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101 lines
2.4 KiB
C++
101 lines
2.4 KiB
C++
#include "GeomTest.h"
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Pointf LineCross(Pointf a, Pointf a1, Pointf b, Pointf b1)
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{
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Pointf A = a1 - a;
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Pointf B = b1 - b;
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double d = A.y * B.x - B.y * A.x;
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if(d == 0)
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return Null;
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double tb = (A.x * (b.y - a.y) + A.y * (a.x - b.x)) / d;
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if(tb <= 0 || tb >= 1)
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return Null;
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double ta = (B.x * tb + b.x - a.x) / A.x;
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return ta > 0 && ta < 1 ? B * tb + b : Null;
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}
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static int sCrosses(Pointf a, double y0, Pointf b, Pointf b1, double y1)
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{
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double By = b1.y - b.y;
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if(By == 0)
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return (y0 < b.y && b.y < y1 || y0 > b.y && b.y > y1) &&
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(a.y == b.y && a.x < b.x)/* || (a.y == b1.y && a.x < b1.x)*/;
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if(a.y == b.y)
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return (y0 < b.y && b.y < b1.y || y0 > b.y && b.y > b1.y) && b.x > a.x;
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if(a.y == b1.y)
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return 0;
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// return (b.y < b1.y && b1.y < y2 || b.y > b1.y && b1.y > y2) && b1.x > a.x;
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double tb = (a.y - b.y) / By;
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return tb >= 0 && tb < 1 && (b1.x - b.x) * tb + b.x - a.x > 0;
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}
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bool InPolygon(Pointf p, const Vector<Pointf>& polygon)
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{
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int q = 0;
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if(polygon.GetCount() < 2)
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return false;
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int n = polygon.GetCount();
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for(int i = 0; i < polygon.GetCount(); i++)
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q += sCrosses(p, polygon[(i + n - 1) % n].y, polygon[i], polygon[(i + 1) % n], polygon[(i + 2) % n].y);
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return q & 1;
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}
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void GeomTest::LeftDown(Point p, dword flags)
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{
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p = 4 * p / 4;
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if(flags & K_ALT) {
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paintin = !paintin;
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Refresh();
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return;
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}
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if(flags & K_CTRL)
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polygon.Clear();
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polygon.Add(p);
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Refresh();
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}
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void GeomTest::MouseMove(Point p, dword)
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{
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point = p;
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Refresh();
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}
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void GeomTest::Paint(Draw& w)
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{
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Size sz = GetSize();
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w.DrawRect(sz, SWhite);
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if(polygon.GetCount() == 0)
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return;
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if(polygon.GetCount() == 1) {
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w.DrawRect((int)polygon[0].x, (int)polygon[0].y, 1, 1, SBlack);
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return;
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}
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for(int i = 0; i < polygon.GetCount() - 1; i++)
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w.DrawLine(polygon[i], polygon[i + 1]);
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w.DrawLine(polygon[i], polygon[0]);
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// if(paintin)
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for(int i = 0; i < polygon.GetCount(); i++) {
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int y = polygon[i].y;
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for(int x = 0; x < sz.cx; x++)
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if(InPolygon(Pointf(x, y), polygon))
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w.DrawRect(x, y, 1, 1, SLtCyan);
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}
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if(InPolygon(point, polygon))
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w.DrawText(0, 0, "IN", Arial(20).Bold());
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}
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GeomTest::GeomTest()
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{
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BackPaint();
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paintin = false;
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polygon.Add(Pointf(100, 100));
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polygon.Add(Pointf(200, 100));
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polygon.Add(Pointf(150, 150));
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polygon.Add(Pointf(250, 150));
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}
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GUI_APP_MAIN
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{
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GeomTest().Run();
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}
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