Difference between revisions of "B2.Contact"
From GiderosMobile
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=== Examples === | === Examples === | ||
'''Checking collisions from bottom using b2.Contact''' | '''Checking collisions from bottom using b2.Contact''' | ||
| − | < | + | <syntaxhighlight lang="lua"> |
local isTouchingGround = false | local isTouchingGround = false | ||
world:addEventListener(Event.BEGIN_CONTACT, function(e) | world:addEventListener(Event.BEGIN_CONTACT, function(e) | ||
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end | end | ||
end) | end) | ||
| − | </ | + | </syntaxhighlight> |
{|- | {|- | ||
| style="width: 50%; vertical-align:top;"| | | style="width: 50%; vertical-align:top;"| | ||
=== Methods === | === Methods === | ||
| − | [[ | + | [[b2.Contact:getChildIndexA]] <br/><!--GIDEROSMTD:b2.Contact:getChildIndexA() --> |
| − | [[ | + | [[b2.Contact:getChildIndexB]] <br/><!--GIDEROSMTD:b2.Contact:getChildIndexB() --> |
| − | [[ | + | [[b2.Contact:getFixtureA]] <br/><!--GIDEROSMTD:b2.Contact:getFixtureA() --> |
| − | [[ | + | [[b2.Contact:getFixtureB]] <br/><!--GIDEROSMTD:b2.Contact:getFixtureB() --> |
| − | [[ | + | [[b2.Contact:getFriction]] <br/><!--GIDEROSMTD:b2.Contact:getFriction() --> |
| − | [[ | + | [[b2.Contact:getManifold]] <br/><!--GIDEROSMTD:b2.Contact:getManifold() --> |
| − | [[ | + | [[b2.Contact:getRestitution]] <br/><!--GIDEROSMTD:b2.Contact:getRestitution() --> |
| − | [[ | + | [[b2.Contact:getWorldManifold]] <br/><!--GIDEROSMTD:b2.Contact:getWorldManifold() --> |
| − | [[ | + | [[b2.Contact:isTouching]] <br/><!--GIDEROSMTD:b2.Contact:isTouching() --> |
| − | [[ | + | [[b2.Contact:resetFriction]] <br/><!--GIDEROSMTD:b2.Contact:resetFriction() --> |
| − | [[ | + | [[b2.Contact:resetRestitution]] <br/><!--GIDEROSMTD:b2.Contact:resetRestitution() --> |
| − | [[ | + | [[b2.Contact:setEnabled]] <br/><!--GIDEROSMTD:b2.Contact:setEnabled(flag) --> |
| − | [[ | + | [[b2.Contact:setFriction]] <br/><!--GIDEROSMTD:b2.Contact:setFriction(friction) --> |
| − | [[ | + | [[b2.Contact:setRestitution]] <br/><!--GIDEROSMTD:b2.Contact:setRestitution(restitution) --> |
| style="width: 50%; vertical-align:top;"| | | style="width: 50%; vertical-align:top;"| | ||
Latest revision as of 02:45, 1 December 2023
Supported platforms: 
Available since: Gideros 2012.09.6
Description
The class manages contact between two shapes. A contact exists for each overlapping AABB in the broad-phase (except if filtered). Therefore a contact object may exist that has no contact points.
Examples
Checking collisions from bottom using b2.Contact
local isTouchingGround = false
world:addEventListener(Event.BEGIN_CONTACT, function(e)
local manifold = e.contact:getWorldManifold()
if manifold.normal.y > 0.9 then
--collision came from bottom
isTouchingGround = true
end
end)
world:addEventListener(Event.END_CONTACT, function(e)
local manifold = e.contact:getWorldManifold()
if manifold.normal.y < 0.1 then
--collision ended from bottom
isTouchingGround = false
end
end)
