534 lines
20 KiB
C++
534 lines
20 KiB
C++
#include "solvespace.h"
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bool Constraint::HasLabel(void) {
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switch(type) {
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case PT_LINE_DISTANCE:
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case PT_PLANE_DISTANCE:
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case PT_PT_DISTANCE:
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case DIAMETER:
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case LENGTH_RATIO:
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case ANGLE:
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return true;
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default:
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return false;
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}
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}
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void Constraint::LineDrawOrGetDistance(Vector a, Vector b) {
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if(dogd.drawing) {
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glBegin(GL_LINE_STRIP);
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glxVertex3v(a);
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glxVertex3v(b);
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glEnd();
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} else {
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Point2d ap = SS.GW.ProjectPoint(a);
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Point2d bp = SS.GW.ProjectPoint(b);
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double d = dogd.mp.DistanceToLine(ap, bp.Minus(ap), true);
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dogd.dmin = min(dogd.dmin, d);
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}
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dogd.refp = (a.Plus(b)).ScaledBy(0.5);
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}
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double Constraint::EllipticalInterpolation(double rx, double ry, double theta) {
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double ex = rx*cos(theta);
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double ey = ry*sin(theta);
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double v = sqrt(ex*ex + ey*ey);
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return v;
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}
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void Constraint::DoLabel(Vector ref, Vector *labelPos, Vector gr, Vector gu) {
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char *s = exprA->Print();
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if(labelPos) {
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// labelPos is from the top left corner (for the text box used to
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// edit things), but ref is from the center.
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*labelPos = ref.Minus(gr.WithMagnitude(glxStrWidth(s)/2)).Minus(
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gu.WithMagnitude(glxStrHeight()/2));
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}
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if(dogd.drawing) {
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glPushMatrix();
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glxTranslatev(ref);
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glxOntoWorkplane(gr, gu);
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glxWriteTextRefCenter(s);
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glPopMatrix();
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} else {
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Point2d o = SS.GW.ProjectPoint(ref);
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dogd.dmin = min(dogd.dmin, o.DistanceTo(dogd.mp) - 10);
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dogd.refp = ref;
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}
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}
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void Constraint::DoProjectedPoint(Vector *r) {
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Vector p = r->ProjectInto(workplane);
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glLineStipple(4, 0x5555);
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glEnable(GL_LINE_STIPPLE);
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LineDrawOrGetDistance(p, *r);
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glDisable(GL_LINE_STIPPLE);
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*r = p;
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}
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void Constraint::DrawOrGetDistance(Vector *labelPos) {
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if(!SS.GW.showConstraints) return;
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Group *g = SS.GetGroup(group);
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// If the group is hidden, then the constraints are hidden and not
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// able to be selected.
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if(!(g->visible)) return;
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// And likewise if the group is not the active group.
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if(g->h.v != SS.GW.activeGroup.v) return;
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// Unit vectors that describe our current view of the scene. One pixel
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// long, not one actual unit.
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Vector gr = SS.GW.projRight.ScaledBy(1/SS.GW.scale);
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Vector gu = SS.GW.projUp.ScaledBy(1/SS.GW.scale);
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Vector gn = (gr.Cross(gu)).WithMagnitude(1/SS.GW.scale);
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glxColor3d(1, 0.1, 1);
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switch(type) {
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case PT_PT_DISTANCE: {
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Vector ap = SS.GetEntity(ptA)->PointGetNum();
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Vector bp = SS.GetEntity(ptB)->PointGetNum();
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if(workplane.v != Entity::FREE_IN_3D.v) {
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DoProjectedPoint(&ap);
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DoProjectedPoint(&bp);
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}
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Vector ref = ((ap.Plus(bp)).ScaledBy(0.5)).Plus(disp.offset);
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Vector ab = ap.Minus(bp);
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Vector ar = ap.Minus(ref);
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// Normal to a plan containing the line and the label origin.
