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Improve dashed line alignment and make it optional.

This commit is contained in:
bruvzg 2023-01-13 10:30:12 +02:00
parent 7c2768c2f8
commit 9b2843f14f
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GPG Key ID: 7960FCF39844EC38
3 changed files with 16 additions and 9 deletions
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1
doc/classes/CanvasItem.xml
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@ -97,6 +97,7 @@
<param index="2" name="color" type="Color" />
<param index="3" name="width" type="float" default="1.0" />
<param index="4" name="dash" type="float" default="2.0" />
<param index="5" name="aligned" type="bool" default="true" />
<description>
Draws a dashed line from a 2D point to another, with a given color and width. See also [method draw_multiline] and [method draw_polyline].
</description>

22
scene/main/canvas_item.cpp
View File

@ -483,7 +483,7 @@ bool CanvasItem::is_y_sort_enabled() const {
return y_sort_enabled;
}
void CanvasItem::draw_dashed_line(const Point2 &p_from, const Point2 &p_to, const Color &p_color, real_t p_width, real_t p_dash) {
void CanvasItem::draw_dashed_line(const Point2 &p_from, const Point2 &p_to, const Color &p_color, real_t p_width, real_t p_dash, bool p_aligned) {
ERR_FAIL_COND_MSG(!drawing, "Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
float length = (p_to - p_from).length();
@ -492,14 +492,20 @@ void CanvasItem::draw_dashed_line(const Point2 &p_from, const Point2 &p_to, cons
return;
}
Point2 off = p_from;
Vector2 step = p_dash * (p_to - p_from).normalized();
int steps = length / p_dash / 2;
for (int i = 0; i < steps; i++) {
RenderingServer::get_singleton()->canvas_item_add_line(canvas_item, off, (off + step), p_color, p_width);
off += 2 * step;
int steps = (p_aligned) ? Math::ceil(length / p_dash) : Math::floor(length / p_dash);
if (steps % 2 == 0) {
steps--;
}
Point2 off = p_from;
if (p_aligned) {
off += (p_to - p_from).normalized() * (length - steps * p_dash) / 2.0;
}
for (int i = 0; i < steps; i += 2) {
RenderingServer::get_singleton()->canvas_item_add_line(canvas_item, (i == 0) ? p_from : off, (p_aligned && i == steps - 1) ? p_to : (off + step), p_color, p_width);
off += step * 2;
}
RenderingServer::get_singleton()->canvas_item_add_line(canvas_item, off, p_to, p_color, p_width);
}
void CanvasItem::draw_line(const Point2 &p_from, const Point2 &p_to, const Color &p_color, real_t p_width, bool p_antialiased) {
@ -963,7 +969,7 @@ void CanvasItem::_bind_methods() {
ClassDB::bind_method(D_METHOD("is_draw_behind_parent_enabled"), &CanvasItem::is_draw_behind_parent_enabled);
ClassDB::bind_method(D_METHOD("draw_line", "from", "to", "color", "width", "antialiased"), &CanvasItem::draw_line, DEFVAL(1.0), DEFVAL(false));
ClassDB::bind_method(D_METHOD("draw_dashed_line", "from", "to", "color", "width", "dash"), &CanvasItem::draw_dashed_line, DEFVAL(1.0), DEFVAL(2.0));
ClassDB::bind_method(D_METHOD("draw_dashed_line", "from", "to", "color", "width", "dash", "aligned"), &CanvasItem::draw_dashed_line, DEFVAL(1.0), DEFVAL(2.0), DEFVAL(true));
ClassDB::bind_method(D_METHOD("draw_polyline", "points", "color", "width", "antialiased"), &CanvasItem::draw_polyline, DEFVAL(1.0), DEFVAL(false));
ClassDB::bind_method(D_METHOD("draw_polyline_colors", "points", "colors", "width", "antialiased"), &CanvasItem::draw_polyline_colors, DEFVAL(1.0), DEFVAL(false));
ClassDB::bind_method(D_METHOD("draw_arc", "center", "radius", "start_angle", "end_angle", "point_count", "color", "width", "antialiased"), &CanvasItem::draw_arc, DEFVAL(1.0), DEFVAL(false));

2
scene/main/canvas_item.h
View File

@ -247,7 +247,7 @@ public:
/* DRAWING API */
void draw_dashed_line(const Point2 &p_from, const Point2 &p_to, const Color &p_color, real_t p_width = 1.0, real_t p_dash = 2.0);
void draw_dashed_line(const Point2 &p_from, const Point2 &p_to, const Color &p_color, real_t p_width = 1.0, real_t p_dash = 2.0, bool p_aligned = true);
void draw_line(const Point2 &p_from, const Point2 &p_to, const Color &p_color, real_t p_width = 1.0, bool p_antialiased = false);
void draw_polyline(const Vector<Point2> &p_points, const Color &p_color, real_t p_width = 1.0, bool p_antialiased = false);
void draw_polyline_colors(const Vector<Point2> &p_points, const Vector<Color> &p_colors, real_t p_width = 1.0, bool p_antialiased = false);