676 lines
23 KiB
C++
676 lines
23 KiB
C++
//-----------------------------------------------------------------------------
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// Draw a representation of an entity on-screen, in the case of curves up
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// to our chord tolerance, or return the distance from the user's mouse pointer
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// to the entity for selection.
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//
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// Copyright 2008-2013 Jonathan Westhues.
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//-----------------------------------------------------------------------------
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#include "solvespace.h"
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std::string Entity::DescriptionString() const {
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if(h.isFromRequest()) {
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Request *r = SK.GetRequest(h.request());
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return r->DescriptionString();
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} else {
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Group *g = SK.GetGroup(h.group());
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return g->DescriptionString();
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}
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}
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void Entity::GenerateEdges(SEdgeList *el) {
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SBezierList *sbl = GetOrGenerateBezierCurves();
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int i, j;
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for(i = 0; i < sbl->l.n; i++) {
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SBezier *sb = &(sbl->l.elem[i]);
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List<Vector> lv = {};
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sb->MakePwlInto(&lv);
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for(j = 1; j < lv.n; j++) {
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el->AddEdge(lv.elem[j-1], lv.elem[j], style.v, i);
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}
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lv.Clear();
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}
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}
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SBezierList *Entity::GetOrGenerateBezierCurves() {
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if(beziers.l.n == 0)
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GenerateBezierCurves(&beziers);
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return &beziers;
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}
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SEdgeList *Entity::GetOrGenerateEdges() {
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if(edges.l.n != 0) {
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if(EXACT(edgesChordTol == SS.ChordTolMm()))
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return &edges;
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edges.l.Clear();
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}
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if(edges.l.n == 0)
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GenerateEdges(&edges);
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edgesChordTol = SS.ChordTolMm();
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return &edges;
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}
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BBox Entity::GetOrGenerateScreenBBox(bool *hasBBox) {
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SBezierList *sbl = GetOrGenerateBezierCurves();
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// We don't bother with bounding boxes for workplanes, etc.
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*hasBBox = (IsPoint() || IsNormal() || sbl->l.n > 0);
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if(!*hasBBox) return {};
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if(screenBBoxValid)
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return screenBBox;
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if(IsPoint()) {
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Vector proj = SS.GW.ProjectPoint3(PointGetNum());
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screenBBox = BBox::From(proj, proj);
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} else if(IsNormal()) {
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Vector proj = SK.GetEntity(point[0])->PointGetNum();
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screenBBox = BBox::From(proj, proj);
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} else if(sbl->l.n > 0) {
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Vector first = SS.GW.ProjectPoint3(sbl->l.elem[0].ctrl[0]);
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screenBBox = BBox::From(first, first);
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for(int i = 0; i < sbl->l.n; i++) {
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SBezier *sb = &sbl->l.elem[i];
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for(int i = 0; i <= sb->deg; i++) {
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screenBBox.Include(SS.GW.ProjectPoint3(sb->ctrl[i]));
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}
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}
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} else ssassert(false, "Expected entity to be a point or have beziers");
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screenBBoxValid = true;
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return screenBBox;
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}
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void Entity::GetReferencePoints(std::vector<Vector> *refs) {
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switch(type) {
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case Type::POINT_N_COPY:
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case Type::POINT_N_TRANS:
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case Type::POINT_N_ROT_TRANS:
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case Type::POINT_N_ROT_AA:
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case Type::POINT_IN_3D:
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case Type::POINT_IN_2D:
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refs->push_back(PointGetNum());
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break;
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case Type::NORMAL_N_COPY:
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case Type::NORMAL_N_ROT:
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case Type::NORMAL_N_ROT_AA:
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case Type::NORMAL_IN_3D:
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case Type::NORMAL_IN_2D:
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case Type::WORKPLANE:
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case Type::CIRCLE:
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case Type::ARC_OF_CIRCLE:
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case Type::CUBIC:
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case Type::CUBIC_PERIODIC:
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case Type::TTF_TEXT:
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refs->push_back(SK.GetEntity(point[0])->PointGetNum());
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break;
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case Type::LINE_SEGMENT: {
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Vector a = SK.GetEntity(point[0])->PointGetNum(),
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b = SK.GetEntity(point[1])->PointGetNum();
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refs->push_back(b.Plus(a.Minus(b).ScaledBy(0.5)));
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break;
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}
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case Type::DISTANCE:
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case Type::DISTANCE_N_COPY:
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case Type::FACE_NORMAL_PT:
