Calling a method to draw parallel lines

This question is a followup to the last one.

I followed RobH's advice and his edge case bug found in my code with this solution:

private Line CreateParallelLine(Line target, int offset)
{
    var parallelLine = new Line();
    var xDifference = target.point1.x - target.point2.x;
    var yDifference = target.point1.y - target.point2.y;
    var length = Math.Sqrt(Math.Pow(xDifference, 2) + Math.Pow(yDifference, 2));

    parallelLine.point1.x = (float)(target.point1.x - offset * yDifference/length);
    parallelLine.point2.x = (float)(target.point2.x - offset * yDifference/length);
    parallelLine.point1.y = (float)(target.point1.y + offset * xDifference/length);
    parallelLine.point2.y = (float)(target.point2.y + offset * xDifference/length);

    return parallelLine;
}

Now, since his solution only provided a means of creating one parallel line, even though I need to draw several lines, I have this method that draws the parallel lines (it works) but it is long and there is repeat code:

```
private void DrawParallelLines(object sender, LineDrawingEventArgs e)
{
Line referenceLine = CameraObject.GetComponent().GetLineParams(ViewType + StickLocationEnum.ToString() + linename);
Line ParallelLine1 = CameraObject.GetComponent().CreateParallelLine(referenceLine, 50);
Line ParallelLine2 = CameraObject.GetComponent().CreateParallelLine(referenceLine, -50);
Line ParallelLine3 = CameraObject.GetComponent().CreateParallelLine(referenceLine, 100);
Line ParallelLine4 = CameraObject.GetComponent().CreateParallelLine(referenceLine, -100);

LineParams paramForParallelLine = new LineParams(ViewType + "ParallelLine", Color.green, Color.green, EndPointType.Circle, EndPointType.Circle, lineThickness, endPointThickness);
Line parallellineWithParams1 = new Line(ParallelLine1.point1, ParallelLine1.point2, paramForParallelLine, ElementType.Line);
Line parallellineWithParams2 = new Line(ParallelLine2.point1,

How would you handle 300 parallel lines?

Line ParallelLine1 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, 50);
    Line ParallelLine2 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, -50);
    Line ParallelLine3 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, 100);
    Line ParallelLine4 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, -100);
    ...
    Line ParallelLine297 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, 950);
    Line ParallelLine298 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, -950);
    Line ParallelLine299 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, 1000);
    Line ParallelLine300 = CameraObject.GetComponent()
                                     .CreateParallelLine(referenceLine, -1000);

Something's not right isn't it?

I think you need to put words on the concepts involved here:

• You have a bunch of lines.

• Lines are drawn in pairs.

• Lines are offset from the referenceLine by a fixed interval - one line with a positive offset, the other with a negative offset.

You need to write a method that can create n lines and return an IEnumerable given:

• A referenceLine.

• An offsetIncrement for the offset.

• The n number of pairs of lines you want to create.

• A LineParams instance.

And then you can just iterate the result and write the AddNewLine() call only once.

StackExchange Code Review Q#91417, answer score: 4