public void CompareTangentToQuadratic()
{
QuadraticBezier2f quadratic = new QuadraticBezier2f();
quadratic.C0 = new Vector2f(0.027f, 0.065f);
quadratic.C1 = new Vector2f(1.234f, 0.012f);
quadratic.C2 = new Vector2f(0.816f, 1.298f);
Bezier2f bezier = new Bezier2f(2);
bezier.Control[0] = quadratic.C0;
bezier.Control[1] = quadratic.C1;
bezier.Control[2] = quadratic.C2;
int count = 8;
for (int i = 0; i < count; i++)
{
float t = i / (count - 1.0f);
Vector2f t0 = quadratic.Tangent(t);
Vector2f t1 = bezier.Tangent(t);
Assert.AreEqual(Math.Round(t0.x, PRECISION), Math.Round(t1.x, PRECISION));
Assert.AreEqual(Math.Round(t0.y, PRECISION), Math.Round(t1.y, PRECISION));
}
}
public void Split()
{
Bezier2f bezier = new Bezier2f(3);
bezier.Control[0] = new Vector2f(0.0f, 0.0f);
bezier.Control[1] = new Vector2f(0.0f, 2.5f);
bezier.Control[2] = new Vector2f(2.5f, 5.0f);
bezier.Control[3] = new Vector2f(5, 5);
float split = 0.5f;
Bezier2f b0, b1;
bezier.Split(split, out b0, out b1);
Assert.AreEqual(bezier.Degree, b0.Degree);
Assert.AreEqual(bezier.Degree, b1.Degree);
Assert.AreEqual(bezier.Control[0], b0.Control[0]);
Assert.AreEqual(bezier.Control[3], b1.Control[3]);
Vector2f p = bezier.Position(split);
Assert.AreEqual(p, b0.Control[3]);
Assert.AreEqual(p, b1.Control[0]);
Assert.AreEqual(Math.Round(bezier.Length(100), 4), Math.Round(b0.Length(50) + b1.Length(50), 4));
}
Bezier2f[] GenerateBeziers(Vector2f[] list)
{
Bezier2f[] res = new Bezier2f[(list.Length - 1) / 2];
for (int i = 2; i < list.Length; i += 2)
{
res[(i - 2) / 2] = new Bezier2f(list[i - 2], list[i - 1], list[i]);
}
return(res);
}
Bezier2f[] GenerateBeziersRefl(Vector2f[] list)
{
Bezier2f[] res = new Bezier2f[list.Length - 2];
for (int i = 2; i < list.Length; i++)
{
Vector2f reflected = list[i - 2] + 2.0f * (list[i - 1] - list[i - 2]);
res[i - 2] = new Bezier2f(list[i - 1], reflected, list[i]);
}
return(res);
}
public void PenVG(GraphicsDevice device)
{
ICanvas canvas = new GraphicsCanvas(device, device.SwapChain, new Vector2f(1.0f, 1.0f));
// We first create all needed fills.
SolidFill solidFill = new SolidFill(Colour.Red);
Pen pen = new Pen(solidFill, 0.003f, 0.0f, OutlineEnd.Square);
Bezier2f line = new Bezier2f(new Vector2f(0.1f, 0.5f), new Vector2f(0.3f, 1.0f),
new Vector2f(0.9f, 0.5f));
Bezier2f line2 = new Bezier2f(new Vector2f(0.1f, 0.5f), new Vector2f(0.3f, 0.0f),
new Vector2f(0.9f, 0.5f));
LineSegment2f seg = new LineSegment2f(new Vector2f(0, 0.5f), new Vector2f(0.7f, 0.6f));
bool exit = false;
device.SwapChain.Window.Closed += delegate(Window w) { exit = true; };
float a = 0;
while (!exit)
{
device.SwapChain.Window.DoEvents();
using (DeviceLock l = device.Lock())
{
device.Clear(device.SwapChain, Colour.Green);
device.SetViewports(new Region2i(0, 0, (int)device.SwapChain.Width, (int)device.SwapChain.Height));
line.A = 0.5f * new Vector2f(1, 1) + new Vector2f(1, 1) * 0.5f * MathHelper.Cos(a);
line2.B = 0.5f * new Vector2f(1, 1) + new Vector2f(1, 1) * 0.5f * MathHelper.Sin(a);
// We render.
canvas.Begin(CanvasRenderFlags.None);
canvas.DrawShape(pen, line, null);
canvas.DrawShape(pen, seg, null);
canvas.DrawShape(pen, line2, null);
canvas.End();
}
device.SwapChain.Present();
a += 0.01f;
}
}
public void CompareLengthToQuadratic()
{
QuadraticBezier2f quadratic = new QuadraticBezier2f();
quadratic.C0 = new Vector2f(0.027f, 0.065f);
quadratic.C1 = new Vector2f(1.234f, 0.012f);
quadratic.C2 = new Vector2f(0.816f, 1.298f);
Bezier2f bezier = new Bezier2f(2);
bezier.Control[0] = quadratic.C0;
bezier.Control[1] = quadratic.C1;
bezier.Control[2] = quadratic.C2;
float len0 = quadratic.Length;
float len1 = bezier.Length(100);
Assert.AreEqual(Math.Round(len0, 4), Math.Round(len1, 4));
}
