#include <output/charts/plot-chart.h>
-#include <stdio.h>
-#include <plot.h>
-#include <stdarg.h>
-#include <string.h>
-#include <stdio.h>
-#include <float.h>
#include <assert.h>
+#include <float.h>
#include <math.h>
+#include <pango/pango-font.h>
+#include <pango/pango-layout.h>
+#include <pango/pango.h>
+#include <pango/pangocairo.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdio.h>
+#include <string.h>
#include <libpspp/assertion.h>
#include <libpspp/str.h>
#include "xalloc.h"
-const char *const data_colour[N_CHART_COLOURS] =
+#if ! PANGO_VERSION_CHECK (2, 22, 0)
+int pango_layout_get_baseline (PangoLayout *layout);
+
+/* Shamelessly copied from the pango source */
+int
+pango_layout_get_baseline (PangoLayout *layout)
+{
+ int baseline;
+
+ /* XXX this is so inefficient */
+ PangoLayoutIter *iter = pango_layout_get_iter (layout);
+ baseline = pango_layout_iter_get_baseline (iter);
+ pango_layout_iter_free (iter);
+
+ return baseline;
+}
+#endif
+
+
+
+const struct chart_colour data_colour[N_CHART_COLOURS] =
{
- "brown",
- "red",
- "orange",
- "yellow",
- "green",
- "blue",
- "violet",
- "grey",
- "pink"
+ { 165, 42, 42 }, /* brown */
+ { 255, 0, 0 }, /* red */
+ { 255, 165, 0 }, /* orange */
+ { 255, 255, 0 }, /* yellow */
+ { 0, 255, 0 }, /* green */
+ { 0, 0, 255 }, /* blue */
+ { 238, 130, 238 }, /* violet */
+ { 190, 190, 190 }, /* grey */
+ { 255, 192, 203 }, /* pink */
};
+void
+chart_draw_marker (cairo_t *cr, double x, double y, enum marker_type marker,
+ double size)
+{
+ cairo_save (cr);
+ cairo_translate (cr, x, y);
+ cairo_scale (cr, size / 2.0, size / 2.0);
+ cairo_set_line_width (cr, cairo_get_line_width (cr) / (size / 2.0));
+ switch (marker)
+ {
+ case MARKER_CIRCLE:
+ cairo_arc (cr, 0, 0, 1.0, 0, 2 * M_PI);
+ cairo_stroke (cr);
+ break;
+
+ case MARKER_ASTERISK:
+ cairo_move_to (cr, 0, -1.0); /* | */
+ cairo_line_to (cr, 0, 1.0);
+ cairo_move_to (cr, -M_SQRT1_2, -M_SQRT1_2); /* / */
+ cairo_line_to (cr, M_SQRT1_2, M_SQRT1_2);
+ cairo_move_to (cr, -M_SQRT1_2, M_SQRT1_2); /* \ */
+ cairo_line_to (cr, M_SQRT1_2, -M_SQRT1_2);
+ cairo_stroke (cr);
+ break;
+
+ case MARKER_SQUARE:
+ cairo_rectangle (cr, -1.0, -1.0, 2.0, 2.0);
+ cairo_stroke (cr);
+ break;
+ }
+ cairo_restore (cr);
+}
+void
+chart_label (cairo_t *cr, int horz_justify, int vert_justify, double font_size,
+ const char *string)
+{
+ PangoFontDescription *desc;
+ PangoLayout *layout;
+ double x, y;
+
+ desc = pango_font_description_from_string ("sans serif");
+ if (desc == NULL)
+ {
+ cairo_new_path (cr);
+ return;
+ }
+ pango_font_description_set_absolute_size (desc, font_size * PANGO_SCALE);
+
+ cairo_save (cr);
+ cairo_get_current_point (cr, &x, &y);
+ cairo_translate (cr, x, y);
+ cairo_move_to (cr, 0, 0);
