- Posted by Admin on February 9, 2009
There is no direct function available to draw line on the asp.net web form. Hence, we need to find the pixels of the line points and then drawing them on the bitmap objects. Here is the sample code that find the line points and sets them on the bitmap supplied in the argument.
public void
lineSimple(int x0, int
y0, int x1, int
y1, System.Drawing.Color color, ref
System.Drawing.Bitmap raster)
{
int dx
= x1 - x0;
int dy
= y1 - y0;
raster.SetPixel(x0, y0, color);
if (dx
!= 0)
{
float
m = (float)dy / (float)dx;
float
b = y0 - m * x0;
dx = (x1 > x0) ? 1 : -1;
while
(x0 != x1)
{
x0 += dx;
y0 = Convert.ToInt32(Math.Round(m
* x0 + b));
for
(int i = 0; i <= 5; i++) // loops to change the thickness of the line
{
for
(int j = 0; j <= 6; j++)
{
raster.SetPixel(x0 + i,
y0 + j, color);
}
}
}
}
}
I needed to develop this code because I needed to prepare my own line chart component. It is working without any problem.