public static BitMap2d CreateSampleCircle2(int width)
{
if (width % 2 != 1)
{
width += 1;
}
BitMap2d bmp = new BitMap2d(width, width, 0);
int r = (width - 1) / 2;
int mx = r;
int my = r;
for (int i = 0; i < width; i++)
{
for (int j = 0; j < width; j++)
{
if (j < r)
{
continue;
}
double dis2 = (i - mx) * (i - mx) + (j - my) * (j - my);
if (dis2 < r * r)
{
bmp.SetPixel(i, j, 255);
}
}
}
return(bmp);
}
static void Main(string[] args)
{
BitMap2d bmp = BitMap2d.CreateSampleCircle(201);
BitMap2d bmp2 = Zoom.ZoomOut(bmp, 0.7f);
bmp2.OutputBitMap("1.bmp");
BitMap2d bmp3 = Zoom.ZoomOut2(bmp, 0.7f);
bmp3.OutputBitMap("2.bmp");
}
public static BitMap2d ZoomOut(BitMap2d image, float rate)
{
int w = (int)(image.width * rate) + 1;
int h = (int)(image.height * rate) + 1;
BitMap2d bmp = new BitMap2d(w, h, 0);
for (int i = 0; i < image.width; i++)
{
for (int j = 0; j < image.height; j++)
{
if (image.GetPixel(i, j) == 255)
{
int ni = (int)(i * rate);
int nj = (int)(j * rate);
bmp.SetPixel(ni, nj, 255);
}
}
}
return(bmp);
}
