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line-visualizer-row: use cairo_curve_to()

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This makes our line graph match more closely to the design
coming from Builder's cpu graph.
This commit is contained in:
Christian Hergert
2016-09-26 21:57:33 -07:00
parent 4bdbc46381
commit 573ba7bf51
1 changed files with 26 additions and 28 deletions
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54
lib/sp-line-visualizer-row.c
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@ -778,47 +778,45 @@ sp_line_visualizer_row_render_worker (GTask *task,
goto cleanup;
}
/*
* Flip the coordinate space so that we can just use the x,y pairs
* as our position between 0.0 and 1.0 and have both the direction
* and the placement correct.
*/
/* Flip the coordinate space so that 0,0 is in the bottom left. */
cairo_translate (cr, 0, render->height);
cairo_scale (cr, render->width, -render->height);
cairo_scale (cr, 1.0, -1.0);
for (guint i = 0; i < render->lines->len; i++)
{
const LineInfo *info = &g_array_index (render->lines, LineInfo, i);
const LineInfo *line_info = &g_array_index (render->lines, LineInfo, i);
const Point *points;
guint n_points;
points = point_cache_get_points (render->cache, info->id, &n_points);
points = point_cache_get_points (render->cache, line_info->id, &n_points);
cairo_move_to (cr, 0, 0);
for (guint j = 0; j < n_points; j++)
if (n_points > 0)
{
const Point *p = &points[i];
gdouble last_x = points[0].x * render->width;
gdouble last_y = points[0].y * render->height;
cairo_line_to (cr, p->x, p->y);
cairo_move_to (cr, last_x, last_y);
if G_UNLIKELY (j + 1 == n_points)
for (guint j = 1; j < n_points; j++)
{
gdk_cairo_set_source_rgba (cr, &info->foreground);
cairo_set_line_width (cr, info->line_width / (gdouble)render->height);
cairo_stroke_preserve (cr);
cairo_line_to (cr, p->x, 0.0);
}
}
gdouble x = points[j].x * render->width;
gdouble y = points[j].y * render->height;
if (n_points > 0 && info->background.alpha > 0)
{
/*
* Close the path and fill if nencessary.
*/
cairo_line_to (cr, 0, 0);
gdk_cairo_set_source_rgba (cr, &info->background);
cairo_fill (cr);
cairo_curve_to (cr,
last_x + ((x - last_x) / 2),
last_y,
last_x + ((x - last_x) / 2),
y,
x,
y);
last_x = x;
last_y = y;
}
cairo_set_line_width (cr, line_info->line_width);
gdk_cairo_set_source_rgba (cr, &line_info->foreground);
cairo_stroke (cr);
}
}