public void TestArrowGeneration()
{
int count = WireframeArrowVertexGenerator.VertexCount;
VertexPositionColor[] vertices = new VertexPositionColor[count + 1];
WireframeArrowVertexGenerator.Generate(
vertices, 1,
new Vector3(10.0f, 20.0f, 30.0f), Vector3.Forward,
Color.Blue
);
Assert.AreEqual(Vector3.Zero, vertices[0].Position);
Assert.AreNotEqual(Vector3.Zero, vertices[1].Position);
Assert.AreNotEqual(Vector3.Zero, vertices[count - 1].Position);
}
/// <summary>Draws a wireframe arrow into the scene to visualize a vector</summary>
/// <param name="origin">
/// Location at which to draw the arrow (this will form the exact center of
/// the drawn arrow's base)
/// </param>
/// <param name="direction">
/// Direction the arrow is pointing into. The arrow's size is relative to
/// the length of this vector.
/// </param>
/// <param name="color">Color of the wireframe to draw</param>
public void DrawArrow(Vector3 origin, Vector3 direction, Color color)
{
const int VertexCount = WireframeArrowVertexGenerator.VertexCount;
// If we would collide with the triangles in the array or there simply
// isn't enough space left, set the overflow flag and silently skip drawing
int proposedStart = this.lineIndex - (VertexCount - 1);
if (proposedStart < this.triangleIndex)
{
this.overflowed = true;
return;
}
// Generate the vertices for box' wireframe
WireframeArrowVertexGenerator.Generate(
this.queuedVertices, proposedStart, origin, direction, color
);
this.lineIndex -= VertexCount;
}