I’m building this game below and I’m doing a check to make sure all the objects are below the dotted line. The only issue with that is the cords are pulled from the center of the object. So the y value isn’t where I want it to be. What would be the best way to confirm that the whole object is below the line?
Hi @dmglakewood,
You can use the “object.contentBounds” property for this, as follows:
[lua]
local box = display.newRect( 100,100,200,200 ) ; box:setFillColor(255)
local function boundCheck()
local bounds = box.contentBounds
print("xMin: "… bounds.xMin) – xMin: 100
print("yMin: "… bounds.yMin) – yMin: 100
print("xMax: "… bounds.xMax) – xMax: 150
print("yMax: "… bounds.yMax) – yMax: 150
end
transition.to( box, { time=20000, rotation=360 } )
timer.performWithDelay( 1000, boundCheck, 0 )
[/lua]
Notice how the values change as the box rotates. Basically, it’s just giving you the outer bounds of a theoretical rectangle drawn around the object.
If you’re using physics, the approach could be different… you could use a big sensor for the region the object isn’t supposed to be within (above the line) and ensure that all objects have exited that region.
Hope this helps!
Brent
Awesome thanks for the tips! I knew there had to be an easier way then what I was about to do 
Here is the image of the rock that is still above the line. I’m using the bounds method to make sure the y value is below the y value of the line.
local bounds = innerGroup[blocks].contentBounds if(bounds.yMin \< levelGoalBar.y) then levelOver = false break end
I have this code loop through all the items on the screen. If any objects are above the line the level goes on. If all items are below the line the level is over. The image above threw a level over response even though the yMin is still above the bar. Any ideas on this?
I’d have to see how you’re structuring this “innerGroups[blocks]”. There must just be some tiny issue with how you’re referencing the objects…
Brent
Hi @dmglakewood,
You can use the “object.contentBounds” property for this, as follows:
[lua]
local box = display.newRect( 100,100,200,200 ) ; box:setFillColor(255)
local function boundCheck()
local bounds = box.contentBounds
print("xMin: "… bounds.xMin) – xMin: 100
print("yMin: "… bounds.yMin) – yMin: 100
print("xMax: "… bounds.xMax) – xMax: 150
print("yMax: "… bounds.yMax) – yMax: 150
end
transition.to( box, { time=20000, rotation=360 } )
timer.performWithDelay( 1000, boundCheck, 0 )
[/lua]
Notice how the values change as the box rotates. Basically, it’s just giving you the outer bounds of a theoretical rectangle drawn around the object.
If you’re using physics, the approach could be different… you could use a big sensor for the region the object isn’t supposed to be within (above the line) and ensure that all objects have exited that region.
Hope this helps!
Brent
Awesome thanks for the tips! I knew there had to be an easier way then what I was about to do
Here is the image of the rock that is still above the line. I’m using the bounds method to make sure the y value is below the y value of the line.
local bounds = innerGroup[blocks].contentBounds if(bounds.yMin \< levelGoalBar.y) then levelOver = false break end
I have this code loop through all the items on the screen. If any objects are above the line the level goes on. If all items are below the line the level is over. The image above threw a level over response even though the yMin is still above the bar. Any ideas on this?
I’d have to see how you’re structuring this “innerGroups[blocks]”. There must just be some tiny issue with how you’re referencing the objects…
Brent