im trying to create logic so that if an object is being dragged up, properties of the object change
wereas if the object is dragged down, then different properties are applied to the object
i cant figure out the math and/or logic that would tell me if object is increasing or decreasing in value
its probably very simple, but i cant figure it out.
hope someone can help
thanks
you would have to check if the values have increased or decreased comared to the starting point and do whatever according to that. I made a quick and easy sample to show it. It roates the square when moved in the x-axis, and scales it when moved in the y-axis:
[lua]
display.setStatusBar( display.HiddenStatusBar )
local function onTouch( event )
local t = event.target
local phase = event.phase
if “began” == phase then
t.isFocus = true
– Store initial position
t.x0 = event.x - t.x
t.y0 = event.y - t.y
elseif t.isFocus then
if “moved” == phase then
t.x = event.x - t.x0
t.y = event.y - t.y0
t.rotation = event.x - t.x0
local scale = 1 + ((t.y - display.contentCenterY)/1000)
t.yScale = scale
t.xScale = scale
elseif “ended” == phase or “cancelled” == phase then
display.getCurrentStage():setFocus( nil )
t.isFocus = false
end
end
return true
end
local square = display.newRect(0, 0, 80, 80)
square.x = display.contentCenterX
square.y = display.contentCenterY
square:setFillColor( 125, 125, 125 )
square.strokeWidth = 2
square:addEventListener( “touch”, onTouch )
[/lua]
thanks for the reply, i understand how to do this and have performed different actions between x and y,
what im after more specifically is throwing logic in that shows if y is increasing in value then do something, if its decreasing, do something else
thanks
I would probably set a value to check it against then, to see which way the target has moved. Did a quick example in the earlier code:
[lua]
display.setStatusBar( display.HiddenStatusBar )
local function onTouch( event )
local t = event.target
local phase = event.phase
local yNow = event.target.y – set the start value
if “began” == phase then
t.isFocus = true
– Store initial position
t.x0 = event.x - t.x
t.y0 = event.y - t.y
elseif t.isFocus then
if “moved” == phase then
t.x = event.x - t.x0
t.y = event.y - t.y0
local yMoved = t.y – new value of target
if yNow > yMoved then
print (“y is getting smaller”)
else
print (“y is getting larger”)
end
t.rotation = event.x - t.x0
local scale = 1 + ((t.y - display.contentCenterY)/1000)
t.yScale = scale
t.xScale = scale
elseif “ended” == phase or “cancelled” == phase then
display.getCurrentStage():setFocus( nil )
t.isFocus = false
end
end
return true
end
local square = display.newRect(0, 0, 80, 80)
square.x = display.contentCenterX
square.y = display.contentCenterY
square:setFillColor( 125, 125, 125 )
square.strokeWidth = 2
square:addEventListener( “touch”, onTouch )
[/lua]
thats perfect thanks!
for the life of me I couldnt figure it out
you would have to check if the values have increased or decreased comared to the starting point and do whatever according to that. I made a quick and easy sample to show it. It roates the square when moved in the x-axis, and scales it when moved in the y-axis:
[lua]
display.setStatusBar( display.HiddenStatusBar )
local function onTouch( event )
local t = event.target
local phase = event.phase
if “began” == phase then
t.isFocus = true
– Store initial position
t.x0 = event.x - t.x
t.y0 = event.y - t.y
elseif t.isFocus then
if “moved” == phase then
t.x = event.x - t.x0
t.y = event.y - t.y0
t.rotation = event.x - t.x0
local scale = 1 + ((t.y - display.contentCenterY)/1000)
t.yScale = scale
t.xScale = scale
elseif “ended” == phase or “cancelled” == phase then
display.getCurrentStage():setFocus( nil )
t.isFocus = false
end
end
return true
end
local square = display.newRect(0, 0, 80, 80)
square.x = display.contentCenterX
square.y = display.contentCenterY
square:setFillColor( 125, 125, 125 )
square.strokeWidth = 2
square:addEventListener( “touch”, onTouch )
[/lua]
thanks for the reply, i understand how to do this and have performed different actions between x and y,
what im after more specifically is throwing logic in that shows if y is increasing in value then do something, if its decreasing, do something else
thanks
I would probably set a value to check it against then, to see which way the target has moved. Did a quick example in the earlier code:
[lua]
display.setStatusBar( display.HiddenStatusBar )
local function onTouch( event )
local t = event.target
local phase = event.phase
local yNow = event.target.y – set the start value
if “began” == phase then
t.isFocus = true
– Store initial position
t.x0 = event.x - t.x
t.y0 = event.y - t.y
elseif t.isFocus then
if “moved” == phase then
t.x = event.x - t.x0
t.y = event.y - t.y0
local yMoved = t.y – new value of target
if yNow > yMoved then
print (“y is getting smaller”)
else
print (“y is getting larger”)
end
t.rotation = event.x - t.x0
local scale = 1 + ((t.y - display.contentCenterY)/1000)
t.yScale = scale
t.xScale = scale
elseif “ended” == phase or “cancelled” == phase then
display.getCurrentStage():setFocus( nil )
t.isFocus = false
end
end
return true
end
local square = display.newRect(0, 0, 80, 80)
square.x = display.contentCenterX
square.y = display.contentCenterY
square:setFillColor( 125, 125, 125 )
square.strokeWidth = 2
square:addEventListener( “touch”, onTouch )
[/lua]
thats perfect thanks!
for the life of me I couldnt figure it out