public static void DrawWiredPolygon(this ZBuffer img, Color color, List <Point> points)
{
if (points.Count < 3)
{
return;
}
var a = points[2] - points[1];
var b = points[0] - points[1];
var normal = b.VectorialProduct(a);
normal.Normalize();
if (normal.Z > 0)
{
return;
}
var p = points.Last();
foreach (var point in points)
{
img.DrawLine(p, point, color);
p = point;
}
}
public void Draw(ZBuffer img)
{
var backGround = Settings.Default.CameraDefaultBackground;
var clipped = _object.Select(p => p.Init).ToList();
for (var y = ZBuffer.WindowMinHeight; y < ZBuffer.WindowMaxHeight; y++)
{
var nodeX = new List <int>();
var points = 0;
int index;
var j = clipped.Count - 1;
for (index = 0; index < clipped.Count; index++)
{
if (clipped[index].Y < y && clipped[j].Y >= y || clipped[j].Y < y && clipped[index].Y >= y)
{
nodeX.Insert(points++, (int)(clipped[index].X + (y - clipped[index].Y) / (clipped[j].Y - clipped[index].Y) * (clipped[j].X - clipped[index].X)));
}
j = index;
}
nodeX = nodeX.OrderBy(p => p).ToList();
for (index = 0; index < points; index += 2)
{
if (nodeX[index] >= ZBuffer.WindowMaxWidth)
{
break;
}
if (nodeX[index + 1] <= ZBuffer.WindowMinWidth)
{
continue;
}
if (nodeX[index] < ZBuffer.WindowMinWidth)
{
nodeX[index] = ZBuffer.WindowMinWidth;
}
if (nodeX[index + 1] >= ZBuffer.WindowMaxWidth)
{
nodeX[index + 1] = ZBuffer.WindowMaxWidth - 1;
}
for (var x = nodeX[index]; x < nodeX[index + 1]; x++)
{
img.SetPixel(x, y, 0, backGround);
}
}
}
//foreach (var polEdge in _object.Select(p => new Line(p.Init, p.Final)))
//{
// polEdge.Draw(img);
//}
}
public static void DrawLine(this ZBuffer img, Point initPoint, Point endPoint, Color color)
{
var init = new Point(initPoint.X, initPoint.Y, initPoint.Z);
var end = new Point(endPoint.X, endPoint.Y, endPoint.Z);
if (!Clip(ref init, ref end, ZBuffer.MinSize, ZBuffer.MaxSize))
{
return;
}
var x = (int)init.X;
var y = (int)init.Y;
var z = init.Z;
var xf = (int)end.X;
var yf = (int)end.Y;
var dx = Math.Abs(xf - x);
var sx = x < xf ? 1 : -1;
var dy = Math.Abs(yf - y);
var sy = y < yf ? 1 : -1;
var err = (dx > dy ? dx : -dy) / 2;
var txz = (end.Z - init.Z) / (dx == 0 ? 1 : dx);
var tyz = (end.Z - init.Z) / (dy == 0 ? 1 : dy);
while (true)
{
img.SetPixel(x, y, z, color);
if (x == xf && y == yf)
{
break;
}
var e2 = err;
if (e2 > -dx)
{
err -= dy;
x += sx;
z += txz;
}
if (e2 >= dy)
{
continue;
}
err += dx;
y += sy;
z += tyz;
}
}
public Camera(Point p, Point vrp, Vector viewUp)
{
_canvas = new ZBuffer();
_p = p;
_vrp = vrp;
_worldMaxWidth = ZBuffer.Width * 0.8;
_worldMaxWidth -= _worldMaxWidth / 2;
_worldMaxHeight = ZBuffer.Height * 0.8;
_worldMaxHeight -= _worldMaxHeight / 2;
_worldMinWidth = -_worldMaxWidth;
_worldMinHeight = -_worldMaxHeight;
_viewUp = viewUp;
_drawAction = new OccultWire(this);
}
public void Draw(ZBuffer img)
{
var clipped = _object.Select(p => p.Init).ToList();
for (var y = ZBuffer.WindowMinHeight; y < ZBuffer.WindowMaxHeight; y++)
{
var nodeX = new List <int>();
var points = 0;
int index;
var j = clipped.Count - 1;
for (index = 0; index < clipped.Count; index++)
{
if (clipped[index].Y < y && clipped[j].Y >= y || clipped[j].Y < y && clipped[index].Y >= y)
{
nodeX.Insert(points++, (int)(clipped[index].X + (y - clipped[index].Y) / (clipped[j].Y - clipped[index].Y) * (clipped[j].X - clipped[index].X)));
}
j = index;
}
nodeX = nodeX.OrderBy(p => p).ToList();
for (index = 0; index < points; index += 2)
{
if (nodeX[index] >= ZBuffer.WindowMaxWidth)
{
break;
}
if (nodeX[index + 1] <= ZBuffer.WindowMinWidth)
{
continue;
}
if (nodeX[index] < ZBuffer.WindowMinWidth)
{
nodeX[index] = ZBuffer.WindowMinWidth;
}
if (nodeX[index + 1] >= ZBuffer.WindowMaxWidth)
{
nodeX[index + 1] = ZBuffer.WindowMaxWidth - 1;
}
for (var x = nodeX[index]; x < nodeX[index + 1]; x++)
{
img.SetPixel(x, y, 0, Color.Blue);
}
}
}
}
public static void DrawPolygon(this ZBuffer img, Color color, params Point[] points)
{
if (points.Length < 3)
{
return;
}
var a = points[2] - points[1];
var b = points[0] - points[1];
var normal = b.VectorialProduct(a);
normal.Normalize();
if (normal.Z <= 0)
{
return;
}
var poly = Clip(points, ZBuffer.MinSize, ZBuffer.MaxSize);
var last = poly.Last();
var ymax = 0;
var ymin = ZBuffer.Height;
var xmax = 0;
var xmin = ZBuffer.Width;
foreach (var point in poly)
{
if (point.X < xmin)
{
xmin = (int)point.X;
}
if (point.X > xmax)
{
xmax = (int)point.X;
}
if (point.Y < ymin)
{
ymin = (int)point.Y;
}
if (point.Y > ymax)
{
ymax = (int)point.Y;
}
}
Draw(img, color, xmin, xmax, ymin, ymax, poly);
}
private static void Draw(ZBuffer img, Color color, int xmin, int xmax, int ymin, int ymax, List <Point> clipped)
{
for (var y = ymin; y < ymax; y++)
{
var inter = new List <Point>();
int index;
var j = clipped.Count - 1;
for (index = 0; index < clipped.Count; index++)
{
if (clipped[index].Y < y && clipped[j].Y >= y || clipped[j].Y < y && clipped[index].Y >= y)
{
var pt = DoesHit(clipped[j], clipped[index], new Point(0, y), new Point(ZBuffer.Width - 1, y));
if (pt != null)
{
inter.Add(pt);
}
}
j = index;
}
inter = inter.OrderBy(p => p.X).ToList();
for (index = 0; index < inter.Count; index += 2)
{
var z = inter[index].Z;
var tx = (inter[index + 1].Z - inter[index].Z) / (inter[index + 1].X - inter[index].X);
var end = (int)inter[index + 1].X;
for (var x = (int)inter[index].X; x < end; x++)
{
img.SetPixel(x, y, z, color);
z += tx;
}
}
}
}
