private void tabs_SelectedIndexChanges(object sender, EventArgs e)
{
if (tabs.SelectedTab == tpHeightmap && _heightMap == null)
{
_heightMap = new Bitmap(_drawingSurface.Width, _drawingSurface.Height, PixelFormat.Format8bppIndexed);
// Create grayscale palette
ColorPalette pal = _heightMap.Palette;
for (int i = 0; i <= 255; i++)
{
pal.Entries[i] = Color.FromArgb(i, i, i);
}
_heightMap.Palette = pal; // re-setting activates palette
// Draw map
var heightBuffer = _drawingSurface.GetHeightBuffer();
var bmd = _heightMap.LockBits(new Rectangle(0, 0, _drawingSurface.Width, _drawingSurface.Height), ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
uint idx = 0;
unsafe {
for (int row = 0; row < _drawingSurface.Height; row++)
{
byte *w = (byte *)bmd.Scan0.ToPointer() + bmd.Stride * row;
for (int col = 0; col < _drawingSurface.Width; col++)
{
*w++ = (byte)(heightBuffer[idx++] & 0xFF);
}
}
}
_heightMap.UnlockBits(bmd);
canvasHeight.Image = _heightMap;
}
else if (tabs.SelectedTab == tpShadowMap && _shadowMap == null)
{
_shadowMap = new Bitmap(_drawingSurface.Width, _drawingSurface.Height, PixelFormat.Format8bppIndexed);
// Create palette with index 0 blue, all others red
ColorPalette pal = _heightMap.Palette;
for (int i = 0; i <= 255; i++)
{
// create greyscale color table
pal.Entries[i] = i == 0 ? Color.Blue : Color.Red;
}
_shadowMap.Palette = pal; // re-setting activates palette
// Draw map
var bmd = _shadowMap.LockBits(new Rectangle(0, 0, _drawingSurface.Width, _drawingSurface.Height), ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
uint idx = 0;
unsafe {
for (int row = 0; row < _drawingSurface.Height; row++)
{
byte *w = (byte *)bmd.Scan0.ToPointer() + bmd.Stride * row;
for (int col = 0; col < _drawingSurface.Width; col++)
{
*w++ = (byte)(_drawingSurface.IsShadow(col, row) ? 1 : 0);
}
}
}
_shadowMap.UnlockBits(bmd);
canvasShadows.Image = _shadowMap;
}
}