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Vector n = ab.Cross(ar);
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Vector out = ab.Cross(n).WithMagnitude(1);
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out = out.ScaledBy(-out.Dot(ar));
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LineDrawOrGetDistance(ap, ap.Plus(out));
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LineDrawOrGetDistance(bp, bp.Plus(out));
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DoLabel(ref, labelPos, gr, gu);
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break;
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}
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case PT_PLANE_DISTANCE: {
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Vector pt = SS.GetEntity(ptA)->PointGetNum();
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Entity *plane = SS.GetEntity(entityA);
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Vector n = plane->Normal()->NormalN();
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Vector p = plane->WorkplaneGetOffset();
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double d = (p.Minus(pt)).Dot(n);
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Vector closest = pt.Plus(n.WithMagnitude(d));
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LineDrawOrGetDistance(pt, closest);
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Vector ref = ((closest.Plus(pt)).ScaledBy(0.5)).Plus(disp.offset);
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DoLabel(ref, labelPos, gr, gu);
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break;
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}
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case PT_LINE_DISTANCE: {
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Vector pt = SS.GetEntity(ptA)->PointGetNum();
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Entity *line = SS.GetEntity(entityA);
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Vector lA = SS.GetEntity(line->point[0])->PointGetNum();
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Vector lB = SS.GetEntity(line->point[1])->PointGetNum();
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if(workplane.v != Entity::FREE_IN_3D.v) {
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lA = lA.ProjectInto(workplane);
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lB = lB.ProjectInto(workplane);
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DoProjectedPoint(&pt);
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}
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Vector lAB = (lA.Minus(lB)).WithMagnitude(1);
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Vector closest;
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// lA, lB, and pt define a plane; the min distance is in
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// that plane, so calculate its normal
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Vector pn = (pt.Minus(lA)).Cross(lAB);
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// The minimum distance line is in that plane, perpendicular
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// to the line
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Vector n = pn.Cross(lAB);
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// Calculate the actual distance
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double d = (lAB.Cross(lA.Minus(pt))).Magnitude();
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closest = pt.Plus(n.WithMagnitude(d));
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LineDrawOrGetDistance(pt, closest);
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Vector ref = ((closest.Plus(pt)).ScaledBy(0.5)).Plus(disp.offset);
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DoLabel(ref, labelPos, gr, gu);
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if(workplane.v != Entity::FREE_IN_3D.v) {
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// Draw the projection marker from the closest point on the
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// projected line to the projected point on the real line.
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lAB = (lA.Minus(lB));
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double t = (lA.Minus(closest)).DivPivoting(lAB);
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Vector lA = SS.GetEntity(line->point[0])->PointGetNum();
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Vector lB = SS.GetEntity(line->point[1])->PointGetNum();
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Vector c2 = (lA.ScaledBy(1-t)).Plus(lB.ScaledBy(t));
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DoProjectedPoint(&c2);
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}
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break;
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}
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case DIAMETER: {
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Entity *circle = SS.GetEntity(entityA);
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Vector center = SS.GetEntity(circle->point[0])->PointGetNum();
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double r = circle->CircleGetRadiusNum();
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Vector ref = center.Plus(disp.offset);
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double theta = atan2(disp.offset.Dot(gu), disp.offset.Dot(gr));
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double adj = EllipticalInterpolation(
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glxStrWidth(exprA->Print())/2, glxStrHeight()/2, theta);
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Vector mark = ref.Minus(center);
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mark = mark.WithMagnitude(mark.Magnitude()-r);
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LineDrawOrGetDistance(ref.Minus(mark.WithMagnitude(adj)),
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ref.Minus(mark));
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DoLabel(ref, labelPos, gr, gu);
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break;
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}
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case POINTS_COINCIDENT: {
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if(!dogd.drawing) {
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for(int i = 0; i < 2; i++) {
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Vector p = SS.GetEntity(i == 0 ? ptA : ptB)-> PointGetNum();
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Point2d pp = SS.GW.ProjectPoint(p);
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// The point is selected within a radius of 7, from the
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// same center; so if the point is visible, then this
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// constraint cannot be selected. But that's okay.
