public static PaintingCanvas CreateInstance(int width, int height)
{
PaintingCanvas paintingCanvas = new PaintingCanvas();
paintingCanvas.InitCanvas(width, height);
return(paintingCanvas);
}
PaintingCanvas GetTriangleShadow(Triangle triangle, int canvasHeight, int canvasWidth)
{
// Create separate canvases for the triangles shadows
PaintingCanvas shadowCanvas = PaintingCanvas.CreateInstance(canvasWidth, canvasHeight);
Shadow.PaintTriangleShadow(triangle, shadowCanvas);
return(shadowCanvas);
}
public static void PaintTriangleShadow(Triangle t, PaintingCanvas canvas)
{
ShadowData s = new ShadowData(t);
for (int i = 0; i < canvas.Height; i++)
{
int y = canvas.Height / 2 - i;
for (int j = 0; j < canvas.Width; j++)
{
int x = j - canvas.Width / 2;
if (s.IsPointInsideShadow(x * 0.01f, y * 0.01f))
{
canvas.DrawPixel(i, j, Colors.White);
}
}
}
}
public PaintingCanvas PaintRedGreenTriangles(Triangle redTriangle, Triangle greenTriangle)
{
// Canvas settings
const int width = 360;
const int height = 360;
const float pixelSize = 0.01f;
// Camera settings
const float yOffset = 10;
const float focalLength = 5;
// Transform the triangles for the camera's perspective
Triangle perspectiveRedTriangle = GetTriangleInPerspective(redTriangle, focalLength);
Triangle perspectiveGreenTriangle = GetTriangleInPerspective(greenTriangle, focalLength);
// Triangle shadows
PaintingCanvas t1Shadow = GetTriangleShadow(perspectiveRedTriangle, width, height);
PaintingCanvas t2Shadow = GetTriangleShadow(perspectiveGreenTriangle, width, height);
Plane plane1 = new Plane(redTriangle);
Plane plane2 = new Plane(greenTriangle);
double[,] zBuffer = new double[width, height];
FillBuffer(zBuffer, 1000000);
PaintingCanvas trianglesCanvas = PaintingCanvas.CreateInstance(width, height);
for (int i = 0; i < trianglesCanvas.Height; i++)
{
float y = (trianglesCanvas.Height / 2 - i) * pixelSize;
for (int j = 0; j < trianglesCanvas.Width; j++)
{
float x = (j - trianglesCanvas.Width / 2) * pixelSize;
// Draw triangle 1
if (t1Shadow.IsPixelColored(i, j))
{
Point cameraPoint = new Point(x, yOffset, y);
Vector3 line = new Vector3(-x, 1, -y);
double d = plane1.DistanceToPlane(cameraPoint, line);
if (d < zBuffer[i, j])
{
zBuffer[i, j] = d;
trianglesCanvas.DrawPixel(i, j, Colors.Red);
}
}
// Draw triangle 2
if (t2Shadow.IsPixelColored(i, j))
{
Point cameraPoint = new Point(x, yOffset, y);
Vector3 line = new Vector3(-x, 1, -y);
double d = plane2.DistanceToPlane(cameraPoint, line);
if (d < zBuffer[i, j])
{
zBuffer[i, j] = d;
trianglesCanvas.DrawPixel(i, j, Colors.Lime);
}
}
}
}
trianglesCanvas.Save();
return(trianglesCanvas);
}
