/// <summary>
/// Renders a character on the display at the specified offset.
/// </summary>
/// <param name="display">The display to render to.</param>
/// <param name="character">The character to render.</param>
/// <param name="offsetX">The X-position of the left-most edge of the character.</param>
/// <param name="offsetY">The Y-position of the top-most edge of the character.</param>
public override void Render(ISenseHatDisplay display, SingleColorCharacter character, int offsetX, int offsetY)
{
int right = offsetX + character.Columns.Length - 1;
int bottom = offsetY + 7;
if ((offsetY > 7) || (bottom < 0) || (offsetX > 7) || (right < 0))
{
return;
}
int columnIndex = 0;
int maskInit = 1;
var pixelMap = new SingleColorCharacterRendererPixelMap
{
Character = character,
DisplayOffsetX = offsetX,
DisplayOffsetY = offsetY
};
int charPixelYInit = 0;
if (offsetX < 0)
{
columnIndex -= offsetX;
pixelMap.CharPixelX -= offsetX;
offsetX = 0;
}
if (offsetY < 0)
{
maskInit <<= -offsetY;
charPixelYInit -= offsetY;
offsetY = 0;
}
if (right > 7)
{
right = 7;
}
if (bottom > 7)
{
bottom = 7;
}
pixelMap.DisplayPixelX = 0;
for (int screenX = offsetX; screenX <= right; screenX++)
{
int mask = maskInit;
byte column = character.Columns[columnIndex++];
pixelMap.CharPixelY = charPixelYInit;
pixelMap.DisplayPixelY = 0;
for (int screenY = offsetY; screenY <= bottom; screenY++)
{
if ((column & mask) == mask)
{
display.Screen[screenX, screenY] = _getColor(pixelMap);
}
mask <<= 1;
pixelMap.CharPixelY++;
pixelMap.DisplayPixelY++;
}
pixelMap.CharPixelX++;
pixelMap.DisplayPixelX++;
}
}
private Color GetCharacterColor(SingleColorCharacterRendererPixelMap pixelMap)
{
switch (_currentMode)
{
case RenderMode.YellowOnBlue:
return Colors.Yellow;
case RenderMode.BlackOnStaticRainbow:
return Colors.Black;
case RenderMode.BlackOnMovingRainbow:
return Colors.Black;
case RenderMode.StaticRainbowOnBlack:
// Let the rainbow colors be "pinned" to the display.
return _rainbowColors[pixelMap.DisplayPixelX, pixelMap.DisplayPixelY];
case RenderMode.MovingRainbowOnBlack:
// Let the rainbow colors move with the characters ("restarting" on each character).
return _rainbowColors[pixelMap.CharPixelX, pixelMap.CharPixelY];
default:
throw new ArgumentOutOfRangeException();
}
}
