private void btnDraw_Click(object sender, EventArgs e)
{
int selectedIndex = cbbShape.SelectedIndex;
if (selectedIndex < 0)
{
return;
}
switch (selectedIndex)
{
case 0:
_graphics.Clear(Color.White);
_shape = new Circle(_drawing,
new PointF(
_ucCircleInfo.CircleX,
_ucCircleInfo.CircleY),
_ucCircleInfo.CircleRadius, pnlColor.BackColor);
_shape.Draw(_graphics);
break;
case 1:
_graphics.Clear(Color.White);
_shape = new ConcreteAbstractions.Rectangle(_drawing,
new PointF(_ucRectangleInfo.RectX, _ucRectangleInfo.RectY),
new SizeF(_ucRectangleInfo.RectWidth, _ucRectangleInfo.RectHeight),
pnlColor.BackColor);
_shape.Draw(_graphics);
break;
default: break;
}
}
static void Main(string[] args)
{
Shape s = new Shape();
s.Draw();
Rectangle r = new Rectangle();
r.Draw();
//OO Rule - Base Class ref variable can hold derived class object
Shape shapeRef = new Rectangle();
shapeRef.Draw(); //Late Binding
//All methods in a class are default non-virtual
}
public static void DrawShapes()
{
Shape shape = null;
do
{
Console.Clear();
Console.WriteLine("[1] Triangle");
Console.WriteLine("[2] Circle");
Console.WriteLine("[3] Rectange");
Console.WriteLine("[4] All");
ConsoleKey input = Console.ReadKey().Key;
switch (input)
{
case ConsoleKey.D1:
shape = new Triangle();
break;
case ConsoleKey.D2:
shape = new Circle();
break;
case ConsoleKey.D3:
shape = new Rectangle();
break;
case ConsoleKey.D4:
shape = new Shape();
break;
}
shape?.Draw();
}while (Console.ReadKey().Key != ConsoleKey.Spacebar);
}