How to add force to game object so it's move's in projectile path?

MADHU_G_T · June 25, 2021, 8:51am

Hi, I have a game object (Frog). when I touch or click the frog it needs to jump in the x-axis. Please help me with hints so I can solve this problem.
frog

britzl · June 25, 2021, 8:59am

Here’s an Angry Birds like example game I made a few years ago:

Code: GitHub - britzl/throwacrow: Defold example of a slingshot style physics game
Demo: Throw a Crow 0.1

Relevant line where a force is applied:

github.com

britzl/throwacrow/blob/master/main/throwacrow.script#L108

    
      
          			end
          		elseif action.released then
          			--
          			-- did we release while aiming?
          			-- if yes, fling the bird!
          			-- if no, stop panning
          			--
          			if self.aiming then
          				local direction = self.initial_position - go.get_position()
          				msg.post("#collisionobject", "enable")
          				msg.post("#collisionobject", "apply_force", { force = direction * 950 * go.get("#collisionobject", "mass"), position = go.get_world_position() })
          				msg.post(".", "release_input_focus")
          				self.flinging = true
          				self.aiming = false
          				self.idle_frames = 0
          				self.pressed_position = nil
          			else
          				self.panning = false
          			end
          		end
          	elseif action_id == hash("toggle_physics_debug") and action.released then

Direction is a vector pointing in the direction the force should be applied. Examples:

-- vector pointing straight up in the air
vmath.vector(0, 1, 0)

-- vector pointing horizontally to the right
vmath.vector(1, 0, 0)

-- vector pointing at 45 degree angle up and right
vmath.vector(1, 1, 0)

The force applied to the object is the direction multiplied by the magnitude. The force is applied to the center of the collision object.

msg.post("#collisionobject", "apply_force", { force = direction * 950 * go.get("#collisionobject", "mass"), position = go.get_world_position() })

MADHU_G_T · June 25, 2021, 9:45am

Thank you for your help :))