private static void DrawLine(Core.CustomSpriteBatch g, Microsoft.Xna.Framework.Graphics.Texture2D sprPixel, Microsoft.Xna.Framework.Vector2 StartPos, Microsoft.Xna.Framework.Vector2 EndPos, Microsoft.Xna.Framework.Color DrawColor)
{
Microsoft.Xna.Framework.Vector2 ScaleFactor = new Microsoft.Xna.Framework.Vector2(EndPos.X - StartPos.X, EndPos.Y - StartPos.Y);
ScaleFactor.Normalize();
while ((int)StartPos.X != EndPos.X)
{
g.Draw(sprPixel, StartPos, DrawColor);
StartPos += ScaleFactor;
}
}
public static void DisplayContour(Core.CustomSpriteBatch g, Microsoft.Xna.Framework.Graphics.Texture2D sprPixel,
Contour2D FirstContour) // Pointer to first contour
{
Vertex2D P;
Contour2D Q, PQ, IQ;
Microsoft.Xna.Framework.Color DrawColor = Microsoft.Xna.Framework.Color.White;
PQ = FirstContour; // Start on first contour
if (PQ != null)
{
IQ = PQ.inside_contours;
}
else
{
IQ = null; // Fetch any inside contour
}
while (PQ != null)
{ // While process contour valid
if (IQ != null)
{ // Check for inside contour
Q = IQ; // Set Q to inside contour
IQ = IQ.nextpeer; // Set IQ to next peer contour
}
else
{ // We have no inside contour
Q = PQ; // Set Q to this contour
PQ = PQ.nextpeer; // Set PQ to next peer contour
if (PQ != null)
{
IQ = PQ.inside_contours;
}
else
{
IQ = null; // Fetch any inside contour of that next peer
}
}
switch (Q.Direction)
{ // Contour direction will set colour
case CONTOUR_DIR.CW_DIR: // CLOCK WISE CONTOUR
DrawColor = Microsoft.Xna.Framework.Color.Blue; // Blue pen
break;
case CONTOUR_DIR.CCW_DIR: // COUNTER CLOCKWISE CONTOUR
DrawColor = Microsoft.Xna.Framework.Color.Red; // Red pen
continue; //Don't draw it as it's probably not useful
case CONTOUR_DIR.UNKNOWN_DIR: // UNKNOWN DIRECTION CONTOUR
DrawColor = Microsoft.Xna.Framework.Color.Green; // Green pen
break;
}
P = Q.FirstVertex; // Start on first vertex
Microsoft.Xna.Framework.Vector2 StartPos = new Microsoft.Xna.Framework.Vector2((int)P.x, (int)P.y);
Microsoft.Xna.Framework.Vector2 EndPos = new Microsoft.Xna.Framework.Vector2();
do
{
P = P.next; // Advance to next vertex pointer
if ((P.v_flags & 0x08) == 0)
{ // Not a lift close move
EndPos.X = (int)P.x;
EndPos.Y = (int)P.y;
DrawLine(g, sprPixel, StartPos, EndPos, DrawColor);
StartPos.X = (int)P.x;
StartPos.Y = (int)P.y;
}
}while (P != Q.FirstVertex); // Until we finish the loop
}
}