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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BKE_curves.hh"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_curve_primitive_circle_cc {
NODE_STORAGE_FUNCS(NodeGeometryCurvePrimitiveCircle)
static void node_declare(NodeDeclarationBuilder &b)
{
auto endable_points = [](bNode &node) {
node_storage(node).mode = GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_POINTS;
};
auto enable_radius = [](bNode &node) {
node_storage(node).mode = GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_RADIUS;
};
b.add_input<decl::Int>(N_("Resolution"))
.default_value(32)
.min(3)
.max(512)
.description(N_("Number of points on the circle"));
b.add_input<decl::Vector>(N_("Point 1"))
.default_value({-1.0f, 0.0f, 0.0f})
.subtype(PROP_TRANSLATION)
.description(
N_("One of the three points on the circle. The point order determines the circle's "
"direction"))
.make_available(endable_points);
b.add_input<decl::Vector>(N_("Point 2"))
.default_value({0.0f, 1.0f, 0.0f})
.subtype(PROP_TRANSLATION)
.description(
N_("One of the three points on the circle. The point order determines the circle's "
"direction"))
.make_available(endable_points);
b.add_input<decl::Vector>(N_("Point 3"))
.default_value({1.0f, 0.0f, 0.0f})
.subtype(PROP_TRANSLATION)
.description(
N_("One of the three points on the circle. The point order determines the circle's "
"direction"))
.make_available(endable_points);
b.add_input<decl::Float>(N_("Radius"))
.default_value(1.0f)
.min(0.0f)
.subtype(PROP_DISTANCE)
.description(N_("Distance of the points from the origin"))
.make_available(enable_radius);
b.add_output<decl::Geometry>(N_("Curve"));
b.add_output<decl::Vector>(N_("Center")).make_available(endable_points);
}
static void node_layout(uiLayout *layout, bContext *UNUSED(C), PointerRNA *ptr)
{
uiItemR(layout, ptr, "mode", UI_ITEM_R_EXPAND, nullptr, ICON_NONE);
}
static void node_init(bNodeTree *UNUSED(tree), bNode *node)
{
NodeGeometryCurvePrimitiveCircle *data = MEM_cnew<NodeGeometryCurvePrimitiveCircle>(__func__);
data->mode = GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_RADIUS;
node->storage = data;
}
static void node_update(bNodeTree *ntree, bNode *node)
{
const NodeGeometryCurvePrimitiveCircle &storage = node_storage(*node);
const GeometryNodeCurvePrimitiveCircleMode mode = (GeometryNodeCurvePrimitiveCircleMode)
storage.mode;
bNodeSocket *start_socket = static_cast<bNodeSocket *>(node->inputs.first)->next;
bNodeSocket *middle_socket = start_socket->next;
bNodeSocket *end_socket = middle_socket->next;
bNodeSocket *radius_socket = end_socket->next;
bNodeSocket *center_socket = static_cast<bNodeSocket *>(node->outputs.first)->next;
nodeSetSocketAvailability(
ntree, start_socket, mode == GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_POINTS);
nodeSetSocketAvailability(
ntree, middle_socket, mode == GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_POINTS);
nodeSetSocketAvailability(
ntree, end_socket, mode == GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_POINTS);
nodeSetSocketAvailability(
ntree, center_socket, mode == GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_POINTS);
nodeSetSocketAvailability(
ntree, radius_socket, mode == GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_RADIUS);
}
static bool colinear_f3_f3_f3(const float3 p1, const float3 p2, const float3 p3)
{
const float3 a = math::normalize(p2 - p1);
const float3 b = math::normalize(p3 - p1);
return ELEM(a, b, b * -1.0f);
}
static Curves *create_point_circle_curve(
const float3 p1, const float3 p2, const float3 p3, const int resolution, float3 &r_center)
{
if (colinear_f3_f3_f3(p1, p2, p3)) {
r_center = float3(0);
return nullptr;
}
Curves *curves_id = bke::curves_new_nomain_single(resolution, CURVE_TYPE_POLY);
bke::CurvesGeometry &curves = bke::CurvesGeometry::wrap(curves_id->geometry);
