How can i change the width of a shape?

Ozkar619

Hello.
I'm having a little issue with the shape object.
I'm triying to make a lifebar, so the fillbar (a shape sprite) changes it's width depending on the life of the player.
It's very simple, but there is no setWidth property for sprite or shape.
How can I do this with gideros?

Thanks in advance!

hnim

i think setScaleX or setScaleY is another solution.

Ozkar619

Yeah, I've tried that, but i think it's not working because I haven't gave an actual size to the shape/sprite itself. Maybe it is scaling it, but you can't scale a 0 value.
How do I give an initial size to the shape?
sorry for the inconvenience, and thanks in advance!

bowerandy

When you create a Shape you first have to draw into it to give it a size. After that you can scale it. Try this:

-- Create a unit square shape local bar=Shape.new() bar:setFillStyle(Shape.SOLID, 0xff0000) bar:beginPath() bar:moveTo(0,0) bar:lineTo(1,0) bar:lineTo(1,1) bar:lineTo(0,1) bar:lineTo(0,0) bar:endPath()   -- Add it to the stage stage:addChild(bar)   -- You can define some useful helper methods in Sprite to set width and height -- directly function Sprite:setWidth(newWidth) local scale=self:getScaleX() local width=self:getWidth() local newScale=scale/width*newWidth self:setScaleX(newScale) end   function Sprite:setHeight(newHeight) local scale=self:getScaleY() local width=self:getHeight() local newScale=scale/width*newHeight self:setScaleY(newScale) end   -- Now use these to control your bar bar:setHeight(10) bar:setWidth(lifeForce)

HTH

best regards

Teranth

@bowerandy nice example, yeah that is exactly the type solution i would use as well. Just create a slice shape, and then extend it as needed with setScaleX. I like your added functions for the sprite class. might just have to borrow those

petec

@bowerandy That example has helped me see how I can add functions to the sprite class, which I had never really got before. Really useful for a learner like me and should help me make my code more efficient. Thanks

atilim

Thank you @bowerandy

As a small addition to your method, I would prefer using untransformed bounds as:

function Sprite:setWidth(newWidth) local x,y,width,height=self:getBounds(self) local newScale=newWidth/width self:setScaleX(newScale) end   function Sprite:setHeight(newHeight) local x,y,width,height=self:getBounds(self) local newScale=newHeight/height self:setScaleY(newScale) end

Because getWidth()/getHeight() can return 0 if scaleX/scaleY is already 0.

bowerandy

@atilim, thanks for that; I've updated my library to include your fix.

Ozkar619

@bowerandy @atilim Thanks a lot! It really helped I also updated my lib.