LHShape class is used to load and display a shape from a level file.
LHShape cannot yet display textures but only colored shapes, As soon as Apple adds this functionality into SpriteKit, LevelHelper will support it also.
- (NSMutableArray *)outlinePoints
Returns the outline points of the shape. Array with
NSValue with CGPoint.
Returns the size of the shape node by computing the bounding box of the points.
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