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case Type::FACE_XPROD:
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case Type::FACE_N_ROT_TRANS:
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case Type::FACE_N_TRANS:
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case Type::FACE_N_ROT_AA:
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break;
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}
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}
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int Entity::GetPositionOfPoint(const Camera &camera, Point2d p) {
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int position;
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ObjectPicker canvas = {};
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canvas.camera = camera;
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canvas.point = p;
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canvas.minDistance = 1e12;
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Draw(DrawAs::DEFAULT, &canvas);
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position = canvas.position;
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canvas.Clear();
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return position;
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}
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bool Entity::IsStylable() const {
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if(IsPoint()) return false;
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if(IsWorkplane()) return false;
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if(IsNormal()) return false;
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return true;
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}
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bool Entity::IsVisible() const {
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Group *g = SK.GetGroup(group);
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if(g->h.v == Group::HGROUP_REFERENCES.v && IsNormal()) {
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// The reference normals are always shown
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return true;
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}
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if(!(g->IsVisible())) return false;
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if(IsPoint() && !SS.GW.showPoints) return false;
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if(IsNormal() && !SS.GW.showNormals) return false;
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if(!SS.GW.showWorkplanes) {
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if(IsWorkplane() && !h.isFromRequest()) {
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if(g->h.v != SS.GW.activeGroup.v) {
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// The group-associated workplanes are hidden outside
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// their group.
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return false;
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}
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}
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}
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if(style.v) {
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Style *s = Style::Get(style);
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if(!s->visible) return false;
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}
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if(forceHidden) return false;
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return true;
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}
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void Entity::CalculateNumerical(bool forExport) {
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if(IsPoint()) actPoint = PointGetNum();
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if(IsNormal()) actNormal = NormalGetNum();
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if(type == Type::DISTANCE || type == Type::DISTANCE_N_COPY) {
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actDistance = DistanceGetNum();
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}
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if(IsFace()) {
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actPoint = FaceGetPointNum();
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Vector n = FaceGetNormalNum();
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actNormal = Quaternion::From(0, n.x, n.y, n.z);
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}
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if(forExport) {
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// Visibility in copied linked entities follows source file
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actVisible = IsVisible();
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} else {
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// Copied entities within a file are always visible
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actVisible = true;
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}
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}
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//-----------------------------------------------------------------------------
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// Compute a cubic, second derivative continuous, interpolating spline. Same
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// routine for periodic splines (in a loop) or open splines (with specified
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// end tangents).
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//-----------------------------------------------------------------------------
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void Entity::ComputeInterpolatingSpline(SBezierList *sbl, bool periodic) const {
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static const int MAX_N = BandedMatrix::MAX_UNKNOWNS;
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int ep = extraPoints;
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// The number of unknowns to solve for.
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int n = periodic ? 3 + ep : ep;
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ssassert(n < MAX_N, "Too many unknowns");
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// The number of on-curve points, one more than the number of segments.
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int pts = periodic ? 4 + ep : 2 + ep;
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int i, j, a;
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// The starting and finishing control points that define our end tangents
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// (if the spline isn't periodic), and the on-curve points.
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Vector ctrl_s = Vector::From(0, 0, 0);
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Vector ctrl_f = Vector::From(0, 0, 0);
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Vector pt[MAX_N+4];
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if(periodic) {
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for(i = 0; i < ep + 3; i++) {
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pt[i] = SK.GetEntity(point[i])->PointGetNum();
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}
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pt[i++] = SK.GetEntity(point[0])->PointGetNum();
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} else {
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ctrl_s = SK.GetEntity(point[1])->PointGetNum();
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ctrl_f = SK.GetEntity(point[ep+2])->PointGetNum();
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j = 0;
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pt[j++] = SK.GetEntity(point[0])->PointGetNum();
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for(i = 2; i <= ep + 1; i++) {
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pt[j++] = SK.GetEntity(point[i])->PointGetNum();
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}
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pt[j++] = SK.GetEntity(point[ep+3])->PointGetNum();
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}
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// The unknowns that we will be solving for, a set for each coordinate.
