# High-resolution Computer Graphics Using Pascal by Ian O. Angell

By Ian O. Angell

Describes instruments and strategies of computer-generated images resembling shading, shadows, and obvious surfaces. contains many application listings and labored examples. The workouts (over a hundred in all) are written in modular shape for ease of interchanging software capabilities. workouts should be quite simply translated into into different languages resembling simple, C, or FORTRAN. absolutely illustrated.

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This method may also be used to find a perpendicular to a line given in linear equation form. Since ay = bx + c has direction vector (a, b), a perpendicular line has direction vector ( -b, a) which has equation -by = ax + c' for some c' The value of c' does not affect the direction of the line so every value of c' gives a line perpendicular to ay = bx + c. Curves: Analytic (Functional) Representation and Parametric Forms A curve in two-dimensional space can be considered as a relationship between x andy co-ordinate values, the analytic form, or, alternatively the co-ordinates can be individually specified in terms of other variables or parameters, the parametric form.

S (-2x-4-(-2)x2) #J. 2. 2 PROCEDURE ill2(vl,v2,v3,v4:vcclor2 ; VAR v:vcctor2 ; VAR ll;~g:boolc<~n ) ; VAR mu,delt;~ : rc;~l ; BEGIN { Finds the point vector or intersection, 'v', or two lines. y END END ; { or ill2 } You can experiment by creating your own exercises. Direction Vectors * Returning to the use of a vector (d = (x, y) (0, 0), say) representing a direction. J(x 2 + y 2 ), y/v(x 2 + y 2 ))with unit modulus. l from p. Now consider the angles made by direction vectors with various fixed directions.

High-resolution Computer Graphics Using Pascal 40 Since we will only be referring to trees in passing in chapter 17, we include a simple implementation for completeness. We assume that the tree will be ordered, and is created by a stream of integer information. Once created it is used only as a storage structure and it will not be changed! 5. treetop points to the top of the stack. Trees are inherently recursive, but we use a non-recursive stack in order to implement these ideas. New nodes can be added to a tree only as a leaf- that is, a node with no edges leaving it.