Graphicspath curve point count multiplying

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Hi,
When I add a curve with an array of points the point are multiplied.

Dim Temp_Pts_Orig23 As New List(Of PointF)

For Each Move In Code_stripped
Dim Temp_Point23 As Point3D = New Point3D(0, 0, 0)
Temp_Point23 = New Point3D(Move.X_point, Move.Y_point, Move.Z_point)
Temp_Point23 = Temp_Point23.RotateX(X_Rotate).RotateY(Y_Rotate).RotateZ(Z_Rotate)

Next
Colour_Path.AddCurve(Temp_Pts_Orig23.ToArray()) 'Array of 32 points

But when array count is done after there are 93.
Many Thanks

What I have tried:

This only happens on curve and not on addlines. I have tried flattern to get the 32 points (approx) but this will mess up all the other arrays which are working in tandem.

Also tried :-

Colour_Path.AddCurve(Temp_Pts_Orig23.ToArray(), 0.0F, Temp_Pts_Orig23.Count - 1, 1.0F)

Is there a way of stopping this & give me what I need?

Posted 7-Aug-17 21:47pm

Knight school

Updated 9-Aug-17 23:09pm

v3

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Comments

Ralf Meier 8-Aug-17 6:02am

What is 'Temp_Pts_Orig23' as kind of type and what is the content of it ?

Knight school 9-Aug-17 3:40am

Sorry I should of added more detail.

Dim Temp_Pts_Orig23 As New List(Of PointF)

Ralf Meier 10-Aug-17 2:57am

Sorry ... that doesn't help me much ... Show the complete code of your method (use 'Improve question' to add it) and tell when this method is called ...

Ralf Meier 10-Aug-17 5:42am

OK ... I will be a little more specific :
I have seen that you added a code-snippet to your question.

You created a new type Point3D which has a X,Y and Z-value. 'Temp_Pts_Orig23' has the type PointF which has only a X and a Y-value.
So how are those 3D-Coordinates translated to a 2D-Coordinate ?
Give a sample of the Content of your List(of PointF) - whatever this list contains will be directly (without any multiplyings) converted into an Array with the ToArray-method.

Please remember : what you are doing is completly abstract for me - I can't see what you see and I can't read in your mind ... so you should give a little help if you want some help ...

Knight school 10-Aug-17 6:06am

Hi,
The Point3D converts X,Y,Z points to 2D points so it can displayed on screen. Which works very well & the point count is OK (32 points in & 32 points out). The problem really lies when add the array to the graphicspath (add curve only). I add 32 points & when I do graphicspath data point count it is 93. So when I want to use a tandem array with other info which is no points (color etc.)the counts get out of sync.

I hope this helps understand the problem I am having.

Ralf Meier 10-Aug-17 6:25am

At first : if you press the 'Reply'-Button to my comment I get a Notification - if you only write a new comment I get none ... :(

to your question :
If your List is calculated well and the Array contains the right count of Points the GraphicsPath should also contain those Points ... but if you call this method twice or more all those Points will be added again and again to the GraphicsPath. Could it happen like this ?
If you don't want it you should create a NEW GraphicsPath before you add the Curve-data to it.
Thats the reason why I asked you for the code of the (this) method and when the method is called (you don't answered it).

Knight school 10-Aug-17 7:45am

Sorry for not being clearer in explanation.

The array is not running in more than once that I can see.

The method (For each) is called as Array of deciphered text into individual data of which this method cycles through & gives me list of points (which are points on a 3D curve). The cycle is then converted to 2D points to draw on screen(which can also be rotated in 3D (mouse move with left click).

The reason for having individual graphicspaths they can traced back to the original code position.

I hope this helps (I am not used to using a forum as I normally find an answer in the net but after searching for days no one seems to of come across this problem)

Ralf Meier 10-Aug-17 7:56am

I'm sorry that I can't directly Point you to the Solution ... :(
I understand what you want to have - independant if you want to trace back the GraphicsPath - it should only contain those elements which are necessary.
Have you had a look with the Debugger and a Breakpoint to your code ? What makes you so sure that this code really is called only once ? Normally .Net-Controls run their OnPaint-method severall times and with each change in the Properties which cause an Invalidate.
What is the Content of your GrphicsPath ? Does the content of your Array is repeated 2 or 3 times ...?

Knight school 10-Aug-17 8:05am

I have added a count in the points to see if it adding the point more than once but it always comes back once.

I have tried
Colour_Path.AddCurve(Temp_Pts_Orig23.ToArray(), 0.0F, Temp_Pts_Orig23.Count - 1, 1.0F)

Which sets segments to the array count but always more points.

Knight school 10-Aug-17 8:38am

I have added a workaround by have 2 graphicspath (1 for draw -point count not important & 1 for point count & point positions which I have used a addlines which the point stay the same.

twice the amount of work but it does not slow down process.

I still would know why the extra points for the future?

Ralf Meier 10-Aug-17 9:24am

I'm sorry ... now I have tested it by myself. I couldn't imagine that this is an mistake of the Framework ...
What happens is that for each Point out of your Points-Array 3 Points were inserted into the GraphicsPath by the AddCurve-Method. I think this Comes from the Spline-Function of this method (but that doesn't correspond with the Point-Values ...).
I also didn't find a way to stop this 'feature'.
So my only Suggestion could be : work with Addines (as you wrote in your question) to be sure that the number of Points in the GraphicsPath are matching to the Points which are really existant.
Again sorry for my comments before ... which leaded into the wrong direction ...

But ... to your question again : why didn't you want to use AddLines ? Did you need a kind of rounding of the Curve-data ?

Knight school 10-Aug-17 9:36am

I need the curve to accurate as possible & not faceted but the points are for animation purposes. Points will not be a issue (Simple framerate) & will be equally spaced but the extra points added are not (maybe as you said just points on the spline).

The workaround seems to work without much processing power.

Thanks
For you time.

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