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a6cardlabels.c
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a6cardlabels.c
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/* a6cardlabels --- plot labelling for A6 postcards 2020-08-23 */
/* Copyright (c) 2020 John Honniball, Froods Software Development */
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#include "hpgllib.h"
void postcard_port(const double x, const double y, const double wd, const double ht, const double maxx, const double maxy);
void postcard_land(const double x, const double y, const double wd, const double ht, const double maxx, const double maxy);
int main(int argc, char * const argv[])
{
int opt;
int i, j;
bool portrait;
double x, y;
double dx, dy;
int nx, ny;
double maxx, maxy;
double trueWidthmm;
double trueHeightmm;
double borderx;
double bordery;
PlotInfo_t info;
while ((opt = getopt(argc, argv, "no:p:q:s:t:v:")) != -1) {
switch (opt) {
case 's':
case 'n':
case 'o':
case 'p':
case 'q':
case 'v':
plotopt(opt, optarg);
break;
case 't': /* Suppress title, which would spoil the lower-left postcard */
break;
default: /* '?' */
fprintf(stderr, "Usage: %s [-p pen] [-q plotter] [-s <size>] [-t title]\n", argv[0]);
fprintf(stderr, " <size> ::= A1 | A2 | A3 | A4 | A5 | A6\n");
exit(EXIT_FAILURE);
}
}
if (plotbegin(0) < 0) {
fputs("Failed to initialise HPGL library\n", stderr);
exit(EXIT_FAILURE);
}
if (getplotinfo(&info, sizeof (info)) < 0) {
fputs("Failed to get plot information\n", stderr);
exit(EXIT_FAILURE);
}
maxx = info.widthInUnits;
maxy = info.heightInUnits;
switch (info.paperSize) {
case ISO_A3:
nx = 4;
ny = 2;
trueWidthmm = 420;
trueHeightmm = 297;
portrait = true;
break;
case ISO_A4:
nx = 2;
ny = 2;
trueWidthmm = 297;
trueHeightmm = 210;
portrait = false;
break;
case ISO_A5:
nx = 2;
ny = 1;
trueWidthmm = 210;
trueHeightmm = 148;
portrait = true;
break;
case ISO_A6:
nx = 1;
ny = 1;
trueWidthmm = 184;
trueHeightmm = 105;
portrait = false;
break;
}
borderx = (trueWidthmm - info.widthInmm) / 2.0;
bordery = (trueHeightmm - info.heightInmm) / 2.0;
dx = (trueWidthmm * info.unitsPermm) / (double)nx;
dy = (trueHeightmm * info.unitsPermm) / (double)ny;
for (i = 1; i < nx; i++) {
x = (dx * (double)i) - (borderx * info.unitsPermm);
moveto(x, 0);
lineto(x, maxy);
}
for (i = 1; i < ny; i++) {
y = (dy * (double)i) - (bordery * info.unitsPermm);
moveto(0, y);
lineto(maxx, y);
}
for (i = 0; i < nx; i++)
for (j = 0; j < ny; j++) {
x = (dx * (double)i) - (borderx * info.unitsPermm);
y = (dy * (double)j) - (bordery * info.unitsPermm);
if (portrait)
postcard_port(x, y, dx, dy, maxx, maxy);
else
postcard_land(x, y, dx, dy, maxx, maxy);
}
plotend();
return (0);
}
/* postcard_port --- draw a postcard label at (x, y) in portrait */
void postcard_port(const double x, const double y, const double wd, const double ht, const double maxx, const double maxy)
{
int i;
bool right = true;
bool bottom = true;
double yc = y + (ht / 2.0);
double x1 = x + (wd / 16.0);
double x2 = x + wd - (wd / 16.0);
double sx2 = x + wd - (5.0 * 40.0);
double sy2 = y + (5.0 * 40.0);
double sx1 = sx2 - (22.0 * 40.0);
double sy1 = sy2 + (19.0 * 40.0);
double ax = sx1 - (12.0 * 40.0);
double ay1 = yc - (5.0 * 40.0);
double ay2 = y + (5.0 * 40.0);
if (x1 < 0.0)
x1 = 0.0;
if (x2 > maxx)
x2 = maxx;
if (sx2 > maxx) {
sx2 = maxx;
right = false;
}
if (sy2 > maxy)
sy2 = maxy;
if (sy2 < 0.0) {
sy2 = 0.0;
bottom = false;
}
if (ay2 < 0.0)
ay2 = 0.0;
moveto(x1, yc);
lineto(x2, yc);
moveto(sx1, sy1);
lineto(sx1, sy2); /* Left side */
if (bottom)
lineto(sx2, sy2); /* Bottom */
else
moveto(sx2, sy2);
if (right)
lineto(sx2, sy1); /* Right side */
else
moveto(sx2, sy1);
lineto(sx1, sy1); /* Top */
for (i = 0; i < 5; i++) {
moveto(ax - (12.0 * 40.0) * (double)i, ay1);
lineto(ax - (12.0 * 40.0) * (double)i, ay2);
}
}
/* postcard_land --- draw a postcard label at (x, y) in landscape */
void postcard_land(const double x, const double y, const double wd, const double ht, const double maxx, const double maxy)
{
}