+ cairo_scale (cr, 1.0, -1.0);
+
+ layout = pango_cairo_create_layout (cr);
+ pango_layout_set_font_description (layout, desc);
+ pango_layout_set_text (layout, string, -1);
+ if (horz_justify != 'l')
+ {
+ int width_pango;
+ double width;
+
+ pango_layout_get_size (layout, &width_pango, NULL);
+ width = (double) width_pango / PANGO_SCALE;
+ if (horz_justify == 'r')
+ cairo_rel_move_to (cr, -width, 0);
+ else
+ cairo_rel_move_to (cr, -width / 2.0, 0);
+ }
+ if (vert_justify == 'x')
+ {
+ int baseline_pango = pango_layout_get_baseline (layout);
+ double baseline = (double) baseline_pango / PANGO_SCALE;
+ cairo_rel_move_to (cr, 0, -baseline);
+ }
+ else if (vert_justify != 't')
+ {
+ int height_pango;
+ double height;
+
+ pango_layout_get_size (layout, NULL, &height_pango);
+ height = (double) height_pango / PANGO_SCALE;
+ if (vert_justify == 'b')
+ cairo_rel_move_to (cr, 0, -height);
+ else if (vert_justify == 'c')
+ cairo_rel_move_to (cr, 0, -height / 2.0);
+ }
+ pango_cairo_show_layout (cr, layout);
+ g_object_unref (layout);
+
+ cairo_restore (cr);
+
+ cairo_new_path (cr);
+
+ pango_font_description_free (desc);
+}
/* Draw a tick mark at position
If label is non zero, then print it at the tick mark
*/
void
-draw_tick (plPlotter *lp, const struct chart_geometry *geom,
+draw_tick (cairo_t *cr, const struct chart_geometry *geom,
enum tick_orientation orientation,
double position,
const char *label, ...)
{
const int tickSize = 10;
+ double x, y;
- pl_savestate_r (lp);
- pl_move_r (lp, geom->data_left, geom->data_bottom);
+ cairo_move_to (cr, geom->data_left, geom->data_bottom);
if (orientation == TICK_ABSCISSA)
- pl_flinerel_r (lp, position, 0, position, -tickSize);
+ {
+ cairo_rel_move_to (cr, position, 0);
+ cairo_rel_line_to (cr, 0, -tickSize);
+ }
else if (orientation == TICK_ORDINATE)
- pl_flinerel_r (lp, 0, position, -tickSize, position);
+ {
+ cairo_rel_move_to (cr, 0, position);
+ cairo_rel_line_to (cr, -tickSize, 0);
+ }
else
NOT_REACHED ();
+ cairo_get_current_point (cr, &x, &y);
+
+ cairo_stroke (cr);
if (label != NULL)
{
va_list ap;
char *s;
+ cairo_move_to (cr, x, y);
+
va_start (ap, label);
s = xvasprintf (label, ap);
if (orientation == TICK_ABSCISSA)
- pl_alabel_r (lp, 'c', 't', s);
+ chart_label (cr, 'c', 't', geom->font_size, s);
else if (orientation == TICK_ORDINATE)
{
if (fabs (position) < DBL_EPSILON)
- pl_moverel_r (lp, 0, 10);
- pl_alabel_r (lp, 'r', 'c', s);
+ cairo_rel_move_to (cr, 0, 10);
+ chart_label (cr, 'r', 'c', geom->font_size, s);
}
free (s);
va_end (ap);
}
-
- pl_restorestate_r (lp);
}
/* Write the title on a chart*/
void
-chart_write_title (plPlotter *lp, const struct chart_geometry *geom,
+chart_write_title (cairo_t *cr, const struct chart_geometry *geom,
const char *title, ...)
