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Add draw_slider() to remove some common code from dial_snapshot()

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This commit is contained in:
Geoffrey D. Bennett
2024-01-27 11:09:36 +10:30
parent 9fc4c7c6e1
commit 72d45a0987
1 changed files with 17 additions and 16 deletions
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33
src/gtkdial.c
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@@ -531,6 +531,19 @@ static void cairo_add_stop_rgb_dim(
cairo_pattern_add_color_stop_rgb(pat, offset, r, g, b);
}
static void draw_slider(
cairo_t *cr,
struct dial_properties *p,
double radius,
double thickness,
double alpha
) {
cairo_arc(cr, p->cx, p->cy, radius, ANGLE_START, p->angle);
cairo_set_line_width(cr, thickness);
cairo_set_source_rgba_dim(cr, 1, 1, 1, alpha, p->dim);
cairo_stroke(cr);
}
static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
GtkDial *dial = GTK_DIAL(widget);
@@ -556,16 +569,10 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
if (p.valp > 0.0) {
// outside value shadow
cairo_arc(cr, p.cx, p.cy, background_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, p.slider_thickness / 2);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.1, p.dim);
cairo_stroke(cr);
draw_slider(cr, &p, background_radius, p.slider_thickness / 2, 0.1);
// value blur 2
cairo_arc(cr, p.cx, p.cy, slider_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, 6);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.3, p.dim);
cairo_stroke(cr);
draw_slider(cr, &p, slider_radius, 6, 0.3);
}
// draw line to zero db
@@ -603,16 +610,10 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
if (p.valp > 0.0) {
// value blur 1
cairo_arc(cr, p.cx, p.cy, slider_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, 4);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.5, p.dim);
cairo_stroke(cr);
draw_slider(cr, &p, slider_radius, 4, 0.5);
// value
cairo_arc(cr, p.cx, p.cy, slider_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, 2);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 1, p.dim);
cairo_stroke(cr);
draw_slider(cr, &p, slider_radius, 2, 1);
}
// fill the circle