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Annotation of researchv10dc/630/man/src/p_man/man3/jsegment.3l, revision 1.1.1.1

1.1       root        1: .ds ZZ DEVELOPMENT PACKAGE
                      2: .TH JSEGMENT 3L "630 MTG"
                      3: .XE "jline()"
                      4: .XE "jlineto()"
                      5: .XE "jsegment()"
                      6: .SH NAME
                      7: jsegment, jline, jlineto \- draw line on display
                      8: .SH SYNOPSIS
                      9: .B #include <dmd.h>
                     10: .sp
                     11: .B void jsegment (p, q, f) 
                     12: .PP
                     13: .B void jline (p, f)
                     14: .PP
                     15: .B void jlineto (p, f)
                     16: .PP
                     17: .B Point p, q;
                     18: .br
                     19: .B Code f;
                     20: .SH DESCRIPTION
                     21: The
                     22: .I jline
                     23: function
                     24: draws a line in the display bitmap with Code
                     25: .I f
                     26: from the current window point (initially (0, 0) in window coordinates)
                     27: along the relative vector
                     28: .I p
                     29: which is in window coordinates.
                     30: .PP
                     31: The
                     32: .I jlineto
                     33: function
                     34: draws a line in the display bitmap from the current window point 
                     35: to the absolute window coordinate
                     36: .IR p 
                     37: with Code 
                     38: .I f.
                     39: .PP
                     40: The
                     41: .I jsegment
                     42: function
                     43: draws a line in the diplay bitmap from the window coordinate
                     44: .I p
                     45: to the window coordinate
                     46: .IR q 
                     47: with Code
                     48: .I f.
                     49: .PP
                     50: The
                     51: line functions
                     52: .IR jline ,
                     53: .IR jlineto ,
                     54: and
                     55: .I jsegment
                     56: leave the current window point at the end of the line.
                     57: .PP
                     58: .I PtCurrent
                     59: is the global used to refer to the current window point.
                     60: .SH EXAMPLE
                     61: The following program draws three boxes on the screen 
                     62: using three different methods.
                     63: .PP
                     64: .RS 3
                     65: .ft CM
                     66: .nf
                     67: #include <dmd.h>
                     68: 
                     69: main()
                     70: {
                     71:    box(Rect(400,100,600,300));
                     72:    rbox(Rect(0,0,200,200),Pt(0,300));
                     73:    sbox(Rect(400,700,600,900));
                     74:    request(KBD);
                     75:    wait(KBD);
                     76: }
                     77: 
                     78: /* draw absolute */
                     79: box(r)
                     80: Rectangle r;
                     81: {
                     82:    jmoveto (r.origin);
                     83:    jlineto (Pt (r.corner.x, r.origin.y), F_XOR);
                     84:    jlineto (r.corner, F_XOR);
                     85:    jlineto (Pt (r.origin.x, r.corner.y), F_XOR);
                     86:    jlineto (r.origin, F_XOR);
                     87: }
                     88: 
                     89: /* draw relative */
                     90: rbox(r, p)
                     91: Rectangle r;
                     92: Point p;
                     93: {
                     94:    jmove (p);
                     95:    jline (Pt (r.corner.x - r.origin.x, 0), F_XOR);
                     96:    jline (Pt (0, r.corner.y - r.origin.y), F_XOR);
                     97:    jline (Pt (r.origin.x - r.corner.x, 0), F_XOR);
                     98:    jline (Pt (0, r.origin.y - r.corner.y), F_XOR);
                     99: }
                    100: 
                    101: /* draw with segments */
                    102: sbox(r)
                    103: Rectangle r;
                    104: {
                    105:    jsegment (r.origin, Pt(r.corner.x,
                    106:              r.origin.y), F_XOR);
                    107:    jsegment (Pt(r.corner.x, r.origin.y),
                    108:              r.corner, F_XOR);
                    109:    jsegment (r.corner, Pt(r.origin.x,
                    110:              r.corner.y), F_XOR);
                    111:    jsegment (Pt(r.origin.x, r.corner.y),
                    112:              r.origin, F_XOR);
                    113: }
                    114: .fi
                    115: .ft R
                    116: .RE
                    117: .SH SEE ALSO
                    118: globals(3R), pt(3L), segment(3R), structures(3R), transform(3R/3L).

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