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50eac41129
Tests have shown that the most multi-platform way to do printing with GTK is to use GTK_UNIT_INCH (or GTK_UNIT_MM) with GtkPrintOperation. Tested on Linux, OSX, Windows. However this requires the appropriate scaling for Pango and Cairo to be done, with separate plotting logic for printing and drawing on the screen. To achieve that, profile.c:plot() now accepts a scaling parameter from type "scale_mode_t" defined in "display.h". Also due to new scale, small decimal numbers (such as 6.12345) cannot be well stored in "cairo_rectangle_int_t" therefore it is replaced with "cairo_rectangle_t", which uses doubles to provide Cairo with a drawing area. Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com> Minor whitespace cleanup. Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
42 lines
1 KiB
C
42 lines
1 KiB
C
#ifndef DISPLAY_H
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#define DISPLAY_H
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#include <cairo.h>
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#define DPI_SCREEN 72.0
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#define SCALE_SCREEN 1.0
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#define SCALE_PRINT (1.0 / DPI_SCREEN)
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extern void repaint_dive(void);
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extern void do_print(void);
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/*
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* Cairo scaling really is horribly horribly mis-designed.
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*
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* Which is sad, because I really like Cairo otherwise. But
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* the fact that the line width is scaled with the same scale
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* as the coordinate system is a f*&%ing disaster. So we
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* can't use it, and instead have this butt-ugly wrapper thing..
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*/
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struct graphics_context {
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int printer;
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cairo_t *cr;
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double maxx, maxy;
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double leftx, rightx;
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double topy, bottomy;
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};
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typedef enum { SC_SCREEN, SC_PRINT } scale_mode_t;
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extern void plot(struct graphics_context *gc, cairo_rectangle_t *drawing_area, struct dive *dive, scale_mode_t scale);
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extern void init_profile_background(struct graphics_context *gc);
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extern void attach_tooltip(int x, int y, int w, int h, const char *text);
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struct options {
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enum { PRETTY, TABLE } type;
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int print_selected;
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};
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extern char zoomed_plot;
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#endif
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