/// <summary>
/// Rotate the control points by the defined value in radians.
/// </summary>
/// <param name="value">The amount to rotate by in radians.</param>
public void Rotate(float value)
{
FMatrix rotationMatrix;
FMatrix.CreateRotationZ(value, out rotationMatrix);
for (int i = 0; i < ControlPoints.Count; i++)
{
ControlPoints[i] = FVector2.Transform(ControlPoints[i], rotationMatrix);
}
}
public void DrawArrow(FVector2 start, FVector2 end, float length, float width, bool drawStartIndicator,
Color color)
{
// Draw connection segment between start- and end-point
DrawSegment(start, end, color);
// Precalculate halfwidth
float halfWidth = width / 2;
// Create directional reference
FVector2 rotation = (start - end);
rotation.Normalize();
// Calculate angle of directional vector
float angle = (float)Math.Atan2(rotation.X, -rotation.Y);
// Create matrix for rotation
FMatrix rotFMatrix = FMatrix.CreateRotationZ(angle);
// Create translation matrix for end-point
FMatrix endFMatrix = FMatrix.CreateTranslation(end.X, end.Y, 0);
// Setup arrow end shape
FVector2[] verts = new FVector2[3];
verts[0] = new FVector2(0, 0);
verts[1] = new FVector2(-halfWidth, -length);
verts[2] = new FVector2(halfWidth, -length);
// Rotate end shape
FVector2.Transform(verts, ref rotFMatrix, verts);
// Translate end shape
FVector2.Transform(verts, ref endFMatrix, verts);
// Draw arrow end shape
DrawSolidPolygon(verts, 3, color, false);
if (drawStartIndicator)
{
// Create translation matrix for start
FMatrix startFMatrix = FMatrix.CreateTranslation(start.X, start.Y, 0);
// Setup arrow start shape
FVector2[] baseVerts = new FVector2[4];
baseVerts[0] = new FVector2(-halfWidth, length / 4);
baseVerts[1] = new FVector2(halfWidth, length / 4);
baseVerts[2] = new FVector2(halfWidth, 0);
baseVerts[3] = new FVector2(-halfWidth, 0);
// Rotate start shape
FVector2.Transform(baseVerts, ref rotFMatrix, baseVerts);
// Translate start shape
FVector2.Transform(baseVerts, ref startFMatrix, baseVerts);
// Draw start shape
DrawSolidPolygon(baseVerts, 4, color, false);
}
}