curves.cyclic_for_write().first() = true;
MutableSpan<float3> positions = curves.positions_for_write();
float3 center;
/* Midpoints of `P1->P2` and `P2->P3`. */
const float3 q1 = math::interpolate(p1, p2, 0.5f);
const float3 q2 = math::interpolate(p2, p3, 0.5f);
/* Normal Vectors of `P1->P2` and `P2->P3` */
const float3 v1 = math::normalize(p2 - p1);
const float3 v2 = math::normalize(p3 - p2);
/* Normal of plane of main 2 segments P1->P2 and `P2->P3`. */
const float3 v3 = math::normalize(math::cross(v1, v2));
/* Normal of plane of first perpendicular bisector and `P1->P2`. */
const float3 v4 = math::normalize(math::cross(v3, v1));
/* Determine Center-point from the intersection of 3 planes. */
float plane_1[4], plane_2[4], plane_3[4];
plane_from_point_normal_v3(plane_1, q1, v3);
plane_from_point_normal_v3(plane_2, q1, v1);
plane_from_point_normal_v3(plane_3, q2, v2);
/* If the 3 planes do not intersect at one point, just return empty geometry. */
if (!isect_plane_plane_plane_v3(plane_1, plane_2, plane_3, center)) {
r_center = float3(0);
return nullptr;
}
/* Get the radius from the center-point to p1. */
const float r = math::distance(p1, center);
const float theta_step = ((2 * M_PI) / float(resolution));
for (const int i : IndexRange(resolution)) {
/* Formula for a circle around a point and 2 unit vectors perpendicular
* to each other and the axis of the circle from:
* https://math.stackexchange.com/questions/73237/parametric-equation-of-a-circle-in-3d-space
*/
const float theta = theta_step * i;
positions[i] = center + r * sin(theta) * v1 + r * cos(theta) * v4;
}
r_center = center;
return curves_id;
}
static Curves *create_radius_circle_curve(const int resolution, const float radius)
{
Curves *curves_id = bke::curves_new_nomain_single(resolution, CURVE_TYPE_POLY);
bke::CurvesGeometry &curves = bke::CurvesGeometry::wrap(curves_id->geometry);
curves.cyclic_for_write().first() = true;
MutableSpan<float3> positions = curves.positions_for_write();
const float theta_step = (2.0f * M_PI) / float(resolution);
for (int i : IndexRange(resolution)) {
const float theta = theta_step * i;
const float x = radius * cos(theta);
const float y = radius * sin(theta);
positions[i] = float3(x, y, 0.0f);
}
return curves_id;
}
static void node_geo_exec(GeoNodeExecParams params)
{
const NodeGeometryCurvePrimitiveCircle &storage = node_storage(params.node());
const GeometryNodeCurvePrimitiveCircleMode mode = (GeometryNodeCurvePrimitiveCircleMode)
storage.mode;
Curves *curves = nullptr;
if (mode == GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_POINTS) {
float3 center_point;
curves = create_point_circle_curve(params.extract_input<float3>("Point 1"),
params.extract_input<float3>("Point 2"),
params.extract_input<float3>("Point 3"),
std::max(params.extract_input<int>("Resolution"), 3),
center_point);
params.set_output("Center", center_point);
}
else if (mode == GEO_NODE_CURVE_PRIMITIVE_CIRCLE_TYPE_RADIUS) {
curves = create_radius_circle_curve(std::max(params.extract_input<int>("Resolution"), 3),
params.extract_input<float>("Radius"));
}
if (curves) {
params.set_output("Curve", GeometrySet::create_with_curves(curves));
}
else {
params.set_default_remaining_outputs();
}
}
} // namespace blender::nodes::node_geo_curve_primitive_circle_cc
void register_node_type_geo_curve_primitive_circle()
{
namespace file_ns = blender::nodes::node_geo_curve_primitive_circle_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_CURVE_PRIMITIVE_CIRCLE, "Curve Circle", NODE_CLASS_GEOMETRY);
node_type_init(&ntype, file_ns::node_init);
node_type_update(&ntype, file_ns::node_update);
node_type_storage(&ntype,
"NodeGeometryCurvePrimitiveCircle",
node_free_standard_storage,
node_copy_standard_storage);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.draw_buttons = file_ns::node_layout;
nodeRegisterType(&ntype);
}
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