added shapes collection

1 files changed, 42 insertions, 0 deletions

diff --git a/Sem. 13/ShapeCollection/Triangle.cpp b/Sem. 13/ShapeCollection/Triangle.cpp
new file mode 100644
index 0000000..350b321
--- /dev/null
+++ b/Sem. 13/ShapeCollection/Triangle.cpp
@@ -0,0 +1,42 @@
+#include "Triangle.h"
+#include <limits>
+
+Triangle::Triangle(int x1, int y1, int x2, int y2, int x3, int y3) : Shape(3)
+{
+	setPoint(0, x1, y1);
+	setPoint(1, x2, y2);
+	setPoint(2, x3, y3);
+}
+double Triangle::getArea() const
+{
+	Shape::point p1 = getPointAtIndex(0);
+	Shape::point p2 = getPointAtIndex(1);
+	Shape::point p3 = getPointAtIndex(2);
+
+	return abs(p1.x*p2.y + p2.x*p3.y + p3.x*p1.y - p1.y * p2.x - p2.y*p3.x - p3.y*p1.x) / 2.00;
+}
+double Triangle::getPer() const
+{
+	Shape::point p1 = getPointAtIndex(0);
+	Shape::point p2 = getPointAtIndex(1);
+	Shape::point p3 = getPointAtIndex(2);
+
+	return p1.getDist(p2) + p2.getDist(p3) + p3.getDist(p1);
+}
+
+bool Triangle::isPointIn(int x, int y) const
+{
+	Shape::point p(x, y);
+	Triangle t1(getPointAtIndex(0).x, getPointAtIndex(0).y, getPointAtIndex(1).x, getPointAtIndex(1).y, p.x, p.y);
+	Triangle t2(getPointAtIndex(2).x, getPointAtIndex(2).y, getPointAtIndex(1).x, getPointAtIndex(1).y, p.x, p.y);
+	Triangle t3(getPointAtIndex(2).x, getPointAtIndex(2).y, getPointAtIndex(0).x, getPointAtIndex(0).y, p.x, p.y);
+
+	return abs(t1.getArea() + t2.getArea() + t3.getArea() - getArea()) <= std::numeric_limits<double>::epsilon();
+
+}
+
+Shape* Triangle::clone() const
+{
+	Shape* copy = new Triangle(*this);
+	return copy;
+}