2D TRANSFORMATIONS –TRANSLATION SCALING
seminar class Active In SP Posts: 5,361 Joined: Feb 2011 
16022011, 11:36 AM
submitted by: CHITTESH KHILNANI cad_cam final.ppt (Size: 601 KB / Downloads: 49) 2D TRANSFORMATIONS –TRANSLATION SCALING 2D Transformation Given a 2D object, transformation is to change the object’s Position (translation) Size (scaling) Orientation (rotation) Shapes (shear) Apply a sequence of matrix multiplication to the object vertices Translation Moving an object is called a translation. We translate a point by adding to the x and y coordinates, respectively, the amount the point should be shifted in the x and y directions. We translate an object by translating each vertex in the object. Reposition a point along a straight line Given a point (x,y), and the translation distance (tx,ty) 3x3 2D Translation Matrix 2D Scaling o Changing the size of an object is called a scale. o We scale an object by scaling the x and y coordinates of each vertex in the object. o Alter the size of an object by a scaling factor (Sx, Sy) Why use 3x3 matrices? So that we can perform all transformations using matrix/vector multiplications This allows us to premultiply all the matrices together The point (x,y) needs to be represented as (x,y,1) > this is called Homogeneous coordinates! Homogeneous Coordinates Although the formulas we have shown are usually the most efficient way to implement programs to do scales and translations, it is easier to use matrix transformations to represent and manipulate them. 



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