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POHTML5 + JS: Collision Detection For Rotatable Character
primarykey
Id
14510164
data
AcceptedAnswerId
14588514
AnswerCount
2
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2013-01-24T20:30:26.483
FavoriteCount
3
LastActivityDate
2013-02-04T09:50:23.020
LastEditDate
2013-01-28T00:42:39.737
LastEditorUserId
1029969
OwnerUserId
1029969
ParentId
0
PostTypeId
1
Score
8
ViewCount
1073
LastEditorDisplayName
text
Body
I'm working on the Collision system for my game; which is a top down shooter, the character is always static - and everything else (Map/Level), moves around him. The character also rotates so it's always facing the mouse position. With that in mind, I can't seem to get my head around my collision system, which needs to take into account of the character rotation, right? I basically just want to check if the given object is at all 'touching' my character/sprite. I'm not so sure if the maths I'm using is correct. This is my collision detection (called every update): <pre><code>function detectCollisions(){ //Detect for game props if(collides(Map, TestProp)){ console.debug("Touching..."); } } function collides(a, b){ //ctxMap.setTransform(1, 0, 0, 1, -Map.x + gameWidth/2, -Map.y + gameHeight/2); //var transX = -Map.x + gameWidth/2; //var transY = -Map.y + gameHeight/2; //need to take player rotation into account too! //console.debug(a.x + " " + b.x + " " + b.width + " " + Player.width); //A Width /*return a.x < b.x + b.width && a.x + Player.width > b.x && a.y < b.y + b.height && a.y + Player.height > b.y;*/ var xOffset = Math.cos(Player.characterRotation); //+ Player.width; var yOffset = Math.sin(Player.characterRotation); //+ Player.height; return Map.x + xOffset > b.x && Map.x + xOffset < b.x + b.width && Map.y + yOffset > b.y && Map.y + yOffset < b.y + b.height; } </code></pre> Also, not sure if this is relevant, but this is the transform used to move my Map Canvas: <pre><code>ctxMap.setTransform(1, 0, 0, 1, -Map.x + gameWidth/2, -Map.y + gameHeight/2); </code></pre> Would much appreciate it if someone helped me out here :) Thanks!
Tags
<javascript><html5><rotation><transform><collision>
Title
HTML5 + JS: Collision Detection For Rotatable Character
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USOliver Jones
UserOwnerUserId
1. USOliver Jones
plurals
PostLinksPostIdRelatedPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POHTML5 + JS: Collision Detection For Rotatable Character
 UserUserId
 UShobberwickey
 VoteTypeVoteTypeId
 VTFavorite
2. VO
 singulars
 PostPostId
 POHTML5 + JS: Collision Detection For Rotatable Character
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 POHTML5 + JS: Collision Detection For Rotatable Character
 UserUserId
 USOliver Jones
 VoteTypeVoteTypeId
 VTBountyStart
CommentsPostId

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