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double Xx[MAX_N], Xy[MAX_N], Xz[MAX_N];
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// For a cubic Bezier section f(t) as t goes from 0 to 1,
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// f' (0) = 3*(P1 - P0)
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// f' (1) = 3*(P3 - P2)
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// f''(0) = 6*(P0 - 2*P1 + P2)
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// f''(1) = 6*(P3 - 2*P2 + P1)
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for(a = 0; a < 3; a++) {
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BandedMatrix bm = {};
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bm.n = n;
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for(i = 0; i < n; i++) {
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int im, it, ip;
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if(periodic) {
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im = WRAP(i - 1, n);
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it = i;
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ip = WRAP(i + 1, n);
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} else {
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im = i;
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it = i + 1;
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ip = i + 2;
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}
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// All of these are expressed in terms of a constant part, and
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// of X[i-1], X[i], and X[i+1]; so let these be the four
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// components of that vector;
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Vector4 A, B, C, D, E;
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// The on-curve interpolated point
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C = Vector4::From((pt[it]).Element(a), 0, 0, 0);
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// control point one back, C - X[i]
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B = C.Plus(Vector4::From(0, 0, -1, 0));
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// control point one forward, C + X[i]
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D = C.Plus(Vector4::From(0, 0, 1, 0));
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// control point two back
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if(i == 0 && !periodic) {
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A = Vector4::From(ctrl_s.Element(a), 0, 0, 0);
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} else {
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// pt[im] + X[i-1]
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A = Vector4::From(pt[im].Element(a), 1, 0, 0);
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}
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// control point two forward
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if(i == (n - 1) && !periodic) {
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E = Vector4::From(ctrl_f.Element(a), 0, 0, 0);
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} else {
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// pt[ip] - X[i+1]
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E = Vector4::From((pt[ip]).Element(a), 0, 0, -1);
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}
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// Write the second derivatives of each segment, dropping constant
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Vector4 fprev_pp = (C.Minus(B.ScaledBy(2))).Plus(A),
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fnext_pp = (C.Minus(D.ScaledBy(2))).Plus(E),
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eq = fprev_pp.Minus(fnext_pp);
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bm.B[i] = -eq.w;
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if(periodic) {
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bm.A[i][WRAP(i-2, n)] = eq.x;
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bm.A[i][WRAP(i-1, n)] = eq.y;
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bm.A[i][i] = eq.z;
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} else {
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// The wrapping would work, except when n = 1 and everything
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// wraps to zero...
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if(i > 0) bm.A[i][i - 1] = eq.x;
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bm.A[i][i] = eq.y;
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if(i < (n-1)) bm.A[i][i + 1] = eq.z;
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}
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}
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bm.Solve();
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double *X = (a == 0) ? Xx :
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(a == 1) ? Xy :
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Xz;
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memcpy(X, bm.X, n*sizeof(double));
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}
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for(i = 0; i < pts - 1; i++) {
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Vector p0, p1, p2, p3;
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if(periodic) {
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p0 = pt[i];
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int iw = WRAP(i - 1, n);
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p1 = p0.Plus(Vector::From(Xx[iw], Xy[iw], Xz[iw]));
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} else if(i == 0) {
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p0 = pt[0];
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p1 = ctrl_s;
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} else {
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p0 = pt[i];
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p1 = p0.Plus(Vector::From(Xx[i-1], Xy[i-1], Xz[i-1]));
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}
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if(periodic) {
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p3 = pt[i+1];
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int iw = WRAP(i, n);
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p2 = p3.Minus(Vector::From(Xx[iw], Xy[iw], Xz[iw]));
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} else if(i == (pts - 2)) {
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p3 = pt[pts-1];
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p2 = ctrl_f;
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} else {
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p3 = pt[i+1];
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p2 = p3.Minus(Vector::From(Xx[i], Xy[i], Xz[i]));
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}
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SBezier sb = SBezier::From(p0, p1, p2, p3);
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sbl->l.Add(&sb);
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}
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}
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void Entity::GenerateBezierCurves(SBezierList *sbl) const {
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SBezier sb;
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int i = sbl->l.n;
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switch(type) {
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case Type::LINE_SEGMENT: {
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Vector a = SK.GetEntity(point[0])->PointGetNum();
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Vector b = SK.GetEntity(point[1])->PointGetNum();
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sb = SBezier::From(a, b);
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sb.entity = h.v;
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sbl->l.Add(&sb);
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break;
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}
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case Type::CUBIC:
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ComputeInterpolatingSpline(sbl, /*periodic=*/false);
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break;
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case Type::CUBIC_PERIODIC:
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ComputeInterpolatingSpline(sbl, /*periodic=*/true);
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break;
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case Type::CIRCLE:
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case Type::ARC_OF_CIRCLE: {
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Vector center = SK.GetEntity(point[0])->PointGetNum();
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Quaternion q = SK.GetEntity(normal)->NormalGetNum();
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Vector u = q.RotationU(), v = q.RotationV();
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double r = CircleGetRadiusNum();
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double thetaa, thetab, dtheta;
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if(r < LENGTH_EPS) {
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// If a circle or an arc gets dragged through zero radius,
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// then we just don't generate anything.
