Moving an object around the screen

Getting Started Newbie Questions
#1

How can I move my ball all around the screen ? I want it to bounce of the four sides of the screen at random places . How can i do that ?

#2

Does “move” mean with your finger, or via physics simulation, or… ? Does “random places” mean the trajectory of the ball should be random after every bounce, or …?  I’ll just pick the meanings I preferred and if that happened to be what you really meant to ask, then yay :slight_smile:

local physics = require "physics" function SetDefaultAnchor( pos ) display.setDefault("anchorX", pos.x) display.setDefault("anchorY", pos.y) end function CreateWalls(BorderWidth) -- make the math easier local OldAnchor = {x = display.getDefault(anchorX), y = display.getDefault(anchorY) } SetDefaultAnchor({x=0, y=0}) local Height = display.contentHeight -- + (2 \* BorderWidth) local Width = display.contentWidth -- + (2 \* BorderWidth) local leftWall = display.newRect(0, 0, BorderWidth, Height) local rightWall = display.newRect(Width - BorderWidth, 0, BorderWidth, Height) local ceiling = display.newRect(0, 0, Width, BorderWidth) local floor = display.newRect(0, Height-BorderWidth, Width, BorderWidth) physics.addBody (leftWall, "static", {bounce = 1.1, friction = 1}) physics.addBody (rightWall, "static", {bounce = 1.1, friction = 1}) physics.addBody (ceiling, "static", {bounce = 1.1, friction = 1}) physics.addBody (floor, "static", {bounce = 1.1, friction = 1}) -- restore previous defaults SetDefaultAnchor(OldAnchor) end physics.start() -- let's make stuff yellow display.setDefault("fillColor", 1, 1, 0) CreateWalls(1) -- create image of a ball local Ball = display.newCircle(100, 100, 40) -- define physics object attached to image of ball physics.addBody(Ball, "dynamic", {friction=0}) -- give ball a shove Ball:applyLinearImpulse(-.05, .05, 0, 0)

One ball (circle attached to physics body) bouncing around “sides of the screen” (four rectangles attached to “static” physics bodies so they don’t move).

#3

Do you just want to drag and throw the ball? 

–SonicX278 

#4

Does “move” mean with your finger, or via physics simulation, or… ? Does “random places” mean the trajectory of the ball should be random after every bounce, or …?  I’ll just pick the meanings I preferred and if that happened to be what you really meant to ask, then yay :slight_smile:

local physics = require "physics" function SetDefaultAnchor( pos ) display.setDefault("anchorX", pos.x) display.setDefault("anchorY", pos.y) end function CreateWalls(BorderWidth) -- make the math easier local OldAnchor = {x = display.getDefault(anchorX), y = display.getDefault(anchorY) } SetDefaultAnchor({x=0, y=0}) local Height = display.contentHeight -- + (2 \* BorderWidth) local Width = display.contentWidth -- + (2 \* BorderWidth) local leftWall = display.newRect(0, 0, BorderWidth, Height) local rightWall = display.newRect(Width - BorderWidth, 0, BorderWidth, Height) local ceiling = display.newRect(0, 0, Width, BorderWidth) local floor = display.newRect(0, Height-BorderWidth, Width, BorderWidth) physics.addBody (leftWall, "static", {bounce = 1.1, friction = 1}) physics.addBody (rightWall, "static", {bounce = 1.1, friction = 1}) physics.addBody (ceiling, "static", {bounce = 1.1, friction = 1}) physics.addBody (floor, "static", {bounce = 1.1, friction = 1}) -- restore previous defaults SetDefaultAnchor(OldAnchor) end physics.start() -- let's make stuff yellow display.setDefault("fillColor", 1, 1, 0) CreateWalls(1) -- create image of a ball local Ball = display.newCircle(100, 100, 40) -- define physics object attached to image of ball physics.addBody(Ball, "dynamic", {friction=0}) -- give ball a shove Ball:applyLinearImpulse(-.05, .05, 0, 0)

One ball (circle attached to physics body) bouncing around “sides of the screen” (four rectangles attached to “static” physics bodies so they don’t move).

#5

Do you just want to drag and throw the ball? 

–SonicX278