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Lecture 1 - Projections and Transformations (slides)

# 7 47 graphics lecture 1 slide 13 7 47 normalisation

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Unformatted text preview: (Xw Wxmin )(Vxmax Vxmin ) + V + Vxmin v xmin Wxmax Wxmin Wxmax Wxmin with a similar expression for Yv with a similar expression for Yv with a similar expression for Yv •  with a similar expression for Yv ! 7 / 47 Graphics Lecture 1: Slide 13! 7 / 47 Normalisation Normalisation! •  So we have two equations for calculating pixel So weoordinates (Xv,Yv). ! calculating pixel coordinates (Xv , Yv ). c have 2 equations for •  We can simplify them to form a simple pair of linear We can simplify !them to form a simple pair of linear equations: equations: Xv = AXw + B Yv = CYw + D •  Here A, B, C and D are constants that deﬁne the Where A, B, C and .D ,are constants found fromthe normalisation. normalisation A B, C, D are that deﬁne the known values of Wxmin, Vxmin, ... A, B, C, D are found from the known values of Wxmin , Vxmin , . . . Graphics Lecture 1: Slide 14! Input for graphics systems! •  An input event occurs when something changes, e.g. a mouse is moved or a button is pr...
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