Fire Ragdoll at Position of Touch

Solar2D General Questions/Discussion
#1

Hey all, the title pretty much explains exactly what I’m trying to do. This is what I have so far:

function spawnRagdoll(event)  
 if event.phase == "ended" then  
 ragdollGroup = display.newGroup()  
  
 ragdollBody = display.newImage("Art/ragdollBody.png")  
 ragdollArm1 = display.newImage("Art/ragdollArm.png")  
 ragdollArm2 = display.newImage("Art/ragdollArm.png")  
  
 physics.addBody(ragdollBody, {friction = 0.3})  
 physics.addBody(ragdollArm1, {friction = 0.3})  
 physics.addBody(ragdollArm2, {friction = 0.3})  
  
 physics.newJoint("pivot", ragdollBody, ragdollArm1, 28, 12)  
 physics.newJoint("pivot", ragdollBody, ragdollArm2, 0, 12)  
  
 ragdollGroup:insert(ragdollBody)  
 ragdollGroup:insert(ragdollArm1)  
 ragdollGroup:insert(ragdollArm2)  
 ragdollGroup.y = 430  
  
 local x = event.x  
 local y = event.y  
 local xForce = x - ragdollBody.x  
 local yForce = y - ragdollBody.y  
  
 ragdollBody:applyLinearImpulse(xForce, yForce, ragdollBody.x, ragdollBody.y)  
 end  
 end  
  
 Runtime:addEventListener("touch", spawnRagdoll)

This works, sort of…It fires in the general direction of the touch position, but only if I touch right at the top edge of the screen. Also, I’m only using the simulator right now. Tomorrow, I’ll probably get around to testing this on a real device. Thanks for any help, guys! [import]uid: 13174 topic_id: 5366 reply_id: 305366[/import]

#2

you’re making the force power relative to the distance of your touch event from your ragdoll

[lua]local xForce = x - ragdollBody.x
local yForce = y - ragdollBody.y[/lua]

so obviously it’s going to fire further (by applying more force) the further away your touch event is.

if you want a consistent force you want to work out your angle then use trig to apply the correct value in each direction

something like this maybe (untested)

[lua]local pi = math.pi
local cos = math.cos
local sin = math.sin

local x = event.x
local y = event.y
local deltaX = x - ragdollBody.x
local deltaY = y - ragdollBody.y
local angle = math.deg( math.atan( deltaY / deltaX ) )

local force = 0.7 – change this to whatever value you need

local xForce = ( sin( angle * pi / 180 ) * force )
local yForce = ( cos( angle * pi / 180 ) * force )

ragdollBody:applyLinearImpulse(xForce, yForce, ragdollBody.x, ragdollBody.y)[/lua] [import]uid: 6645 topic_id: 5366 reply_id: 17897[/import]

#3

Well, actually, I am trying to apply more force the farther away the touch is. But maybe I’m implementing it wrong? Also, it works fine if I don’t set the ragdollGroup’s coords right before I launch it. But, obviously that leaves it at 0, 0, and that’s not what I’m looking for. Thanks for your help! [import]uid: 13174 topic_id: 5366 reply_id: 17933[/import]

#4

Hello? Can anyone help me, please? [import]uid: 13174 topic_id: 5366 reply_id: 18035[/import]

#5

Please, can someone at least attempt to help me? [import]uid: 13174 topic_id: 5366 reply_id: 18676[/import]