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dogd.dmin = min(dogd.dmin, pp.DistanceTo(dogd.mp) - 3);
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dogd.refp = p;
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}
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break;
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}
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for(int a = 0; a < 2; a++) {
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Vector r = SS.GW.projRight.ScaledBy((a+1)/SS.GW.scale);
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Vector d = SS.GW.projUp.ScaledBy((2-a)/SS.GW.scale);
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for(int i = 0; i < 2; i++) {
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Vector p = SS.GetEntity(i == 0 ? ptA : ptB)-> PointGetNum();
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glxColor3d(0.4, 0, 0.4);
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glBegin(GL_QUADS);
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glxVertex3v(p.Plus (r).Plus (d));
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glxVertex3v(p.Plus (r).Minus(d));
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glxVertex3v(p.Minus(r).Minus(d));
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glxVertex3v(p.Minus(r).Plus (d));
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glEnd();
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}
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}
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break;
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}
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case PT_ON_CIRCLE:
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case PT_ON_LINE:
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case PT_IN_PLANE: {
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double s = 7/SS.GW.scale;
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Vector p = SS.GetEntity(ptA)->PointGetNum();
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Vector r = gr.WithMagnitude(s);
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Vector d = gu.WithMagnitude(s);
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LineDrawOrGetDistance(p.Plus (r).Plus (d), p.Plus (r).Minus(d));
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LineDrawOrGetDistance(p.Plus (r).Minus(d), p.Minus(r).Minus(d));
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LineDrawOrGetDistance(p.Minus(r).Minus(d), p.Minus(r).Plus (d));
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LineDrawOrGetDistance(p.Minus(r).Plus (d), p.Plus (r).Plus (d));
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break;
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}
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case SAME_ORIENTATION: {
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for(int i = 0; i < 2; i++) {
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Entity *e = SS.GetEntity(i == 0 ? entityA : entityB);
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Quaternion q = e->NormalGetNum();
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Vector n = q.RotationN().WithMagnitude(25/SS.GW.scale);
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Vector u = q.RotationU().WithMagnitude(6/SS.GW.scale);
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Vector p = SS.GetEntity(e->point[0])->PointGetNum();
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p = p.Plus(n.WithMagnitude(10/SS.GW.scale));
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LineDrawOrGetDistance(p.Plus(u), p.Minus(u).Plus(n));
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LineDrawOrGetDistance(p.Minus(u), p.Plus(u).Plus(n));
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}
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break;
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}
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case ANGLE: {
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Entity *a = SS.GetEntity(entityA);
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Entity *b = SS.GetEntity(entityB);
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Vector a0 = a->VectorGetRefPoint();
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Vector b0 = b->VectorGetRefPoint();
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Vector da = a->VectorGetNum();
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Vector db = b->VectorGetNum();
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if(otherAngle) da = da.ScaledBy(-1);
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if(workplane.v != Entity::FREE_IN_3D.v) {
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a0 = a0.ProjectInto(workplane);
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b0 = b0.ProjectInto(workplane);
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da = da.ProjectVectorInto(workplane);
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db = db.ProjectVectorInto(workplane);
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}
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// Make an orthogonal coordinate system from those directions
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Vector dn = da.Cross(db); // normal to both
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Vector dna = dn.Cross(da); // normal to da
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Vector dnb = dn.Cross(db); // normal to db
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// At the intersection of the lines
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// a0 + pa*da = b0 + pb*db (where pa, pb are scalar params)
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// So dot this equation against dna and dnb to get two equations
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// to solve for da and db
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double pb = ((a0.Minus(b0)).Dot(dna))/(db.Dot(dna));
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double pa = -((a0.Minus(b0)).Dot(dnb))/(da.Dot(dnb));
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Vector pi = a0.Plus(da.ScaledBy(pa));
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Vector ref;
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if(pi.Equals(b0.Plus(db.ScaledBy(pb)))) {
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ref = pi.Plus(disp.offset);
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// We draw in a coordinate system centered at pi, with
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// basis vectors da and dna.
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da = da.WithMagnitude(1); dna = dna.WithMagnitude(1);
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Vector rm = ref.Minus(pi);
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double rda = rm.Dot(da), rdna = rm.Dot(dna);
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double r = sqrt(rda*rda + rdna*rdna);
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double c = (da.Dot(db))/(da.Magnitude()*db.Magnitude());
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double thetaf = acos(c);
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Vector m = da.ScaledBy(cos(thetaf/2)).Plus(
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dna.ScaledBy(sin(thetaf/2)));
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if(m.Dot(rm) < 0) {
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da = da.ScaledBy(-1); dna = dna.ScaledBy(-1);
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}
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Vector prev = da.ScaledBy(r).Plus(pi);
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int i, n = 30;
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for(i = 0; i <= n; i++) {
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double theta = (i*thetaf)/n;
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Vector p = da. ScaledBy(r*cos(theta)).Plus(
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dna.ScaledBy(r*sin(theta))).Plus(pi);
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LineDrawOrGetDistance(prev, p);
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prev = p;
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}
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double tl = atan2(rm.Dot(gu), rm.Dot(gr));
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double adj = EllipticalInterpolation(
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glxStrWidth(exprA->Print())/2, glxStrHeight()/2, tl);
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ref = ref.Plus(rm.WithMagnitude(adj + 3/SS.GW.scale));
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} else {
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// The lines are skew; no wonderful way to illustrate that.
