Rotate an object in clockwise direction by circling around the object?

fazilreyaz · May 19, 2018, 7:40am

Hello There!

I want to rotate an object only in clockwise direction not in anti clockwise direction and it should stop after few complete rotations.

Here is my code:

local circle = display.newImageRect( "stearing.png", 158, 158 ) circle.x = display.contentWidth / 2 circle.y = display.contentHeight / 2 local function rotateObj(event) &nbsp; &nbsp; &nbsp; &nbsp; local t = event.target &nbsp; &nbsp; &nbsp; &nbsp; local phase = event.phase &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (phase == "began") then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; display.getCurrentStage():setFocus( t ) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.isFocus = true &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.x1 = event.x &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y1 = event.y &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elseif t.isFocus then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (phase == "moved") then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.x2 = event.x &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y2 = event.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; angle1 = 180/math.pi \* math.atan2(t.y1 - t.y , t.x1 - t.x) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; angle2 = 180/math.pi \* math.atan2(t.y2 - t.y , t.x2 - t.x) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; rotationAmt = angle1 - angle2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.rotation = t.rotation - rotationAmt &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; t.x1 = t.x2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y1 = t.y2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elseif (phase == "ended") then &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; display.getCurrentStage():setFocus( nil ) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.isFocus = false &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return true end circle:addEventListener("touch", rotateObj)

Above code works for both the directions i.e. clockwise and anti clockwise.

So, I want to know what changes I have to make to achieve the desired task.

Any help would be highly appreciated.

Thanks,

ldurniat · May 19, 2018, 12:04pm

Try replace line

&nbsp;t.rotation = t.rotation - rotationAmt

with

if rotationAmt \< 0 then &nbsp; &nbsp; t.rotation = t.rotation - rotationAmt end

ldurniat

fazilreyaz · May 19, 2018, 12:10pm

Perfect. Thank you so much.

ldurniat · May 19, 2018, 12:04pm

Try replace line

&nbsp;t.rotation = t.rotation - rotationAmt

with

if rotationAmt \< 0 then &nbsp; &nbsp; t.rotation = t.rotation - rotationAmt end

ldurniat

fazilreyaz · May 19, 2018, 12:10pm

Perfect. Thank you so much.