public static void DrawGradientIntPolygon(this Texture2D texture, IntPolygon polygon, Color color0, Color color1)
{
if (polygon.Count < 2)
{
return;
}
for (var i = 0; i < polygon.Count; i++)
{
var distance = Vertex2.Distance((Vertex2)polygon[i], (Vertex2)polygon[i + 1]);
Action <int, int> draw;
if (distance > 0)
{
draw = (x, y) =>
{
var percent = Vertex2.Distance((Vertex2)polygon[i], new Vertex2(x, y)) / distance;
texture.SetPixel(x, y, Color.Lerp(color0, color1, percent));
};
}
else
{
draw = (x, y) => texture.SetPixel(x, y, color0);
}
BresenhamLine(polygon[i], polygon[i + 1], draw);
}
texture.Apply();
}
public static float PointToLine(Vertex2 point, Vertex2 lineStart, Vertex2 lineEnd)
{
Vertex2 v = lineEnd - lineStart;
Vertex2 w = point - lineStart;
float c1 = Vertex2.Dot(w, v);
float c2 = Vertex2.Dot(v, v);
float b = c1 / c2;
Vertex2 pb = lineStart + b * v;
return(Vertex2.Distance(point, pb));
}
public static void DrawGradientLine(this Texture2D texture, int x0, int y0, int x1, int y1, Color color0,
Color color1)
{
var distance = Vertex2.Distance(new Vertex2(x0, y0), new Vertex2(x1, y1));
Action <int, int> draw;
if (distance > 0)
{
draw = (x, y) =>
{
var percent = Vertex2.Distance(new Vertex2(x0, y0), new Vertex2(x, y)) / distance;
texture.SetPixel(x, y, Color.Lerp(color0, color1, percent));
};
}
else
{
draw = (x, y) => texture.SetPixel(x, y, color0);
}
BresenhamLine(x0, y0, x1, y1, draw);
texture.Apply();
}
public static float PointToLineSegment(Vertex2 point, Vertex2 segmentStart, Vertex2 segmentEnd)
{
Vertex2 v = segmentEnd - segmentStart;
Vertex2 w = point - segmentStart;
float c1 = Vertex2.Dot(w, v);
if (c1 <= 0)
{
return(Vertex2.Distance(point, segmentStart));
}
float c2 = Vertex2.Dot(v, v);
if (c2 <= c1)
{
return(Vertex2.Distance(point, segmentEnd));
}
float b = c1 / c2;
Vertex2 pb = segmentStart + b * v;
return(Vertex2.Distance(point, pb));
}