private static int IntepolateValue(int val1, int val2, float delta, string mode)
{
switch (mode)
{
case BridgeInterpolationMode.HIGHEST:
case BridgeInterpolationMode.BRIGHTNESS_HIGHEST:
return(Math.Max(val1, val2));
case BridgeInterpolationMode.LOWEST:
case BridgeInterpolationMode.BRIGHTNESS_LOWEST:
return(Math.Min(val1, val2));
case BridgeInterpolationMode.LINEAR:
return((int)Math.Round(InterpolationTools.Linear(val1, val2, delta)));
case BridgeInterpolationMode.IN_SINE:
return((int)Math.Round(InterpolationTools.EaseInSine(val1, val2, delta)));
case BridgeInterpolationMode.OUT_SINE:
return((int)Math.Round(InterpolationTools.EaseOutSine(val1, val2, delta)));
case BridgeInterpolationMode.IN_OUT_SINE:
return((int)Math.Round(InterpolationTools.EaseInOutSine(val1, val2, delta)));
default:
throw new Exception("DrawBezierPathMode.IntepolateValue: \"" + mode + "\" mode is not supported!");
}
}
// This generates the vertices to split the line with, from start to end
private List <Vector2D> GenerateCurve(Linedef line)
{
// Fetch settings from the panel
bool fixedcurve = panel.FixedCurve;
int vertices = Math.Min(panel.Vertices, (int)Math.Ceiling(line.Length / 4));
int distance = panel.Distance;
int angle = (!fixedcurve && distance == 0 ? Math.Max(5, panel.Angle) : panel.Angle);
float theta = Angle2D.DegToRad(angle);
if (distance < 0)
{
theta = -theta; //mxd
}
// Make list
List <Vector2D> points = new List <Vector2D>(vertices);
float segDelta = 1.0f / (vertices + 1); //mxd
Vector2D linecenter = line.GetCenterPoint(); //mxd
//mxd. Special cases...
if (angle == 0)
{
for (int v = 1; v <= vertices; v++)
{
float x = (line.Length * segDelta) * (vertices - v + 1) - line.Length * 0.5f; // Line segment coord
// Rotate and transform to fit original line
Vector2D vertex = new Vector2D(x, 0).GetRotated(line.Angle + Angle2D.PIHALF) + linecenter;
points.Add(vertex);
}
}
else
{
//Added by Anders Åstrand 2008-05-18
//The formulas used are taken from http://mathworld.wolfram.com/CircularSegment.html
//c and theta are known (length of line and angle parameter). d, R and h are
//calculated from those two
//If the curve is not supposed to be a circular segment it's simply deformed to fit
//the value set for distance.
//The vertices are generated to be evenly distributed (by angle) along the curve
//and lastly they are rotated and moved to fit with the original line
//calculate some identities of a circle segment (refer to the graph in the url above)
float c = line.Length;
float d = (c / (float)Math.Tan(theta / 2)) / 2;
float R = d / (float)Math.Cos(theta / 2);
float h = R - d;
float yDeform = (fixedcurve ? 1 : distance / h);
float xDelta = Math.Min(1, yDeform); //mxd
for (int v = 1; v <= vertices; v++)
{
//calculate the angle for this vertex
//the curve starts at PI/2 - theta/2 and is segmented into vertices+1 segments
//this assumes the line is horisontal and on y = 0, the point is rotated and moved later
float a = (Angle2D.PI - theta) / 2 + v * (theta / (vertices + 1));
//calculate the coordinates of the point, and distort the y coordinate
//using the deform factor calculated above
float xr = (float)Math.Cos(a) * R; //mxd. Circle segment coord
float xl = (line.Length * segDelta) * (vertices - v + 1) - line.Length * 0.5f; // mxd. Line segment coord
float x = InterpolationTools.Linear(xl, xr, xDelta); //mxd
float y = ((float)Math.Sin(a) * R - d) * yDeform;
//rotate and transform to fit original line
Vector2D vertex = new Vector2D(x, y).GetRotated(line.Angle + Angle2D.PIHALF) + linecenter;
points.Add(vertex);
}
}
// Done
return(points);
}
