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44 lines
No EOL
1 KiB
C++
44 lines
No EOL
1 KiB
C++
#include "GLDraw.h"
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namespace Upp {
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void Polyline(GLTriangles& tr, const Vector<Pointf>& p, double width, Color color, double alpha, bool close)
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{
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int m = 1;
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if(p.GetCount() < 2)
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return;
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if(p.GetCount() && close && p[0] != p.Top())
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m = 0;
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width *= 0.5;
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int fv11, fv12, pv21, pv22;
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for(int i = 0; i < p.GetCount() - m; i++) {
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Pointf p1 = p[i];
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Pointf p2 = p[i + 1 < p.GetCount() ? i + 1 : 0];
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Pointf un = width * Normalize(Orthogonal(p2 - p1));
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int v11 = tr.Vertex(p1 + un, color, alpha);
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int v12 = tr.Vertex(p1 - un, color, alpha);
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int v21 = tr.Vertex(p2 + un, color, alpha);
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int v22 = tr.Vertex(p2 - un, color, alpha);
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tr.Triangle(v11, v12, v21);
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tr.Triangle(v12, v22, v21);
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if(i) { // bevel join with previous
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tr.Triangle(v11, pv21, pv22);
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tr.Triangle(v12, pv21, pv22);
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}
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else {
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fv11 = v11;
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fv12 = v12;
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}
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pv21 = v21;
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pv22 = v22;
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}
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if(close || p[0] == p.Top()) {
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tr.Triangle(fv11, pv21, pv22);
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tr.Triangle(fv12, pv21, pv22);
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}
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}
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}; |