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break;
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}
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if(type == Type::CIRCLE) {
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thetaa = 0;
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thetab = 2*PI;
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dtheta = 2*PI;
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} else {
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ArcGetAngles(&thetaa, &thetab, &dtheta);
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}
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int i, n;
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if(dtheta > (3*PI/2 + 0.01)) {
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n = 4;
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} else if(dtheta > (PI + 0.01)) {
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n = 3;
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} else if(dtheta > (PI/2 + 0.01)) {
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n = 2;
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} else {
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n = 1;
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}
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dtheta /= n;
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for(i = 0; i < n; i++) {
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double s, c;
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c = cos(thetaa);
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s = sin(thetaa);
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// The start point of the curve, and the tangent vector at
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// that start point.
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Vector p0 = center.Plus(u.ScaledBy( r*c)).Plus(v.ScaledBy(r*s)),
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t0 = u.ScaledBy(-r*s). Plus(v.ScaledBy(r*c));
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thetaa += dtheta;
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c = cos(thetaa);
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s = sin(thetaa);
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Vector p2 = center.Plus(u.ScaledBy( r*c)).Plus(v.ScaledBy(r*s)),
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t2 = u.ScaledBy(-r*s). Plus(v.ScaledBy(r*c));
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// The control point must lie on both tangents.
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Vector p1 = Vector::AtIntersectionOfLines(p0, p0.Plus(t0),
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p2, p2.Plus(t2),
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NULL);
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SBezier sb = SBezier::From(p0, p1, p2);
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sb.weight[1] = cos(dtheta/2);
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sbl->l.Add(&sb);
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}
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break;
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}
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case Type::TTF_TEXT: {
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Vector topLeft = SK.GetEntity(point[0])->PointGetNum();
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Vector botLeft = SK.GetEntity(point[1])->PointGetNum();
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Vector n = Normal()->NormalN();
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Vector v = topLeft.Minus(botLeft);
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Vector u = (v.Cross(n)).WithMagnitude(v.Magnitude());
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SS.fonts.PlotString(font, str, sbl, botLeft, u, v);
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break;
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}
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default:
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// Not a problem, points and normals and such don't generate curves
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break;
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}
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// Record our style for all of the Beziers that we just created.
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for(; i < sbl->l.n; i++) {
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sbl->l.elem[i].auxA = style.v;
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}
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}
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void Entity::Draw(DrawAs how, Canvas *canvas) {
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if(!IsVisible()) return;
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int zIndex;
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if(how == DrawAs::HIDDEN) {
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zIndex = 2;
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} else if(group.v != SS.GW.activeGroup.v) {
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zIndex = 3;
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} else {
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zIndex = 4;
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}
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hStyle hs;
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if(IsPoint()) {
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hs.v = Style::DATUM;
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} else if(IsNormal() || type == Type::WORKPLANE) {
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hs.v = Style::NORMALS;
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} else {
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hs = Style::ForEntity(h);
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}
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Canvas::Stroke stroke = Style::Stroke(hs);
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switch(how) {
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case DrawAs::DEFAULT:
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stroke.layer = Canvas::Layer::NORMAL;
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break;
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case DrawAs::OVERLAY:
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stroke.layer = Canvas::Layer::FRONT;
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break;
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case DrawAs::HIDDEN:
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stroke.layer = Canvas::Layer::OCCLUDED;
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stroke.stipplePattern = Style::PatternType({ Style::HIDDEN_EDGE });
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stroke.stippleScale = Style::Get({ Style::HIDDEN_EDGE })->stippleScale;
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break;
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case DrawAs::HOVERED:
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stroke.layer = Canvas::Layer::FRONT;
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stroke.color = Style::Color(Style::HOVERED);
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break;
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case DrawAs::SELECTED:
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stroke.layer = Canvas::Layer::FRONT;
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stroke.color = Style::Color(Style::SELECTED);
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break;
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}
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stroke.zIndex = zIndex;
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Canvas::hStroke hcs = canvas->GetStroke(stroke);
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Canvas::Stroke pointStroke = {};
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pointStroke.layer = stroke.layer;
|
|
pointStroke.zIndex = IsPoint() ? zIndex + 1 : 0;
|
|
pointStroke.color = stroke.color;
|
|
pointStroke.width = 7.0;
|
|
pointStroke.unit = Canvas::Unit::PX;
|
|
Canvas::hStroke hcsPoint = canvas->GetStroke(pointStroke);
|
|
|
|
switch(type) {
|
|
case Type::POINT_N_COPY:
|
|
case Type::POINT_N_TRANS:
|
|
case Type::POINT_N_ROT_TRANS:
|
|
case Type::POINT_N_ROT_AA:
|
|
case Type::POINT_IN_3D:
|
|
case Type::POINT_IN_2D: {
|
|
if(how == DrawAs::HIDDEN) return;
|
|
|
|
// If we're analyzing the sketch to show the degrees of freedom,
|
|
// then we draw big colored squares over the points that are
|
|
// free to move.
