|
public static Line ( |
||
| imageData | Source image data to draw on. | |
| point1 | IntPoint | The first point to connect. |
| point2 | IntPoint | The second point to connect. |
| color | Color | Line's color. |
| return | void | |
/// <summary>
/// Draws the line to a given image.
/// </summary>
///
/// <param name="image">The image where this Hough line should be drawn to.</param>
/// <param name="color">The color to be used when drawing the line.</param>
///
public void Draw(UnmanagedImage image, Color color)
{
// get line's radius and theta values
int r = this.Radius;
double t = this.Theta;
// check if line is in lower part of the image
if (r < 0)
{
t += 180;
r = -r;
}
// convert degrees to radians
t = (t / 180) * Math.PI;
// get image centers (all coordinate are measured relative to center)
int w2 = image.Width / 2;
int h2 = image.Height / 2;
double x0 = 0, x1 = 0, y0 = 0, y1 = 0;
if (this.Theta != 0)
{
// none-vertical line
x0 = -w2; // most left point
x1 = w2; // most right point
// calculate corresponding y values
y0 = (-Math.Cos(t) * x0 + r) / Math.Sin(t);
y1 = (-Math.Cos(t) * x1 + r) / Math.Sin(t);
}
else
{
// vertical line
x0 = this.Radius;
x1 = this.Radius;
y0 = h2;
y1 = -h2;
}
// draw line on the image
Drawing.Line(image,
new IntPoint((int)x0 + w2, h2 - (int)y0),
new IntPoint((int)x1 + w2, h2 - (int)y1),
Color.Red);
}
