A Practical Introduction to Computer Graphics by Ian O. Angell (auth.)

By Ian O. Angell (auth.)

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Experiment with these transformations by considering polygons, spirals and other shapes already mentioned. It is important to note that if matrices are read by statements like READ(5, *)A then the matrix is filled by column from the input channel, that is, the data input is understood to be in the order A(l, 1),A(2, 1),A(3, l),A(l, 2), A(2, 2), ... , etc. 4 Clipping and Covering We now have the ability to create graphical objects of arbitrary sizes and complexities in the observer coordinate system.

2 inches and covered by a square with side 2 inches. Both squares are centred at the origin the centre of the cirele of 30 points. 4 THE USE OF CURSORS AND PEN SENSORS Many interactive graphics devices have cursors (moveable crosshairs) and/or pen sensors (for example, light pens), which enable the user to indicate individual points on the device screen or surface. By pressing a special button the keyboard (or other equivalent methods), the coordinates of the point specified by the cursor can be read by the program.

IF INDEX> 0 then ICH will be the Hollerith string, of length INDEX, to be drawn on the screen. In both cases eal:h individual character is drawn in an imaginary square box. The following program will draw in the boxes around example output from SYMBOL in order to demonstrate how the routine works. [ EXAMPLES [ALL [ALL [ALL CALL [ EXAMPLES [ALL [ALL [ALL [ALL ßF PßSITlvE iNDEX. 3; ßF INDEX -1. 5 5 The Coordinate Geometry 01 Three-dimensional Space It is now time to enter the real world of three dimensions.

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