|
|
bool free = false;
|
|
if(type == Type::POINT_IN_3D) {
|
|
Param *px = SK.GetParam(param[0]),
|
|
*py = SK.GetParam(param[1]),
|
|
*pz = SK.GetParam(param[2]);
|
|
|
|
free = px->free || py->free || pz->free;
|
|
} else if(type == Type::POINT_IN_2D) {
|
|
Param *pu = SK.GetParam(param[0]),
|
|
*pv = SK.GetParam(param[1]);
|
|
|
|
free = pu->free || pv->free;
|
|
}
|
|
if(free) {
|
|
Canvas::Stroke analyzeStroke = Style::Stroke(Style::ANALYZE);
|
|
analyzeStroke.width = 14.0;
|
|
Canvas::hStroke hcsAnalyze = canvas->GetStroke(analyzeStroke);
|
|
|
|
canvas->DrawPoint(PointGetNum(), hcsAnalyze);
|
|
}
|
|
|
|
canvas->DrawPoint(PointGetNum(), hcsPoint);
|
|
return;
|
|
}
|
|
|
|
case Type::NORMAL_N_COPY:
|
|
case Type::NORMAL_N_ROT:
|
|
case Type::NORMAL_N_ROT_AA:
|
|
case Type::NORMAL_IN_3D:
|
|
case Type::NORMAL_IN_2D: {
|
|
const Camera &camera = canvas->GetCamera();
|
|
|
|
if(how == DrawAs::HIDDEN) return;
|
|
|
|
for(int i = 0; i < 2; i++) {
|
|
bool asReference = (i == 1);
|
|
if(asReference) {
|
|
if(!h.request().IsFromReferences()) continue;
|
|
} else {
|
|
if(!SK.GetGroup(group)->IsVisible() || !SS.GW.showNormals) continue;
|
|
}
|
|
|
|
stroke.layer = (asReference) ? Canvas::Layer::FRONT : Canvas::Layer::NORMAL;
|
|
if(how != DrawAs::HOVERED && how != DrawAs::SELECTED) {
|
|
// Always draw the x, y, and z axes in red, green, and blue;
|
|
// brighter for the ones at the bottom left of the screen,
|
|
// dimmer for the ones at the model origin.
|
|
hRequest hr = h.request();
|
|
uint8_t luma = (asReference) ? 255 : 100;
|
|
if(hr.v == Request::HREQUEST_REFERENCE_XY.v) {
|
|
stroke.color = RgbaColor::From(0, 0, luma);
|
|
} else if(hr.v == Request::HREQUEST_REFERENCE_YZ.v) {
|
|
stroke.color = RgbaColor::From(luma, 0, 0);
|
|
} else if(hr.v == Request::HREQUEST_REFERENCE_ZX.v) {
|
|
stroke.color = RgbaColor::From(0, luma, 0);
|
|
}
|
|
}
|
|
|
|
Quaternion q = NormalGetNum();
|
|
Vector tail;
|
|
if(asReference) {
|
|
// Draw an extra copy of the x, y, and z axes, that's
|
|
// always in the corner of the view and at the front.
|
|
// So those are always available, perhaps useful.
