source: git/src/avenprcore.cc

Last change on this file was bfa86e2, checked in by Olly Betts <olly@…>, 3 years ago

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1/* avenprcore.cc
2 * Printer independent parts of Survex printer drivers
3 * Copyright (C) 1993-2002,2004,2005,2006,2010,2011,2012,2013,2014,2015,2016 Olly Betts
4 * Copyright (C) 2004 Philip Underwood
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
19 */
20
21#ifdef HAVE_CONFIG_H
22# include <config.h>
23#endif
24
25#include <algorithm>
26#include <math.h>
27
28#include "useful.h"
29#include "avenprcore.h"
30
31#if defined __WXMSW__ || defined __WXMAC__
32# include <wx/dcprint.h>
33#else
34# include <wx/dcps.h>
35#endif
36#include <wx/print.h>
37
38layout::layout(wxPageSetupDialogData* data)
39        : show_mask(0),
40          SkipBlank(false), Border(true), Cutlines(true), Legend(true),
41          title(), datestamp(), Scale(0), rot(0), tilt(0),
42          view(PLAN), scX(1), scY(1), xMin(0), xMax(-1), yMin(0), yMax(-1),
43          pagesX(1), pagesY(1), pages(1), xOrg(0), yOrg(0)
44{
45    if (data) {
46        // Printing.
47
48        // Create a temporary wxPrinterDC/wxPostScriptDC so we can get access
49        // to the size of the printable area in mm to allow us to calculate how
50        // many pages will be needed.
51        //
52        // It may seem like data->GetPaperSize() would tell us this page size
53        // without having to construct a temporary DC, but that just returns
54        // (0, 0) for the size, at least with wxGTK 3.0.2.
55#if defined __WXMSW__ || defined __WXMAC__
56        wxPrinterDC pdc(data->GetPrintData());
57#else
58        wxPostScriptDC pdc(data->GetPrintData());
59#endif
60        // Calculate the size of the printable area in mm to allow us to work
61        // out how many pages will be needed for a given scale.
62        wxSize size = pdc.GetSizeMM();
63        size.DecBy(data->GetMarginBottomRight());
64        size.DecBy(data->GetMarginTopLeft());
65        PaperWidth = size.x;
66        // Allow for our footer.
67        PaperDepth = size.y - FOOTER_HEIGHT_MM;
68    } else {
69        // Exporting.
70        PaperWidth = PaperDepth = 0;
71    }
72}
73
74void
75layout::pages_required() {
76    double image_dx, image_dy;
77    double image_centre_x, image_centre_y;
78    double paper_centre_x, paper_centre_y;
79
80    double allow = 21.0;
81    if (Legend) allow += 30.0;
82    double Sc = 1000 / Scale;
83    image_dx = (xMax - xMin) * Sc;
84    if (PaperWidth > 0.0) {
85        pagesX = (int)ceil((image_dx + 19.0) / PaperWidth);
86    } else {
87        /* paperwidth not fixed (eg window or roll printer/plotter) */
88        pagesX = 1;
89        PaperWidth = image_dx + 19.0;
90    }
91    paper_centre_x = (pagesX * PaperWidth) / 2;
92    image_centre_x = Sc * (xMax + xMin) / 2;
93    xOrg = paper_centre_x - image_centre_x;
94
95    image_dy = (yMax - yMin) * Sc;
96    if (PaperDepth > 0.0) {
97        pagesY = (int)ceil((image_dy + allow) / PaperDepth);
98    } else {
99        /* paperdepth not fixed (eg window or roll printer/plotter) */
100        pagesY = 1;
101        PaperDepth = image_dy + allow;
102    }
103    paper_centre_y = 20 + (pagesY * PaperDepth) / 2;
104    image_centre_y = Sc * (yMax + yMin) / 2;
105    yOrg = paper_centre_y - image_centre_y;
106
107    pages = pagesX * pagesY;
108}
109
110#define DEF_RATIO (1.0/(double)DEFAULT_SCALE)
111
112/* pick a scale which will make it fit in the desired size */
113void
114layout::pick_scale(int x, int y)
115{
116   pagesX = x;
117   pagesY = y;
118   pages = x * y;
119
120   double Sc_x, Sc_y;
121   /*    pagesY = ceil((image_dy+allow)/PaperDepth)
122    * so (image_dy+allow)/PaperDepth <= pagesY < (image_dy+allow)/PaperDepth+1
123    * so image_dy <= pagesY*PaperDepth-allow < image_dy+PaperDepth
124    * and Sc = image_dy / (yMax-yMin)
125    * so Sc <= (pagesY*PaperDepth-allow)/(yMax-yMin) < Sc+PaperDepth/(yMax-yMin)
126    */
127   Sc_x = Sc_y = DEF_RATIO;
128   if (PaperWidth > 0.0 && xMax > xMin)
129      Sc_x = (x * PaperWidth - 19.0) / (xMax - xMin);
130   if (PaperDepth > 0.0 && yMax > yMin) {
131      double allow = 21.0;
132      if (Legend) allow += 30.0;
133      Sc_y = (y * PaperDepth - allow) / (yMax - yMin);
134   }
135
136   Sc_x = std::min(Sc_x, Sc_y) * 0.99; /* shrink by 1% so we don't cock up */
137#if 0 /* this picks a nice (in some sense) ratio, but is too stingy */
138   double E = pow(10.0, floor(log10(Sc_x)));
139   Sc_x = floor(Sc_x / E) * E;
140#endif
141
142   double Scale_exact = 1000.0 / Sc_x;
143
144   /* trim to 2 s.f. (rounding up) */
145   double w = pow(10.0, floor(log10(Scale_exact) - 1.0));
146   Scale = ceil(Scale_exact / w) * w;
147}
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