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ref = a->VectorGetRefPoint().Plus(b->VectorGetRefPoint());
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ref = ref.ScaledBy(0.5).Plus(disp.offset);
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glPushMatrix();
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gu = gu.WithMagnitude(1);
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glxTranslatev(ref.Plus(gu.ScaledBy(-1.5*glxStrHeight())));
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glxOntoWorkplane(gr, gu);
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glxWriteTextRefCenter("angle between skew lines");
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glPopMatrix();
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}
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DoLabel(ref, labelPos, gr, gu);
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break;
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}
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case PARALLEL: {
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for(int i = 0; i < 2; i++) {
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Entity *e = SS.GetEntity(i == 0 ? entityA : entityB);
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Vector n = e->VectorGetNum();
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n = n.WithMagnitude(25/SS.GW.scale);
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Vector u = (gn.Cross(n)).WithMagnitude(4/SS.GW.scale);
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Vector p = e->VectorGetRefPoint();
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LineDrawOrGetDistance(p.Plus(u), p.Plus(u).Plus(n));
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LineDrawOrGetDistance(p.Minus(u), p.Minus(u).Plus(n));
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}
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break;
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}
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case EQUAL_RADIUS: {
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for(int i = 0; i < 2; i++) {
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Entity *circ = SS.GetEntity(i == 0 ? entityA : entityB);
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Vector center = SS.GetEntity(circ->point[0])->PointGetNum();
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double r = circ->CircleGetRadiusNum();
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Quaternion q = circ->Normal()->NormalGetNum();
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Vector u = q.RotationU(), v = q.RotationV();
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double theta;
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if(circ->type == Entity::CIRCLE) {
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theta = PI/2;
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} else if(circ->type == Entity::ARC_OF_CIRCLE) {
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double thetaa, thetab, dtheta;
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circ->ArcGetAngles(&thetaa, &thetab, &dtheta);
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theta = thetaa + dtheta/2;
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} else oops();
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Vector d = u.ScaledBy(cos(theta)).Plus(v.ScaledBy(sin(theta)));
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d = d.ScaledBy(r);
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Vector p = center.Plus(d);
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Vector tick = d.WithMagnitude(10/SS.GW.scale);
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LineDrawOrGetDistance(p.Plus(tick), p.Minus(tick));
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}
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break;
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}
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case LENGTH_RATIO:
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case EQUAL_LENGTH_LINES: {
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Vector a, b;
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for(int i = 0; i < 2; i++) {
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Entity *e = SS.GetEntity(i == 0 ? entityA : entityB);
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a = SS.GetEntity(e->point[0])->PointGetNum();
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b = SS.GetEntity(e->point[1])->PointGetNum();
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Vector m = (a.ScaledBy(1.0/3)).Plus(b.ScaledBy(2.0/3));
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Vector ab = a.Minus(b);
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Vector n = (gn.Cross(ab)).WithMagnitude(10/SS.GW.scale);
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LineDrawOrGetDistance(m.Minus(n), m.Plus(n));
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}
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if(type == LENGTH_RATIO) {
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Vector ref = ((a.Plus(b)).ScaledBy(0.5)).Plus(disp.offset);
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DoLabel(ref, labelPos, gr, gu);
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}
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break;
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}
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{
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Vector n;
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case SYMMETRIC:
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n = SS.GetEntity(entityA)->Normal()->NormalN(); goto s;
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case SYMMETRIC_HORIZ:
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n = SS.GetEntity(workplane)->Normal()->NormalU(); goto s;
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case SYMMETRIC_VERT:
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n = SS.GetEntity(workplane)->Normal()->NormalV(); goto s;
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s:
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Vector a = SS.GetEntity(ptA)->PointGetNum();
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Vector b = SS.GetEntity(ptB)->PointGetNum();
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for(int i = 0; i < 2; i++) {
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Vector tail = (i == 0) ? a : b;
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Vector d = (i == 0) ? b : a;
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d = d.Minus(tail);
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// Project the direction in which the arrow is drawn normal
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// to the symmetry plane; for projected symmetry constraints,
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// they might not be in the same direction, even when the
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// constraint is fully solved.
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d = n.ScaledBy(d.Dot(n));
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d = d.WithMagnitude(20/SS.GW.scale);
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Vector tip = tail.Plus(d);
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LineDrawOrGetDistance(tail, tip);
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d = d.WithMagnitude(9/SS.GW.scale);
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LineDrawOrGetDistance(tip, tip.Minus(d.RotatedAbout(gn, 0.6)));
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LineDrawOrGetDistance(tip, tip.Minus(d.RotatedAbout(gn, -0.6)));
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}
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break;
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}
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case AT_MIDPOINT:
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case HORIZONTAL:
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case VERTICAL:
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if(entityA.v) {
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Vector r, u, n;
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if(workplane.v == Entity::FREE_IN_3D.v) {
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r = gr; u = gu; n = gn;
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} else {
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r = SS.GetEntity(workplane)->Normal()->NormalU();
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u = SS.GetEntity(workplane)->Normal()->NormalV();
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n = r.Cross(u);
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}
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// For "at midpoint", this branch is always taken.