|
|
stroke.width = 2;
|
|
double s = camera.scale;
|
|
double h = 60 - camera.height / 2.0;
|
|
double w = 60 - camera.width / 2.0;
|
|
tail = camera.projRight.ScaledBy(w/s).Plus(
|
|
camera.projUp. ScaledBy(h/s)).Minus(camera.offset);
|
|
} else {
|
|
tail = SK.GetEntity(point[0])->PointGetNum();
|
|
}
|
|
tail = camera.AlignToPixelGrid(tail);
|
|
|
|
hcs = canvas->GetStroke(stroke);
|
|
Vector v = (q.RotationN()).WithMagnitude(50.0 / camera.scale);
|
|
Vector tip = tail.Plus(v);
|
|
canvas->DrawLine(tail, tip, hcs);
|
|
|
|
v = v.WithMagnitude(12.0 / camera.scale);
|
|
Vector axis = q.RotationV();
|
|
canvas->DrawLine(tip, tip.Minus(v.RotatedAbout(axis, 0.6)), hcs);
|
|
canvas->DrawLine(tip, tip.Minus(v.RotatedAbout(axis, -0.6)), hcs);
|
|
}
|
|
return;
|
|
}
|
|
|
|
case Type::DISTANCE:
|
|
case Type::DISTANCE_N_COPY:
|
|
// These are used only as data structures, nothing to display.
|
|
return;
|
|
|
|
case Type::WORKPLANE: {
|
|
const Camera &camera = canvas->GetCamera();
|
|
|
|
Vector p = SK.GetEntity(point[0])->PointGetNum();
|
|
p = camera.AlignToPixelGrid(p);
|
|
|
|
Vector u = Normal()->NormalU();
|
|
Vector v = Normal()->NormalV();
|
|
|
|
double s = (std::min(camera.width, camera.height)) * 0.45 / camera.scale;
|
|
|
|
Vector us = u.ScaledBy(s);
|
|
Vector vs = v.ScaledBy(s);
|
|
|
|
Vector pp = p.Plus (us).Plus (vs);
|
|
Vector pm = p.Plus (us).Minus(vs);
|
|
Vector mm = p.Minus(us).Minus(vs), mm2 = mm;
|
|
Vector mp = p.Minus(us).Plus (vs);
|
|
|
|
Canvas::Stroke strokeBorder = stroke;
|
|
strokeBorder.zIndex -= 3;
|
|
strokeBorder.stipplePattern = StipplePattern::SHORT_DASH;
|
|
strokeBorder.stippleScale = 8.0;
|
|
Canvas::hStroke hcsBorder = canvas->GetStroke(strokeBorder);
|
|
|
|
double textHeight = Style::TextHeight(hs) / camera.scale;
|
|
|
|
if(!h.isFromRequest()) {
|
|
mm = mm.Plus(v.ScaledBy(textHeight * 4.7));
|
|
mm2 = mm2.Plus(u.ScaledBy(textHeight * 4.7));
|
|
canvas->DrawLine(mm2, mm, hcsBorder);
|
|
}
|
|
canvas->DrawLine(pp, pm, hcsBorder);
|
|
canvas->DrawLine(mm2, pm, hcsBorder);
|
|
canvas->DrawLine(mm, mp, hcsBorder);
|
|
canvas->DrawLine(pp, mp, hcsBorder);
|
|
|
|
Vector o = mm2.Plus(u.ScaledBy(3.0 / camera.scale)).Plus(
|
|
v.ScaledBy(3.0 / camera.scale));
|
|
std::string shortDesc = DescriptionString().substr(5);
|
|
canvas->DrawVectorText(shortDesc, textHeight, o, u, v, hcs);
|
|
return;
|
|
}
|
|
|
|
case Type::LINE_SEGMENT:
|
|
case Type::CIRCLE:
|
|
case Type::ARC_OF_CIRCLE:
|
|
case Type::CUBIC:
|
|
case Type::CUBIC_PERIODIC:
|
|
case Type::TTF_TEXT: {
|
|
// Generate the rational polynomial curves, then piecewise linearize
|
|
// them, and display those.
|
|
if(!canvas->DrawBeziers(*GetOrGenerateBezierCurves(), hcs)) {
|
|
canvas->DrawEdges(*GetOrGenerateEdges(), hcs);
|
|
}
|
|
return;
|
|
}
|
|
|
|
case Type::FACE_NORMAL_PT:
|
|
case Type::FACE_XPROD:
|
|
case Type::FACE_N_ROT_TRANS:
|
|
case Type::FACE_N_TRANS:
|
|
case Type::FACE_N_ROT_AA:
|
|
// Do nothing; these are drawn with the triangle mesh
|
|
return;
|
|
}
|
|
ssassert(false, "Unexpected entity type");
|
|
}
|