/// <summary>
/// Draw a line using Bresenhams line drawing algorithm.
/// </summary>
/// <remarks>
/// Bresenhams line drawing algoritm:
/// https://en.wikipedia.org/wiki/Bresenham's_line_algorithm
/// C# Implementation:
/// https://en.wikipedia.org/wiki/Bresenham's_line_algorithm
/// </remarks>
/// <param name="x0">Abscissa of the starting point of the line.</param>
/// <param name="y0">Ordinate of the starting point of the line</param>
/// <param name="x1">Abscissa of the end point of the line.</param>
/// <param name="y1">Ordinate of the end point of the line</param>
/// <param name="color">The color of the line.</param>
public void DrawLine(int x0, int y0, int x1, int y1, Color color)
{
_display.SetPenColor(color);
if (Stroke == 1)
{
DrawLine(x0, y0, x1, y1);
return;
}
if (IsTallerThanWide(x0, y0, x1, y1))
{
int xOffset = Stroke / 2;
for (int i = 0; i < Stroke; i++)
{
DrawLine(x0 - xOffset + i, y0, x1 - xOffset + i, y1);
}
}
else
{
int yOffset = Stroke / 2;
for (int i = 0; i < Stroke; i++)
{
DrawLine(x0, y0 - yOffset + i, x1, y1 - yOffset + i);
}
}
}
/// <summary>
/// Draw a line using Bresenhams line drawing algorithm.
/// </summary>
/// <remarks>
/// Bresenhams line drawing algoritm:
/// https://en.wikipedia.org/wiki/Bresenham's_line_algorithm
/// C# Implementation:
/// https://en.wikipedia.org/wiki/Bresenham's_line_algorithm
/// </remarks>
/// <param name="x0">Abscissa of the starting point of the line.</param>
/// <param name="y0">Ordinate of the starting point of the line</param>
/// <param name="x1">Abscissa of the end point of the line.</param>
/// <param name="y1">Ordinate of the end point of the line</param>
/// <param name="color">The color of the line.</param>
public void DrawLine(int x0, int y0, int x1, int y1, Color color)
{
_display.SetPenColor(color);
var steep = Math.Abs(y1 - y0) > Math.Abs(x1 - x0);
if (steep)
{
int t;
t = x0; // swap x0 and y0
x0 = y0;
y0 = t;
t = x1; // swap x1 and y1
x1 = y1;
y1 = t;
}
if (x0 > x1)
{
int t;
t = x0; // swap x0 and x1
x0 = x1;
x1 = t;
t = y0; // swap y0 and y1
y0 = y1;
y1 = t;
}
var dx = x1 - x0;
var dy = Math.Abs(y1 - y0);
var error = dx / 2;
var ystep = y0 < y1 ? 1 : -1;
var y = y0;
for (var x = x0; x <= x1; x++)
{
DrawPixel(steep ? y : x, steep ? x : y);
error = error - dy;
if (error < 0)
{
y += ystep;
error += dx;
}
}
}