public override void _Ready()
{
var size = GetViewportRect().Size;
var kochSnowflake = new KochSnowflake()
{
Diameter = size.y / 4,
Generations = 4
};
kochSnowflake.Position = size / 2;
AddChild(kochSnowflake);
}
public static void TestKochSnowflakeExample()
{
var bitmapWidth = 600;
var offsetX = bitmapWidth / 10f;
var offsetY = bitmapWidth / 3.7f;
Bitmap bitmap = KochSnowflake.GetKochSnowflake();
bitmap.GetPixel(0, 0)
.Should()
.Be(Color.FromArgb(255, 255, 255, 255), "because the background should be white");
bitmap.GetPixel((int)offsetX, (int)offsetY)
.Should()
.Be(Color.FromArgb(255, 0, 0, 0), "because the snowflake is drawn in black and this is the position of the first vector");
}
public static void TestIterateMethod()
{
List <Vector2> vectors = new() { new Vector2(0, 0), new Vector2(1, 0) };
List <Vector2> result = KochSnowflake.Iterate(vectors, 1);
result[0].Should().Be(new Vector2(0, 0));
result[1].Should().Be(new Vector2((float)1 / 3, 0));
/* Should().BeApproximately() is not defined for Vector2 or float
* so the x-y-components have to be tested separately and the y-component needs to be cast to double */
result[2].X.Should().Be(0.5f);
((double)result[2].Y).Should().BeApproximately(Math.Sin(Math.PI / 3) / 3, 0.0001);
result[3].Should().Be(new Vector2((float)2 / 3, 0));
result[4].Should().Be(new Vector2(1, 0));
}
public static void BitmapWidthIsZeroOrNegative_ThrowsArgumentOutOfRangeException()
{
Assert.Throws <ArgumentOutOfRangeException>(() => KochSnowflake.GetKochSnowflake(-200));
}
