73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
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#include "solvespace.h"
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bool Constraint::HasLabel(void) {
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switch(type) {
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case PT_PT_DISTANCE:
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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::DrawOrGetDistance(void) {
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// Unit vectors that describe our current view of the scene.
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Vector gr = SS.GW.projRight;
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Vector gu = SS.GW.projUp;
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Vector gn = gr.Cross(gu);
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switch(type) {
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case PT_PT_DISTANCE: {
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Vector ap = SS.GetPoint(ptA)->GetCoords();
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Vector bp = SS.GetPoint(ptB)->GetCoords();
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Vector ref = ((ap.Plus(bp)).ScaledBy(0.5)).Plus(disp.offset);
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if(dogd.drawing) {
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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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glBegin(GL_LINES);
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glxVertex3v(ap);
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glxVertex3v(ap.Plus(out));
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glxVertex3v(bp);
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glxVertex3v(bp.Plus(out));
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glEnd();
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glPushMatrix();
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glxTranslatev(ref);
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glxOntoCsys(gr, gu);
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glxWriteText("ABCDEFG");
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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 = o.DistanceTo(dogd.mp) - 10;
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}
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break;
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}
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default: oops();
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}
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}
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void Constraint::Draw(void) {
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dogd.drawing = true;
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DrawOrGetDistance();
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}
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double Constraint::GetDistance(Point2d mp) {
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dogd.drawing = false;
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dogd.mp = mp;
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dogd.dmin = 1e12;
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DrawOrGetDistance();
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return dogd.dmin;
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}
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