Platform engine using Box2D – Step 3

核心提示： and I changed b2ContactListener.as as follows:/**Copyright(c)2006-2007ErinCattohttp://www.gphysics.com**Thissoftwareisprovided'as-is',withou

and I changed b2ContactListener.as as follows:

/*
*　Copyright　(c)　2006-2007　Erin　Catto　http://www.gphysics.com
*
*　This　software　is　provided　'as-is',　without　any　express　or　implied
*　warranty.　　In　no　event　will　the　authors　be　held　liable　for　any　damages
*　arising　from　the　use　of　this　software.
*　Permission　is　granted　to　anyone　to　use　this　software　for　any　purpose,
*　including　commercial　applications,　and　to　alter　it　and　redistribute　it
*　freely,　subject　to　the　following　restrictions:
*　1.　The　origin　of　this　software　must　not　be　misrepresented;　you　must　not
*　claim　that　you　wrote　the　original　software.　If　you　use　this　software
*　in　a　product,　an　acknowledgment　in　the　product　documentation　would　be
*　appreciated　but　is　not　required.
*　2.　Altered　source　versions　must　be　plainly　marked　as　such,　and　must　not　be
*　misrepresented　as　being　the　original　software.
*　3.　This　notice　may　not　be　removed　or　altered　from　any　source　distribution.
*/
　
package　Box2D.Dynamics{
　
　
　import　Box2D.Collision.*;
　import　Box2D.Collision.Shapes.*;
　import　Box2D.Dynamics.Contacts.*;
　import　Box2D.Dynamics.*;
　import　Box2D.Common.Math.*;
　import　Box2D.Common.*;
　
　
　///　Implement　this　class　to　get　collision　results.　You　can　use　these　results　for
　///　things　like　sounds　and　game　logic.　You　can　also　get　contact　results　by
　///　traversing　the　contact　lists　after　the　time　step.　However,　you　might　miss
　///　some　contacts　because　continuous　physics　leads　to　sub-stepping.
　///　Additionally　you　may　receive　multiple　callbacks　for　the　same　contact　in　a
　///　single　time　step.
　///　You　should　strive　to　make　your　callbacks　efficient　because　there　may　be
　///　many　callbacks　per　time　step.
　///　@warning　The　contact　separation　is　the　last　computed　value.
　///　@warning　You　cannot　create/destroy　Box2D　entities　inside　these　callbacks.
　public　class　b2ContactListener　{
　　var　canjump:Boolean=false;
　　///　Called　when　a　contact　point　is　added.　This　includes　the　geometry
　　///　and　the　forces.
　
　　public　function　can_jump()　{
　　　return　(canjump);
　　}
　
　　public　virtual　function　Add(point:b2ContactPoint):void　{}
　
　
　　///　Called　when　a　contact　point　persists.　This　includes　the　geometry
　　///　and　the　forces.
　　public　virtual　function　Persist(point:b2ContactPoint):void　{
　　　if　(point.shape1.GetUserData()=="groundsensor"||point.shape2.GetUserData()=="groundsensor")　{
　　　　canjump=true;
　　　}
　　}
　
　
　　///　Called　when　a　contact　point　is　removed.　This　includes　the　last
　　///　computed　geometry　and　forces.
　　public　virtual　function　Remove(point:b2ContactPoint):void　{
　　　if　(point.shape1.GetUserData()=="groundsensor"||point.shape2.GetUserData()=="groundsensor")　{
　　　　canjump=false;
　　　}
　　}
　
　
　　///　Called　after　a　contact　point　is　solved.
　　public　virtual　function　Result(point:b2ContactResult):void　{
　　}
　
　}
　
　
}

Playing a bit with impulses and bullets size, I made my hero shooting something like crates… and he can jump over them to reach higher places… needs some tweaks but it’s an interesting gameplay in my opinion…

Left/right arrow keys to move, up to jump and mouse to aim and shoot.

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