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public class Astal.CircularProgress : Gtk.Bin {
public double start_at { get; set; }
public double end_at { get; set; }
public double value { get; set; }
public bool inverted { get; set; }
public bool rounded { get; set; }
construct {
notify["start-at"].connect(queue_draw);
notify["end-at"].connect(queue_draw);
notify["value"].connect(queue_draw);
notify["inverted"].connect(queue_draw);
notify["rounded"].connect(queue_draw);
notify["child"].connect(queue_draw);
}
static construct {
set_css_name("circular-progress");
}
public override void get_preferred_height(out int minh, out int nath) {
var val = get_style_context().get_property("min-height", Gtk.StateFlags.NORMAL);
if (val.get_int() <= 0) {
minh = 40;
nath = 40;
}
minh = val.get_int();
nath = val.get_int();
}
public override void get_preferred_width(out int minw, out int natw) {
var val = get_style_context().get_property("min-width", Gtk.StateFlags.NORMAL);
if (val.get_int() <= 0) {
minw = 40;
natw = 40;
}
minw = val.get_int();
natw = val.get_int();
}
private double to_radian(double percentage) {
percentage = Math.floor(percentage * 100);
return (percentage / 100) * (2 * Math.PI);
}
private bool is_full_circle(double start, double end, double epsilon = 1e-10) {
// Ensure that start and end are between 0 and 1
start = (start % 1 + 1) % 1;
end = (end % 1 + 1) % 1;
// Check if the difference between start and end is close to 1
return Math.fabs(start - end) <= epsilon;
}
private double scale_arc_value(double start, double end, double value) {
// Ensure that start and end are between 0 and 1
start = (start % 1 + 1) % 1;
end = (end % 1 + 1) % 1;
// Calculate the length of the arc
var arc_length = end - start;
if (arc_length < 0)
arc_length += 1; // Adjust for circular representation
// Calculate the position on the arc based on the percentage value
var scaled = arc_length + value;
// Ensure the position is between 0 and 1
return (scaled % 1 + 1) % 1;
}
private double min(double[] arr) {
double min = arr[0];
foreach(var i in arr)
if (min > i) min = i;
return min;
}
private double max(double[] arr) {
double max = arr[0];
foreach(var i in arr)
if (max < i) max = i;
return max;
}
public override bool draw(Cairo.Context cr) {
Gtk.Allocation allocation;
get_allocation(out allocation);
var styles = get_style_context();
var width = allocation.width;
var height = allocation.height;
var thickness = styles.get_property("font-size", Gtk.StateFlags.NORMAL).get_double();
var margin = styles.get_margin(Gtk.StateFlags.NORMAL);
var fg = styles.get_color(Gtk.StateFlags.NORMAL);
var bg = styles.get_background_color(Gtk.StateFlags.NORMAL);
var bg_stroke = thickness + min({margin.bottom, margin.top, margin.left, margin.right});
var fg_stroke = thickness;
var radius = min({width, height}) / 2.0 - max({bg_stroke, fg_stroke}) / 2.0;
var center_x = width / 2;
var center_y = height / 2;
var start_background = to_radian(start_at);
var end_background = to_radian(end_at);
var ranged_value = value + start_at;
var is_circle = is_full_circle(this.start_at, this.end_at);
if (is_circle) {
// Redefine end_draw in radius to create an accurate full circle
end_background = start_background + 2 * Math.PI;
ranged_value = to_radian(value);
} else {
// Range the value for the arc shape
ranged_value = to_radian(scale_arc_value(
start_at,
end_at,
value
));
}
double start_progress, end_progress;
if (inverted) {
start_progress = end_background - ranged_value;
end_progress = end_background;
} else {
start_progress = start_background;
end_progress = start_background + ranged_value;
}
// Draw background
cr.set_source_rgba(bg.red, bg.green, bg.blue, bg.alpha);
cr.arc(center_x, center_y, radius, start_background, end_background);
cr.set_line_width(bg_stroke);
cr.stroke();
// Draw rounded background ends
if (rounded) {
var start_x = center_x + Math.cos(start_background) * radius;
var start_y = center_y + Math.sin(start_background) * radius;
var end_x = center_x + Math.cos(end_background) * radius;
var end_y = center_y + Math.sin(end_background) * radius;
cr.set_line_width(0);
cr.arc(start_x, start_y, bg_stroke / 2, 0, 0 - 0.01);
cr.fill();
cr.arc(end_x, end_y, bg_stroke / 2, 0, 0 - 0.01);
cr.fill();
}
// Draw progress
cr.set_source_rgba(fg.red, fg.green, fg.blue, fg.alpha);
cr.arc(center_x, center_y, radius, start_progress, end_progress);
cr.set_line_width(fg_stroke);
cr.stroke();
// Draw rounded progress ends
if (rounded) {
var start_x = center_x + Math.cos(start_progress) * radius;
var start_y = center_y + Math.sin(start_progress) * radius;
var end_x = center_x + Math.cos(end_progress) * radius;
var end_y = center_y + Math.sin(end_progress) * radius;
cr.set_line_width(0);
cr.arc(start_x, start_y, fg_stroke / 2, 0, 0 - 0.01);
cr.fill();
cr.arc(end_x, end_y, fg_stroke / 2, 0, 0 - 0.01);
cr.fill();
}
if (get_child() != null) {
get_child().size_allocate(allocation);
propagate_draw(get_child(), cr);
}
return true;
}
}
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