From fe996324d365f3a35e59dda8e10db5327de444e8 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch
Date: Sat, 8 Jan 2011 16:41:55 +0100
Subject: Take a better approach to drawing the grid.
If the diagram is zoomed out too much, just use bigger steps between dots.
---
src/ld-canvas.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
(limited to 'src')
diff --git a/src/ld-canvas.c b/src/ld-canvas.c
index b008fb8..fdec62b 100644
--- a/src/ld-canvas.c
+++ b/src/ld-canvas.c
@@ -1072,11 +1072,13 @@ on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
static void
draw_grid (GtkWidget *widget, DrawData *data)
{
+ gdouble grid_step;
gdouble x_init, y_init;
gdouble x, y;
- if (data->scale < 2)
- return;
+ grid_step = data->scale;
+ while (grid_step < 5)
+ grid_step *= 5;
ld_canvas_color_apply (COLOR_GET (data->self, COLOR_GRID), data->cr);
cairo_set_line_width (data->cr, 1);
@@ -1090,10 +1092,10 @@ draw_grid (GtkWidget *widget, DrawData *data)
/* Iterate over all the points. */
for (x = x_init; x <= data->exposed_rect.x + data->exposed_rect.width;
- x += data->scale)
+ x += grid_step)
{
for (y = y_init; y <= data->exposed_rect.y + data->exposed_rect.height;
- y += data->scale)
+ y += grid_step)
{
cairo_move_to (data->cr, x, y);
cairo_line_to (data->cr, x, y);
--
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