object on screen using interact2d

[dutch_delight]

Hey all,

can anyone help me or explain to me the interact2d function? I'm trying to put an object on screen but I cant get it in the right place.

this is sort of what i want to do: A 2 polygon plane that fits nicely into a radar frame. (radar frame is blitted on screen)
for example using a screen size of 800x480, the radar frame is always an 8th of the size of the frame buffer width (100 x 100) so the middle point where the radar object should be positioned is half of that (50 x50)
It's not a pivot problem but the radar object is a child of the player object and the camera is offset from the player

Code Select Expand

ui_frame_pos_x = (fb.height/16);// gives us the middle of the radar frame
ui_frame_pos_y = (fb.heigth/16);

SimpleVector dir=Interact2D.reproject2D3D(camera, fb, ui_frame_pos_x,ui_frame_pos_y).normalize();
RadarObject.clearTranslation();
RadarObject.translate(dir);
but that doesnt work, the radar object appears to be positioned at (150x0)


this does work (sort of) it's roughly in the right place but I cant accept that this is right:

Code Select Expand

SimpleVector dir=Interact2D.reproject2D3D(cam, fb, (-ui_frame_size_x+(ui_frame_size_x/2))+8, (ui_frame_size_y+ui_frame_size_x/2));

also, when my screen is 1024 wide, the above formula doesnt work and I need to do this, which is absolutely crazy:

Code Select Expand

SimpleVector dir=Interact2D.reproject2D3D(cam, fb, (-ui_frame_size_x)-(ui_frame_size_x/2)-(ui_frame_size_x/16), ui_frame_size_y+(ui_frame_size_y/2)-(ui_frame_size_y/16)).normalize();



So I dont think i'm doing it right. I have considered doing a lookup table for screen sizes but that's my last resort.
Any help much appreciated

[EgonOlsen]

Wouldn't it be better to put the radar object in a separate world, decouple it from the player, position it once and leave it alone? Or isn't that an option for some reason?

[dutch_delight]

Never even considered doing it like that. works perfectly. thanks