{
va_list ap;
char *s;
- pl_savestate_r (lp);
- pl_ffontsize_r (lp, geom->font_size * 1.5);
- pl_move_r (lp, geom->data_left, geom->title_bottom);
+ cairo_save (cr);
+ cairo_move_to (cr, geom->data_left, geom->title_bottom);
va_start(ap, title);
s = xvasprintf (title, ap);
- pl_alabel_r (lp, 0, 0, s);
+ chart_label (cr, 'l', 'x', geom->font_size * 1.5, s);
free (s);
va_end (ap);
- pl_restorestate_r (lp);
+ cairo_restore (cr);
}
/* Set the scale for the abscissa */
void
-chart_write_xscale (plPlotter *lp, struct chart_geometry *geom,
+chart_write_xscale (cairo_t *cr, struct chart_geometry *geom,
double min, double max, int ticks)
{
double x;
fabs(geom->x_max - geom->x_min);
for (x = geom->x_min; x <= geom->x_max; x += tick_interval)
- draw_tick (lp, geom, TICK_ABSCISSA,
+ draw_tick (cr, geom, TICK_ABSCISSA,
(x - geom->x_min) * geom->abscissa_scale, "%g", x);
}
/* Set the scale for the ordinate */
void
-chart_write_yscale (plPlotter *lp, struct chart_geometry *geom,
+chart_write_yscale (cairo_t *cr, struct chart_geometry *geom,
double smin, double smax, int ticks)
{
double y;
/ fabs (geom->y_max - geom->y_min));
for (y = geom->y_min; y <= geom->y_max; y += tick_interval)
- draw_tick (lp, geom, TICK_ORDINATE,
+ draw_tick (cr, geom, TICK_ORDINATE,
(y - geom->y_min) * geom->ordinate_scale, "%g", y);
}
/* Write the abscissa label */
void
-chart_write_xlabel (plPlotter *lp, const struct chart_geometry *geom,
+chart_write_xlabel (cairo_t *cr, const struct chart_geometry *geom,
const char *label)
{
- pl_savestate_r (lp);
- pl_move_r (lp, geom->data_left, geom->abscissa_top);
- pl_alabel_r (lp, 0, 't', label);
- pl_restorestate_r (lp);
+ cairo_move_to (cr, geom->data_left, geom->abscissa_top);
+ chart_label (cr, 'l', 't', geom->font_size, label);
}
/* Write the ordinate label */
void
-chart_write_ylabel (plPlotter *lp, const struct chart_geometry *geom,
+chart_write_ylabel (cairo_t *cr, const struct chart_geometry *geom,
const char *label)
{
- pl_savestate_r (lp);
- pl_move_r (lp, geom->data_bottom, geom->ordinate_right);
- pl_textangle_r (lp, 90);
- pl_alabel_r (lp, 0, 0, label);
- pl_restorestate_r(lp);
+ cairo_save (cr);
+ cairo_translate (cr, -geom->data_bottom, -geom->ordinate_right);
+ cairo_move_to (cr, 0, 0);
+ cairo_rotate (cr, M_PI / 2.0);
+ chart_label (cr, 'l', 'x', geom->font_size, label);
+ cairo_restore (cr);
+}
+
+
+void
+chart_write_legend (cairo_t *cr, const struct chart_geometry *geom)
+{
+ int i;
+ const int vstep = geom->font_size * 2;
+ const int xpad = 10;
+ const int ypad = 10;
+ const int swatch = 20;
+ const int legend_top = geom->data_top;
+ const int legend_bottom = legend_top -
+ (vstep * geom->n_datasets + 2 * ypad );
+
+ cairo_save (cr);
+
+ cairo_rectangle (cr, geom->legend_left, legend_top,
+ geom->legend_right - xpad - geom->legend_left,
+ legend_bottom - legend_top);
+ cairo_stroke (cr);
+
+ for (i = 0 ; i < geom->n_datasets ; ++i )
+ {
+ const int ypos = legend_top - vstep * (i + 1);
+ const int xpos = geom->legend_left + xpad;
+ const struct chart_colour *colour;
+
+ cairo_move_to (cr, xpos, ypos);
+
+ cairo_save (cr);
+ colour = &data_colour [ i % N_CHART_COLOURS];
+ cairo_set_source_rgb (cr,
+ colour->red / 255.0,
+ colour->green / 255.0,
+ colour->blue / 255.0);
+ cairo_rectangle (cr, xpos, ypos, swatch, swatch);
+ cairo_fill_preserve (cr);
+ cairo_stroke (cr);
+ cairo_restore (cr);
+
+ cairo_move_to (cr, xpos + swatch * 1.5, ypos);
+ chart_label (cr, 'l', 'x', geom->font_size, geom->dataset[i]);
+ }
+
+ cairo_restore (cr);
}
projects / pspp-builds.git / blobdiff