixed at any rate

GfK	(Posted 2006) [#9]

That code can't work.

Yes, it does work.

You have to FIRST call graphics and load media afterwards. Graphics cleans all graphic data.

Not the case with DX or GL - try it and see.

Jesse

(Posted 2006) [#10]

I have done that in several ocations but I did noticed that on some graphics cards with certain resolution the image gets distorted. now to play it safe, first I call the graphics command. And maybe that got fixed with the newest version of BMAX.