public bool[,] DrawLine(GraphicParams graphicParams)
{
var resultMatrix = GetEmptyMatrix(graphicParams.Height, graphicParams.Width);
DrawCosineLine(resultMatrix, graphicParams, 1);
DrawCosineLine(resultMatrix, graphicParams, -1);
return(resultMatrix);
}
private void RedrawGraphics()
{
var formHeight = ClientSize.Height;
var formWidth = ClientSize.Width;
var graphicsItem = CreateGraphics();
graphicsItem.Clear(Color.White);
Params = new GraphicParams(a, b, c, d, formHeight, formWidth);
DrawAxis(graphicsItem);
var resultMatrix = DrawingAlgorithm.DrawLine(Params);
DrawMatrix(graphicsItem, resultMatrix);
}
private static void DrawCosineLine(bool[,] resultMatrix, GraphicParams param, int dx)
{
var metric = param.GetMetric(dx < 1);
var pixX = param.XStart;
var stepDirection = param.Direction;
var xEnd = dx > 0 ? param.Width : 0;
var yEnd = 2 * param.PixPerYHalf - (param.YStart - param.Direction);
for (var pixY = param.YStart; dx *pixX < xEnd; pixY += stepDirection)
{
if (pixY == yEnd)
{
stepDirection = -stepDirection;
yEnd = param.Direction * stepDirection > 0 ? 2 * param.PixPerYHalf - (param.YStart - param.Direction) : param.YStart - param.Direction;
continue;
}
while (dx * pixX < xEnd)
{
resultMatrix[pixY, pixX] = true;
var x = (double)(pixX - param.XStart) / param.PixPerUnit - param.XOffset;
var nextX = (double)(pixX + dx - param.XStart) / param.PixPerUnit - param.XOffset;
var y = (double)(param.PixPerYHalf - pixY) / param.PixPerUnit;
var nextY = (double)(param.PixPerYHalf - pixY - stepDirection) / param.PixPerUnit;
var diagonal = metric(nextX, nextY);
var horizontal = metric(nextX, y);
var vertical = metric(x, nextY);
if (horizontal < vertical)
{
pixX += dx;
if (diagonal < horizontal)
{
break;
}
}
else
{
if (diagonal < vertical)
{
pixX += dx;
}
break;
}
}
}
}