public void Draw(ICanvas <TPixelData> canvas, Point start, Point end, IPixel <TPixelData> colour)
{
_logger.LogDebug($"[DrawRectangle] start: {start}, end: {end}, colour: {colour}");
Guard.ThrowIfNull(canvas, nameof(canvas));
Guard.ThrowIfNull(colour, nameof(colour));
canvas.ValidatePointWithinCanvas(start);
canvas.ValidatePointWithinCanvas(end);
var corners = new[]
{
start,
new Point(start.X, end.Y),
end,
new Point(end.X, start.Y)
};
DrawSide(0, 1);
DrawSide(1, 2);
DrawSide(2, 3);
DrawSide(3, 0);
void DrawSide(int cornerIndex1, int cornerIndex2)
{
_drawStraightLine.Draw(canvas, corners[cornerIndex1], corners[cornerIndex2], colour);
}
}
public void Draw_NullCanvas_ThrowsValidationException()
{
Assert.ThrowsException <ArgumentNullException>(() =>
_subject.Draw(null, new Point(1, 1), new Point(1, 1), new PixelStub()));
}
