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Loyc.Geometry.IRectangleReader< T > Interface Template Reference

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


Source file:
Inheritance diagram for Loyc.Geometry.IRectangleReader< T >:
Loyc.Geometry.ISizeReader< T > Loyc.Geometry.IRectangle3Reader< T > Loyc.Geometry.IRectangleBase< T > Loyc.Geometry.IRectangle3Base< T > Loyc.Geometry.IRectangle< T > Loyc.Geometry.IRectangle3Base< T > Loyc.Geometry.IRectangle3< T > Loyc.Geometry.BoundingBox< T > Loyc.Geometry.IRectangle3< 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

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