public static Bitmap Midpoint(Bitmap img, int x1, int y1, int x2, int y2, Color cor)
{
Bitmap btm = new Bitmap(img);
double cx = x1;
double cy = y1;
double rx = Math.Abs(x2 - x1);
double ry = Math.Abs(y2 - y1);
double x = 0;
double y = ry;
double d1 = Math.Pow(ry, 2) - Math.Pow(rx, 2) * ry + Math.Pow(rx, 2) / 4;
double dx = 2 * Math.Pow(ry, 2) * x;
double dy = 2 * Math.Pow(rx, 2) * y;
while (dx < dy)
{
DrawEllipse.Draw(btm, (int)Math.Round(x), (int)Math.Round(y), (int)Math.Round(cx), (int)Math.Round(cy), cor);
if (d1 < 0)
{
x++;
dx += 2 * Math.Pow(ry, 2);
d1 += dx + Math.Pow(ry, 2);
}
else
{
x++;
y--;
dx += 2 * Math.Pow(ry, 2);
dy -= 2 * Math.Pow(rx, 2);
d1 += dx - dy + Math.Pow(ry, 2);
}
}
double d2 = (Math.Pow(ry, 2) * ((x + 0.5) * (x + 0.5)))
+ (Math.Pow(rx, 2) * ((y - 1) * (y - 1)))
- Math.Pow(rx, 2) * Math.Pow(ry, 2);
while (y >= 0)
{
DrawEllipse.Draw(btm, (int)Math.Round(x), (int)Math.Round(y), (int)Math.Round(cx), (int)Math.Round(cy), cor);
if (d2 > 0)
{
y--;
dy -= 2 * Math.Pow(rx, 2);
d2 += Math.Pow(rx, 2) - dy;
}
else
{
y--;
x++;
dx += 2 * Math.Pow(ry, 2);
dy -= 2 * Math.Pow(rx, 2);
d2 += dx - dy + Math.Pow(rx, 2);
}
}
return(btm);
}
private void picBox_MouseMove(object sender, MouseEventArgs e)
{
if (picBox.Image != null)
{
toolTip.SetToolTip(picBox, "X:" + e.X + " Y:" + e.Y);
}
if (polyflag == true && polyfirst == false)
{
picBox.Image = DrawLine.DDA((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
}
else
{
if (flag == true && picBox.Image != null && polyflag == false)
{
switch (this.Active)
{
case "Equação Real da Reta":
picBox.Image = DrawLine.RealLine((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
break;
case "DDA":
picBox.Image = DrawLine.DDA((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
break;
case "Bresenham":
picBox.Image = DrawLine.Bresenham((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
break;
case "Trigonometria":
picBox.Image = DrawCircle.Trigonometry((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
break;
case "Ponto Médio":
picBox.Image = DrawCircle.Midpoint((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
break;
case "Ponto Médio Elipse":
picBox.Image = DrawEllipse.Midpoint((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
break;
default:
picBox.Image = DrawCircle.RealCircle((Bitmap)img, point.X, point.Y, e.X, e.Y, Color.Black);
break;
}
}
}
}
