By Ian O. Angell (auth.)
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Extra resources for A Practical Introduction to Computer Graphics
Q ) Ip 11 q I Obviously if p and q are mutually perpendicular directions then p • q The general point x on a plane is given by the vector equation =O. 2). If ais any given point on the plane then from the above equation we know that n· a = k and thus, by replacing k, this equation may be rewritten as n •x =n •a or n· (x - a) =0 This latter fact is obvious from the property of the dot product just mentioned, namely that two mutually perpendicular lines have zero dot product. For any point x in the plane, x - a may be conside~ed as a direction vector of a line in the plane and, since n is normal to the plane and hence normal (that is, perpendicular) to every line in the plane, then n • (x - a) =O.
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. A sub routine call, probably of the form CALL CURSOR(XC, YC) will make the program pause until the key is depressed, when the coordinates of the point specified by the cursor are identified with the values of the variables XC and yc.
Finally it may be decided that a figure is unnecessary - it is pinpointed by the cursor and deleted. MENUS When the programmer has decided to draw, drag or delete, the required information has to be input. Of course it is always possible for the program to read the information from a keyboard; however, this tends to be tedious and error-prone, and so another method has been devised - the menu. A list of possible choices is drawn on the screen (or it may be a permanent fixture on a pad); each choice has its own box, which must be 'ticked' by moving the cursor (or pen sensor) into this area before the correct alteration can be made to the diagram.