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Annotation of Examples/AppKit/ScrollDoodScroll/RulerView.m, revision 1.1.1.1

1.1       root        1: // RulerView.m
                      2: // By Jayson Adams, NeXT Developer Support Team
                      3: // Modified for 3.0 by Ali Ozer, May '92
                      4: // You may freely copy, distribute and reuse the code in this example.
                      5: // NeXT disclaims any warranty of any kind, expressed or implied, as to its
                      6: // fitness for any particular use.
                      7: 
                      8: #import <dpsclient/psops.h>
                      9: #import <math.h>
                     10: 
                     11: #import "RulerView.h"
                     12: 
                     13: @implementation RulerView
                     14: 
                     15: #define INCH_MARK_LENGTH (NX_HEIGHT(&bounds) * 0.75)
                     16: #define HALFINCH_MARK_LENGTH (NX_HEIGHT(&bounds) * 0.5)
                     17: #define QUARTERINCH_MARK_LENGTH (NX_HEIGHT(&bounds) * 0.25)
                     18: 
                     19: - drawSelf:(const NXRect *)rects :(int)rectCount
                     20: {
                     21:     NXCoord start = floor(NX_X(rects) / 72.0) * 72.0;
                     22:     NXCoord end = ceil(NX_MAXX(rects) / 72.0) * 72.0;
                     23: 
                     24:     PSsetgray (NX_LTGRAY);
                     25:     NXRectFill (rects);
                     26:     
                     27:     PSmoveto (start, 1.0);
                     28:     PSlineto (end, 1.0);
                     29:     while (start <= end) {
                     30:        // Userpaths would really help out here. Exercise for the reader...
                     31:        PSmoveto (start, 0.0);
                     32:        PSrlineto (0.0, INCH_MARK_LENGTH);
                     33:        PSmoveto (start + 36.0, 0.0);
                     34:        PSrlineto (0.0, HALFINCH_MARK_LENGTH);
                     35:        PSmoveto (start + 18.0, 0.0);
                     36:        PSrlineto (0.0, QUARTERINCH_MARK_LENGTH);
                     37:        PSmoveto (start + 54.0, 0.0);
                     38:        PSrlineto (0.0, QUARTERINCH_MARK_LENGTH);
                     39:        start += 72.0;
                     40:     }
                     41: 
                     42:     PSsetlinewidth (0.0);
                     43:     PSsetgray (NX_BLACK);
                     44:     PSstroke();
                     45: 
                     46:     return self;
                     47: }
                     48: 
                     49: @end

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