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| Label: corona android iphone ipad building error inmobi problem display screen View image tableView failed object physics touch button game lua config event listener | |
hi..
.. i'm throwing objects by dragging each one of them using a 'tempJoint'
.. i want to set a max. speed for the throwing speed;
so even if i drag and throw it so fast, the object wouldn't be thrown faster than the limit which was set before..
any thoughts !?
Kamel
You might use obj:getLinearVelocity() to check the speed and immediately bump it down if it is too high.
Peach :)
Hi Peach,
i get the linear velocity then i set with a new one, and it set correctly..
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | stones[c].tempJoint:setTarget( event.x + deltaX, event.y + deltaY ) vx, vy = stones[c]:getLinearVelocity() print("velocityX : "..vx) print("velocityY : "..vy) if vx > 100 then vx=100 elseif vx < -100 then vx=-100 end if vy>300 then vy=300 elseif vy<-300 then vy=-300 end stones[c]:setLinearVelocity( vx, vy ) v1, v2 = stones[c]:getLinearVelocity() print("new velocity X : "..v1) print("new velocity Y : "..v2) |
i couldn't bump the velocity down using applyForce() !!
Could you post more code? Based on what you have, line 2 through line 19 should be wrapped inside a Runtime:addEventListener("enterFrame", ? ) function. Otherwise from your code, its checking the velocity once and changing it. The acceleration rom the joint will easily override this a millisecond later.
of course ... and here's the whole function
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | local cancel=10 -- a tracing flag local timerNew -- timer to cancel the joint prevPause=0 -- a flag variable for pausing game local notFall = 0 -- a tracing variable for the stone if it hasn't been thrown yet local function onClick (event) local phase = event.phase function cancelEvent() stones[c].tempJoint:removeSelf() touched=false cancel=cancel+1 print("cancel "..cancel) notFall=1 end if "began" == phase then if(event.y>50) then stones[c].bodyType = "dynamic" stones[c].isBullet = true touched = true cancel=10 print("began") notFall=0 deltaX = stones[c].x - event.x; -- in order to drag the object from deltaY = stones[c].y - event.y; -- anywhere on the screen stones[c].tempJoint = physics.newJoint( "touch", stones[c], stones[c].x, stones[c].y ) Runtime:removeEventListener("enterFrame", moveStone) -- as the stone is moving at some kind of path timerf=timer.performWithDelay(50,cancelEvent,1) -- to not holding the stone too much timerNew=timer.performWithDelay(100,newRound,1) -- generate a new stone prevPause=0 end elseif touched then if(event.y > 10) then stones[c].tempJoint:setTarget( event.x + deltaX, event.y + deltaY ) --///// calc. the velocity vx, vy = stones[c]:getLinearVelocity() print("velocityX : "..vx) print("velocityY : "..vy) if vx > 100 then vx=100 elseif vx < -100 then vx=-100 end if vy>300 then vy=300 elseif vy<-300 then vy=-300 end stones[c]:setLinearVelocity( vx, vy ) v1, v2 = stones[c]:getLinearVelocity() print("new velocity X : "..v1) print("new velocity Y : "..v2) -- //////////////// print("dragged") if notFall==0 and cancel==10 then timer.cancel(timerf) timer.cancel(timerNew) timerf=timer.performWithDelay(50,cancelEvent,1) timerNew=timer.performWithDelay(100,newRound,1) notFall=1 end end if "ended" == phase then if cancel==10 then notFall=1 timer.cancel(timerf) timer.cancel(timerNew) timerNew=timer.performWithDelay(10,newRound,1) cancelEvent() end end end end sky:addEventListener("touch", onClick) |
I would still say to take out 40 and to 54 and make them into a runtime listener. You function is only slow done the stone when you move your finger a certain way - only when event.y > 10 and your finger is not stationary.
views:1624 update：2012/1/9 8:53:30