orbiting object around point using touch (non physics)

Dom_Studios · May 17, 2013, 5:45pm

i have a formula which allows an object to rotate around a centre point

this works fine, however i now want this to be based on a user dragging the object and it will perform the same orbit but the user will drag the object to make it orbit and it will be locked to this orbit

here is my code

local circleD = 320 local circle = display.newCircle(display.contentWidth/2,display.contentHeight/2,circleD) circle:setReferencePoint(display.CenterReferencePoint) local circleC = math.pi \* circleD &nbsp; &nbsp; &nbsp; local square = display.newRect(0,0,200,200) square.x, square.y = 320,320 square:setFillColor(100,255,55) &nbsp; &nbsp; &nbsp; local degrees = 1 function rotate (event) &nbsp; local rads = degrees \* (math.pi / 180.0) &nbsp; &nbsp; square.x = display.contentHeight/2 \* math.cos(rads) + (display.contentWidth/-1) &nbsp; &nbsp; square.y = display.contentHeight/2 \* math.sin(rads) + (display.contentHeight/2) &nbsp;&nbsp;&nbsp;&nbsp;degrees = degrees + 5 &nbsp; &nbsp; print (square.x, square.y) &nbsp;&nbsp;&nbsp;&nbsp; end &nbsp; &nbsp; Runtime:addEventListener("enterFrame", rotate)

Dom_Studios · May 19, 2013, 9:39am

I have managed to add a touch event that will do the dragging, but when I add a 2nd square, it will rotate around its own circle and not follow the first square in a snake a like effect.

I need it to follow the first, to give its a ferris wheel effect.

local circleD = 320 local circle = display.newCircle(display.contentWidth/2,display.contentHeight/2,circleD) circle:setReferencePoint(display.CenterReferencePoint) local circleC = math.pi \* circleD local squares = display.newGroup() local square = display.newRect(0,0,200,200) square.x, square.y = 320, 600 square:setFillColor(100,255,55) squares:insert(square) local square2 = display.newRect(0,0,200,200) square2.x, square2.y = 320, 320 square2:setFillColor(999,255,55) squares:insert(square2) local function onTouch( event ) &nbsp;&nbsp; &nbsp;local t = event.target &nbsp;&nbsp; &nbsp;local phase = event.phase &nbsp;&nbsp; &nbsp;if "began" == phase then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local parent = t.parent &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;parent:insert( t ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;display.getCurrentStage():setFocus( t ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.isFocus = true &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.x0 = event.x - t.x &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.y0 = event.y - t.y &nbsp;&nbsp; &nbsp;elseif t.isFocus then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if "moved" == phase then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.x = event.x - t.x0 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.y = event.y - t.y0 &nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local degrees = event.y &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local rads = degrees \* (math.pi / 180.0) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; t.x = display.contentWidth/2 \* math.cos(rads) - 100 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; t.y = display.contentHeight/2 \* math.sin(rads) - 100 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;degrees = degrees + 5 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; print (square.x, square.y) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;elseif "ended" == phase or "cancelled" == phase then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;display.getCurrentStage():setFocus( nil ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.isFocus = false &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;return true end squares:addEventListener( "touch", onTouch ) &nbsp;

Dom_Studios · May 19, 2013, 9:39am

I have managed to add a touch event that will do the dragging, but when I add a 2nd square, it will rotate around its own circle and not follow the first square in a snake a like effect.

I need it to follow the first, to give its a ferris wheel effect.

local circleD = 320 local circle = display.newCircle(display.contentWidth/2,display.contentHeight/2,circleD) circle:setReferencePoint(display.CenterReferencePoint) local circleC = math.pi \* circleD local squares = display.newGroup() local square = display.newRect(0,0,200,200) square.x, square.y = 320, 600 square:setFillColor(100,255,55) squares:insert(square) local square2 = display.newRect(0,0,200,200) square2.x, square2.y = 320, 320 square2:setFillColor(999,255,55) squares:insert(square2) local function onTouch( event ) &nbsp;&nbsp; &nbsp;local t = event.target &nbsp;&nbsp; &nbsp;local phase = event.phase &nbsp;&nbsp; &nbsp;if "began" == phase then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local parent = t.parent &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;parent:insert( t ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;display.getCurrentStage():setFocus( t ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.isFocus = true &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.x0 = event.x - t.x &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.y0 = event.y - t.y &nbsp;&nbsp; &nbsp;elseif t.isFocus then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if "moved" == phase then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.x = event.x - t.x0 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.y = event.y - t.y0 &nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local degrees = event.y &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local rads = degrees \* (math.pi / 180.0) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; t.x = display.contentWidth/2 \* math.cos(rads) - 100 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; t.y = display.contentHeight/2 \* math.sin(rads) - 100 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;degrees = degrees + 5 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; print (square.x, square.y) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;elseif "ended" == phase or "cancelled" == phase then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;display.getCurrentStage():setFocus( nil ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;t.isFocus = false &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;return true end squares:addEventListener( "touch", onTouch ) &nbsp;