Loyc.Geometry.IRectangleReader< T > Interface Template Reference

Represents a read-only 2D rectangle. More...

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Source file:

• /Core/Loyc.Essentials/Geometry/IRectangle.cs

Inheritance diagram for Loyc.Geometry.IRectangleReader< T >:

Remarks

Represents a read-only 2D rectangle.

The relationship between X1, X2 and Width, and the relationship between Y1, Y2 and Height, depends on whether the object represents a normal (traditional Windows) rectangle, a bounding rectangle, or a pair of points. A traditional rectangle defines its Height as Y2 - Y1, and its Width as X2 - X1. A bounding rectangle is defined slightly differently: the Width is X2 - X1 + e, and the Height is Y2 - Y1 + e, where e is an infitessimal value of type T (e=1 if T is an integer type).

Also, a traditional rectangle is stored as a starting point (X1, Y1) and a size (Width, Height), while a bounding rectangle stores X2 and Y2 instead, not the Width and Height.

Finally, this interface could simply represent a pair of points. In that case, Width and Height return the absolute value of X2-X1 and Y2-Y1 respectively.

A rectangle may or may not require X2 >= X1 and Y2 >= Y1. If X1>X2 or Y1>Y2, the rectangle is said to be "not normalized" and the RectangleExt.IsNormal extension method returns false.

Properties
T	X1 [get]
T	Y1 [get]
T	X2 [get]
T	Y2 [get]
Properties inherited from Loyc.Geometry.ISizeReader< T >
T	Width [get]
	Gets the width of a rectangle (the difference between X coordinates). More...
T	Height [get]
	Gets the height of a rectangle (the difference between Y coordinates). More...