BitmapX -- Bitmap class with pixel-perfect hit detection

n1cke

It's Bitmap-based class to detect mouse/touch hits with pixel-perfect accuracy for any shapes.
You use it exactly as Bitmap class, it just improves hit detection: hits will be detected only for pixels with alpha greater than 0.
Thanks to @chuz0 for idea: http://giderosmobile.com/forum/discussion/6556/another-use-of-rendertarget

BitmapX = Core.class(Bitmap)   function BitmapX:init(texture) local w, h = texture:getWidth(), texture:getHeight() if texture:getClass() ~= "RenderTarget" then self.renderTarget = RenderTarget.new(w, h) self.renderTarget:draw(self) self:setTexture(self.renderTarget) else self.renderTarget = texture end self.renderWidth, self.renderHeight = w, h end   function BitmapX:hitTestPoint(x, y) local w, h = self.renderWidth, self.renderHeight x, y = x + 1, y + 1 if x < 1 or y < 1 or x > w or y > h then return end local color, alpha = self.renderTarget:getPixel(x, y) if alpha > 0 then return true end end

Example:

local texture = Texture.new "image.png" local button = BitmapX.new(texture) button:addEventListener(Event.MOUSE_DOWN, function(e) local x, y = button:globalToLocal(e.x, e.y) if button:hitTestPoint(x, y) then print "HIT" end end) stage:addChild(button) button:setScale(2) button:setRotation(30)