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Use GTK_UNIT_INCH when printing to provide consistency across OS

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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>
This commit is contained in:
Lubomir I. Ivanov 2012-09-11 11:16:34 +03:00 • committed by Dirk Hohndel
parent 38d49bf041
commit 50eac41129
4 changed files with 47 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

38
profile.c
View file

@ -16,6 +16,11 @@
int selected_dive = 0;
char zoomed_plot = 0;
static double plot_scale = SCALE_SCREEN;
#define cairo_set_line_width_scaled(cr, w) \
cairo_set_line_width((cr), (w) * plot_scale);
typedef enum { STABLE, SLOW, MODERATE, FAST, CRAZY } velocity_t;
/* Plot info with smoothing, velocity indication
@ -245,7 +250,7 @@ static void plot_text(struct graphics_context *gc, const text_render_options_t *
vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
cairo_set_font_size(cr, tro->size);
cairo_set_font_size(cr, tro->size * plot_scale);
cairo_font_extents(cr, &fe);
cairo_text_extents(cr, buffer, &extents);
dx = tro->hpos * extents.width + extents.x_bearing;
@ -485,7 +490,7 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
gc->leftx = 0; gc->rightx = maxtime;
gc->topy = 0; gc->bottomy = 1.0;
set_source_rgba(gc, TIME_GRID);
cairo_set_line_width(gc->cr, 2);
cairo_set_line_width_scaled(gc->cr, 2);
for (i = incr; i < maxtime; i += incr) {
move_to(gc, i, 0);
@ -542,13 +547,13 @@ static void plot_depth_profile(struct graphics_context *gc, struct plot_info *pi
gc->topy = 0; gc->bottomy = maxdepth;
cairo_pattern_t *pat;
pat = cairo_pattern_create_linear (0.0, 0.0, 0.0, 256.0);
pat = cairo_pattern_create_linear (0.0, 0.0, 0.0, 256.0 * plot_scale);
pattern_add_color_stop_rgba (gc, pat, 1, DEPTH_BOTTOM);
pattern_add_color_stop_rgba (gc, pat, 0, DEPTH_TOP);
cairo_set_source(gc->cr, pat);
cairo_pattern_destroy(pat);
cairo_set_line_width(gc->cr, 2);
cairo_set_line_width_scaled(gc->cr, 2);
entry = pi->entry;
move_to(gc, 0, 0);
@ -655,7 +660,7 @@ static void plot_temperature_profile(struct graphics_context *gc, struct plot_in
if (!setup_temperature_limits(gc, pi))
return;
cairo_set_line_width(gc->cr, 2);
cairo_set_line_width_scaled(gc->cr, 2);
set_source_rgba(gc, TEMP_PLOT);
for (i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
@ -730,7 +735,7 @@ static void plot_cylinder_pressure(struct graphics_context *gc, struct plot_info
if (!get_cylinder_pressure_range(gc, pi))
return;
cairo_set_line_width(gc->cr, 2);
cairo_set_line_width_scaled(gc->cr, 2);
for (i = 0; i < pi->nr; i++) {
int mbar;
@ -1374,13 +1379,28 @@ static struct plot_info *create_plot_info(struct dive *dive, int nr_samples, str
return analyze_plot_info(pi);
}
void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, struct dive *dive)
static void plot_set_scale(scale_mode_t scale)
{
switch (scale) {
default:
case SC_SCREEN:
plot_scale = SCALE_SCREEN;
break;
case SC_PRINT:
plot_scale = SCALE_PRINT;
break;
}
}
void plot(struct graphics_context *gc, cairo_rectangle_t *drawing_area, struct dive *dive, scale_mode_t scale)
{
struct plot_info *pi;
static struct sample fake[4];
struct sample *sample = dive->sample;
int nr = dive->samples;
plot_set_scale(scale);
if (!nr) {
/* The dive has no samples, so create a few fake ones. This assumes an
ascent/descent rate of 9 m/min, which is just below the limit for FAST. */
@ -1401,7 +1421,7 @@ void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, stru
pi = create_plot_info(dive, nr, sample);
cairo_translate(gc->cr, drawing_area->x, drawing_area->y);
cairo_set_line_width(gc->cr, 1);
cairo_set_line_width_scaled(gc->cr, 1);
cairo_set_line_cap(gc->cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_join(gc->cr, CAIRO_LINE_JOIN_ROUND);
@ -1435,7 +1455,7 @@ void plot(struct graphics_context *gc, cairo_rectangle_int_t *drawing_area, stru
gc->topy = 0; gc->bottomy = 1.0;
set_source_rgba(gc, BOUNDING_BOX);
cairo_set_line_width(gc->cr, 1);
cairo_set_line_width_scaled(gc->cr, 1);
move_to(gc, 0, 0);
line_to(gc, 0, 1);
line_to(gc, 1, 1);