public bool SetPixel(int x, int y, GraphicsPixel p)
{
if (x >= 0 && x < Width && y >= 0 && y < Height)
{
pColData[y * Width + x] = p;
return(true);
}
else
{
return(false);
}
}
public Sprite(int w, int h)
{
var bmp = new Bitmap(w, h, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
Width = w;
Height = h;
pColData = new GraphicsPixel[Width * Height];
for (int x = 0; x < pColData.Length; x++)
{
pColData[x] = GraphicPixel.BLANK;
}
}
public void LoadFromFile(string FileName)
{
this.FileName = FileName;
var bmp = (Bitmap)Bitmap.FromFile(this.FileName);
Width = bmp.Width;
Height = bmp.Height;
pColData = new GraphicsPixel[Width * Height];
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
var c = bmp.GetPixel(x, y);
SetPixel(x, y, new GraphicsPixel(c.R, c.G, c.B, c.A));
}
}
}
public GraphicsPixel SampleBL(float u, float v)
{
u = u * Width - 0.5f;
v = v * Height - 0.5f;
int x = (int)Math.Floor(u); // cast to int rounds toward zero, not downward
int y = (int)Math.Floor(v); // Thanks @joshinils
float u_ratio = u - x;
float v_ratio = v - y;
float u_opposite = 1 - u_ratio;
float v_opposite = 1 - v_ratio;
GraphicsPixel p1 = GetPixel(Math.Max(x, 0), Math.Max(y, 0));
GraphicsPixel p2 = GetPixel(Math.Min(x + 1, Width - 1), Math.Max(y, 0));
GraphicsPixel p3 = GetPixel(Math.Max(x, 0), Math.Min(y + 1, Height - 1));
GraphicsPixel p4 = GetPixel(Math.Min(x + 1, Width - 1), Math.Min(y + 1, Height - 1));
return(new GraphicsPixel(
(byte)((p1.r * u_opposite + p2.r * u_ratio) * v_opposite + (p3.r * u_opposite + p4.r * u_ratio) * v_ratio),
(byte)((p1.g * u_opposite + p2.g * u_ratio) * v_opposite + (p3.g * u_opposite + p4.g * u_ratio) * v_ratio),
(byte)((p1.b * u_opposite + p2.b * u_ratio) * v_opposite + (p3.b * u_opposite + p4.b * u_ratio) * v_ratio)));
}
