static void PrintShapeDetails(IShape shape)
{
//Circle circle = (Circle)shape; // throws invalidcastexception when a rectangle is passed
// downcasting can fail!
Console.WriteLine($"Sides: {shape.Sides}");
Console.WriteLine($"Area: {shape.CalculateArea()}");
}
static void Main(string[] args)
{
ShapeFactory shapeFactory = new ShapeFactory();
double sum = 0;
for (int i = 0; i < 10; i++)
{
IShape shape = shapeFactory.CreateRandomShape();
if (shape.IsApproved())
{
Console.Write("合法图形。");
shape.Describe();
Console.WriteLine("面积：" + shape.CalculateArea());
sum += shape.CalculateArea();
}
else
{
Console.Write("不合法图形。");
}
}
Console.WriteLine("面积之和：" + sum);
}
//Sets mouse x and y coordinates. Gets cursor position. Removes ouline of the selected shape if any.
//Tries to find if cursor is inside a shape when clicked.
//If its not - deselectes selected shape if any and sets selected area to 0.0
//If it is - sets new selected shape. Sets selected shape area. Increaces current max layer and sets shape layer
//And draws shape.
//Note: always selects the top most shape even if 2 or more shapes are on top of one another
private void Canvas_MouseDown(object sender, MouseEventArgs e)
{
this.mouseDownXCoordinate = e.X;
this.mouseDownYCoordinate = e.Y;
if (e.Button == MouseButtons.Left)
{
PointF cursorPosition = new PointF(e.X, e.Y);
if (this.selectedShape != null)
{
this.selectedShape.Outline(this.graphics, this.selectedShape.Color);
}
bool cursorIsOnAnyShape = false;
foreach (IShape shape in shapes.OrderByDescending(s => s.CurrentLayer))
{
bool isInside = shape.Contains(cursorPosition);
if (isInside)
{
this.currentMaxLayer += 1;
this.selectedShape = shape;
this.SelectedShapeAreaNumber.Text = $"{selectedShape.CalculateArea():f1}";
this.selectedShape.ChangeCurrentLayer(this.currentMaxLayer);
this.selectedShape.Draw(this.graphics);
cursorIsOnAnyShape = true;
break;
}
}
if (!cursorIsOnAnyShape)
{
this.selectedShape = null;
this.SelectedShapeAreaNumber.Text = "0.0";
}
}
}
public static double CalculateShapeArea(IShape shape)
{
return(shape.CalculateArea());
}
public string OutputAsJSON(IShape shape)
{
return($"{{ \"Area\" : {shape.CalculateArea()}, \"Perimeter\" : {shape.CalculatePerimeter()} }}");
}
public string OutputAsHTML(IShape shape)
{
return($"<p>Area : {shape.CalculateArea()}</p><br /><p>Perimeter : {shape.CalculatePerimeter()}</p>");
}
static bool AreTheSameSize(IShape s1, IShape s2)
{
return(s1.CalculateArea() == s2.CalculateArea());
}
static void PrintAreaForShape(IShape shape)
{
Console.WriteLine();
Console.WriteLine($"The area for the {shape.GetShapeName()} is {shape.CalculateArea()}");
}
private void ShowShape(IShape sh)
{
sh.Display();
sh.CalculateArea();
}
public static void PrintShapeInfo(IShape obj)
{
Console.Write("Area: " + obj.CalculateArea());
}
private static void Display(IShape s)
{
Console.WriteLine(s.CalculateArea());
}
public void CalculateArea(IShape shape)
{
ResultArea = shape.CalculateArea();
}