Files
shape_library/Shapes/Shape.cs
2019-10-23 19:06:40 -06:00

46 lines
1.1 KiB
C#

using System;
using System.Collections.Generic;
using System.Drawing;
namespace Shapes
{
public abstract class Shape
{
public abstract double Width { get; }
public abstract double Height { get; }
public abstract double ComputeArea();
public abstract Point CenterPoint { get; }
public virtual List<Point> Points { get; }
public abstract void Scale(double scaleFactor);
public void Rotate(double degrees)
{
double radians = degrees * (Math.PI / 180);
double cosTheta = Math.Cos(radians);
double sinTheta = Math.Sin(radians);
foreach (var point in Points)
{
var oldPoint = point;
var tempX = oldPoint.X - CenterPoint.X;
var tempY = oldPoint.Y - CenterPoint.X;
var rotatedX = tempX*cosTheta - tempY*sinTheta;
var rotatedY = tempX*sinTheta + tempY*cosTheta;
point.X = rotatedX + CenterPoint.X;
point.Y = rotatedY + CenterPoint.Y;
}
}
}
}