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authorPřemysl Janouch <p.janouch@gmail.com>2011-02-01 17:21:08 +0100
committerPřemysl Janouch <p.janouch@gmail.com>2011-02-01 17:21:08 +0100
commit539f5378462670d10ea6500a7980f3a7f84fe0d5 (patch)
treef6297c6032321fd4ca9976a3ac3c3eb95c75ba53
parenta967a2c3b8cae595d6a9114f4933a28c4818959a (diff)
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Fix drawing of the grid.
-rw-r--r--liblogdiag/ld-canvas.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/liblogdiag/ld-canvas.c b/liblogdiag/ld-canvas.c
index 1d05b4b..420232d 100644
--- a/liblogdiag/ld-canvas.c
+++ b/liblogdiag/ld-canvas.c
@@ -1339,12 +1339,17 @@ static void
draw_grid (GtkWidget *widget, DrawData *data)
{
gdouble grid_step;
+ gint grid_factor;
gdouble x_init, y_init;
gdouble x, y;
grid_step = data->scale;
+ grid_factor = 1;
while (grid_step < 5)
+ {
grid_step *= 5;
+ grid_factor *= 5;
+ }
ld_canvas_color_apply (COLOR_GET (data->self, COLOR_GRID), data->cr);
cairo_set_line_width (data->cr, 1);
@@ -1353,8 +1358,14 @@ draw_grid (GtkWidget *widget, DrawData *data)
/* Get coordinates of the top-left point. */
ld_canvas_widget_to_diagram_coords (data->self,
data->exposed_rect.x, data->exposed_rect.y, &x_init, &y_init);
+
+ x_init = ceil (x_init);
+ x_init = x_init - (gint) x_init % grid_factor;
+ y_init = ceil (y_init);
+ y_init = y_init - (gint) y_init % grid_factor;
+
ld_canvas_diagram_to_widget_coords (data->self,
- ceil (x_init), ceil (y_init), &x_init, &y_init);
+ x_init, y_init, &x_init, &y_init);
/* Iterate over all the points. */
for (x = x_init; x <= data->exposed_rect.x + data->exposed_rect.width;