XNA Track rotated pixel positions

Posted by jonny adams on Stack Overflow See other posts from Stack Overflow or by jonny adams
Published on 2010-05-03T15:23:32Z Indexed on 2010/05/03 15:28 UTC
Read the original article Hit count: 225

Filed under:

XNA

|

rotation

|

tracking

|

2d

|

math

Hi,

Im making a game in xna where a tank has to move over a landscape. I need to be able find the bottom of the tank when it is rotated so I can make it move up and down as the player goes over the landscape.

for example if i have a sprite at with its top left corner at 400,300 and i rotate it around its center by 45 degrees around its center, how do i find the new locations of the bottom track.

Thanks

© Stack Overflow or respective owner

Related posts about XNA

Camera for 2.5D Game

as seen on Game Development - Search for 'Game Development'
I'm hoping someone can explain this to me like I'm 5, because I've been struggling with this for hours and simply cannot understand what I'm doing wrong. I've written a Camera class for my 2.5D game. The intention is to support world and screen spaces like this: The camera is the black thing on… >>> More
Using XNA ContentPipeline to export a file in a machine without full XNA GS

as seen on Game Development - Search for 'Game Development'
My game uses the Content Pipeline to load the spriteSheet at runtime. The artist for the game sends me the modified spritesheet and I do a build in my machine and send him an updated project. So I'm looking for a way to generate the xnb files in his machine (this is the output of the content pipeline)… >>> More
XNA - Strange Texture Rendering Issue Using XNA BasicEffect

as seen on Game Development - Search for 'Game Development'
I have been reading and working through Riemers 3D XNA tutorials to expand my knowledge of XNA from 2D into 3D. Unfortunately I am having rendering issues that I am unable to solve and I need a point in the right direction. I am not expecting the Models to look identical to Blender but there is… >>> More
XNA Notes 009

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
This past week the MVPs (myself included) were on Microsoft campus for the MVP summit. So I apologize in advance if you did something cool or heard of something cool happening with XNA and XBLIGs and it’s not in my notes. I did my best to stay on top of things, but honestly this community is fast… >>> More
XNA Notes 006

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
If you used to think the XNA community was small and inactive, hopefully these XNA Notes are opening your eyes. And I honestly feel like I’m still only catching the tail end of everything that’s going on. It’s a large and active community and you can be so mired down in one part of it you miss all… >>> More

Related posts about rotation

Pygame surface rotation, rect rotation or sprite rotation?

as seen on Game Development - Search for 'Game Development'
i seem to have a conceptual misunderstanding of the surface and rect object in pygame. I currently observe these objects this way: Surface Just the loaded image rect the 'hard' representation of the ingame object (sprite). Used for simplifying object moment and collision detection sprite rect… >>> More
Need to translate a Rotation Matrix to Rotation y, x, z OpenGL & Jitter for 3D Game

as seen on Game Development - Search for 'Game Development'
I am using the Jitter Physics engine which gives a rotation matrix: M11 M12 M13 M21 M22 M23 M21 M32 M33 And I need it so OpenGL can use it for rotation GL.Rotate(xr, 1, 0, 0) GL.Rotate(yr, 0, 1, 0) GL.Rotate(zr, 0, 0, 1) Initially I Tried xr = M11 yr = M22 zr = M33 [1 0 0] [0 1 0] [0 0 1] Which… >>> More
Finetuning movement based on gradual rotation towards a target

as seen on Game Development - Search for 'Game Development'
I have an object which moves towards a target destination by gradually adjusting its facing while moving forwards. If the target destination is in a "blind spot", then the object is incapable of reaching it. This problem is ilustrated in the picture below. When the arrow is ordered to move to point… >>> More
2d movement solution

as seen on Game Development - Search for 'Game Development'
Hi! I'm making a simple top-down tank game on the ipad where the user controls the movement of the tank with the left "joystick" and the rotation of the turret with the right one. I've spent several hours just trying to get it to work decently but now I turn to the pros :) I have two referencial… >>> More
2d tank movement and turret solution

as seen on Game Development - Search for 'Game Development'
Hi! I'm making a simple top-down tank game on the ipad where the user controls the movement of the tank with the left "joystick" and the rotation of the turret with the right one. I've spent several hours just trying to get it to work decently but now I turn to the pros :) I have two referencial… >>> More