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Entity *e = SS.GetEntity(entityA);
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Vector a = SS.GetEntity(e->point[0])->PointGetNum();
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Vector b = SS.GetEntity(e->point[1])->PointGetNum();
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Vector m = (a.ScaledBy(0.5)).Plus(b.ScaledBy(0.5));
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Vector offset = (a.Minus(b)).Cross(n);
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offset = offset.WithMagnitude(13/SS.GW.scale);
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// Draw midpoint constraint on other side of line, so that
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// a line can be midpoint and horizontal at same time.
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if(type == AT_MIDPOINT) offset = offset.ScaledBy(-1);
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if(dogd.drawing) {
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glPushMatrix();
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glxTranslatev(m.Plus(offset));
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glxOntoWorkplane(r, u);
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glxWriteTextRefCenter(
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(type == HORIZONTAL) ? "H" : (
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(type == VERTICAL) ? "V" : (
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(type == AT_MIDPOINT) ? "M" : NULL)));
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glPopMatrix();
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} else {
|
|
dogd.refp = m.Plus(offset);
|
|
Point2d ref = SS.GW.ProjectPoint(dogd.refp);
|
|
dogd.dmin = min(dogd.dmin, ref.DistanceTo(dogd.mp)-10);
|
|
}
|
|
} else {
|
|
Vector a = SS.GetEntity(ptA)->PointGetNum();
|
|
Vector b = SS.GetEntity(ptB)->PointGetNum();
|
|
|
|
Entity *w = SS.GetEntity(SS.GetEntity(ptA)->workplane);
|
|
Vector cu = w->Normal()->NormalU();
|
|
Vector cv = w->Normal()->NormalV();
|
|
Vector cn = w->Normal()->NormalN();
|
|
|
|
int i;
|
|
for(i = 0; i < 2; i++) {
|
|
Vector o = (i == 0) ? a : b;
|
|
Vector oo = (i == 0) ? a.Minus(b) : b.Minus(a);
|
|
Vector d = (type == HORIZONTAL) ? cu : cv;
|
|
if(oo.Dot(d) < 0) d = d.ScaledBy(-1);
|
|
|
|
Vector dp = cn.Cross(d);
|
|
d = d.WithMagnitude(14/SS.GW.scale);
|
|
Vector c = o.Minus(d);
|
|
LineDrawOrGetDistance(o, c);
|
|
d = d.WithMagnitude(3/SS.GW.scale);
|
|
dp = dp.WithMagnitude(2/SS.GW.scale);
|
|
if(dogd.drawing) {
|
|
glBegin(GL_QUADS);
|
|
glxVertex3v((c.Plus(d)).Plus(dp));
|
|
glxVertex3v((c.Minus(d)).Plus(dp));
|
|
glxVertex3v((c.Minus(d)).Minus(dp));
|
|
glxVertex3v((c.Plus(d)).Minus(dp));
|
|
glEnd();
|
|
} else {
|
|
Point2d ref = SS.GW.ProjectPoint(c);
|
|
dogd.dmin = min(dogd.dmin, ref.DistanceTo(dogd.mp)-6);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
default: oops();
|
|
}
|
|
}
|
|
|
|
void Constraint::Draw(void) {
|
|
dogd.drawing = true;
|
|
DrawOrGetDistance(NULL);
|
|
}
|
|
|
|
double Constraint::GetDistance(Point2d mp) {
|
|
dogd.drawing = false;
|
|
dogd.mp = mp;
|
|
dogd.dmin = 1e12;
|
|
|
|
DrawOrGetDistance(NULL);
|
|
|
|
return dogd.dmin;
|
|
}
|
|
|
|
Vector Constraint::GetLabelPos(void) {
|
|
dogd.drawing = false;
|
|
dogd.mp.x = 0; dogd.mp.y = 0;
|
|
dogd.dmin = 1e12;
|
|
|
|
Vector p;
|
|
DrawOrGetDistance(&p);
|
|
return p;
|
|
}
|
|
|
|
Vector Constraint::GetReferencePos(void) {
|
|
dogd.drawing = false;
|
|
|
|
dogd.refp = SS.GW.offset.ScaledBy(-1);
|
|
DrawOrGetDistance(NULL);
|
|
|
|
return dogd.refp;
|
|
}
|
|
|