public static void FloodFill(Bitmap b, Point p, Color newColor)
{
var oldColor = b.GetPixel(p.X, p.Y);
var stack = new StackArrayList <Point>();
stack.Push(p);
while (stack.Count != 0)
{
p = stack.Pop();
if (b.GetPixel(p.X, p.Y).ToArgb() != oldColor.ToArgb())
{
continue;
}
b.SetPixel(p.X, p.Y, newColor);
stack.Push(new Point(p.X, p.Y + 1));
stack.Push(new Point(p.X + 1, p.Y));
stack.Push(new Point(p.X, p.Y - 1));
stack.Push(new Point(p.X - 1, p.Y));
stack.Push(new Point(p.X + 1, p.Y + 1));
stack.Push(new Point(p.X - 1, p.Y + 1));
stack.Push(new Point(p.X + 1, p.Y - 1));
stack.Push(new Point(p.X - 1, p.Y - 1));
}
}
public void Paint(Graphics g)
{
Transform(g);
foreach (var command in _commands)
{
var stack = new StackArrayList <string>();
foreach (var param in command)
{
stack.Push(param);
}
switch (stack.Pop().ToLower())
{
case "setlinewidth":
p.Width = int.Parse(stack.Pop());
break;
case "setrgbcolor":
var ci = CultureInfo.InvariantCulture;
var blue = (int)(double.Parse(stack.Pop(), ci) * 255);
var green = (int)(double.Parse(stack.Pop(), ci) * 255);
var red = (int)(double.Parse(stack.Pop(), ci) * 255);
p.Brush = new SolidBrush(Color.FromArgb(red, green, blue));
break;
case "arc":
var sweepAngle = float.Parse(stack.Pop());
var startAngle = float.Parse(stack.Pop());
var radius = float.Parse(stack.Pop());
var y = float.Parse(stack.Pop());
var x = float.Parse(stack.Pop());
g.DrawArc(p, x - radius, y - radius, radius * 2, radius * 2, startAngle, sweepAngle);
break;
case "moveto":
_y1 = int.Parse(stack.Pop());
_x1 = int.Parse(stack.Pop());
break;
case "lineto":
var y2 = int.Parse(stack.Pop());
var x2 = int.Parse(stack.Pop());
g.DrawLine(p, _x1, _y1, x2, y2);
_x1 = x2;
_y1 = y2;
break;
}
}
}
public static double EvaluateExpression(this string expression)
{
var operations = new StackArrayList <string>();
var values = new StackArrayList <double>();
var tokens = expression.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var t in tokens)
{
if (t.IsNumeric())
{
values.Push(double.Parse(t));
}
else
{
operations.Push(t);
}
if (values.Count != 2)
{
continue;
}
var v2 = values.Pop();
var v1 = values.Pop();
switch (operations.Pop())
{
case "+":
values.Push(v1 + v2);
break;
case "-":
values.Push(v1 - v2);
break;
case "*":
values.Push(v1 * v2);
break;
case "/":
values.Push(v1 / v2);
break;
}
}
return(values.Pop());
}
