How do I move one co-ordinate to the other on X-Y Graph?

[allinson]

Hello Everyone,

Let's say first co-ordinate is (5, 5), I want to move this pixel on this X-Y graph to (10, 5); how can I do it?

I know that I need to increase it slowly by step of one towards the right on x-axis, but how can I do it with it showing every step and ending up at (10, 5)?

For example:

First Step

o   <----- pixel

Second Step

  o

Third Step

      o

etc..... till final step at (10, 5).

Thanks in advance for helping!

[GerdW]

Hi jqlee,

you just have to add 5 to its X coordinate, then plot again...

[pjr1121]

If you want to show the pixel moving, not just the start/end points.  you will have to utilize a loop where you add one each time (or a fraction for a smoother movement) and a wait timer to ensure enough time elapses for the user to view the change.

[ToeCutter]

x=xstart+frac*(xend-xstart)

y=ystart+frac*(yend-ystart)

frac=fraction of the way between start point and end point, 0->1.

frac=(current time-start stime)/(end time-start time)

loop over time in small increments.

[allinson]

Thanks everyone for helping!

I am able to reach the end point of my second co-ordinate, however now I wish it to move down the Y-axis after it reaches the end of second co-ordinate.

I used a case structure however it is giving me a hard time (also because I am unfamiliar with it).

Is there any simpler methods other than case structure? If not, how do I use it to continue the flow down the Y-axis please?

[GerdW]

Hi jqlee,

either use a (more general) state machine approach or some modulo math involving Quotient&Remainder...

[allinson]

Thanks for your reply, GerdW!

Let's say if I want to just allow the user to choose the four corners of a rectangle, and then for the pixel to show one at a time and end back at the initial point; should I use Enum, Boolean or Numerical case?

[GerdW]

Hi jqlee,

you don't need any case structure at all. You need an array of points and a FOR loop to iterate over the array...

[allinson]

REALLY?! If that is true, I will be so so happy!!!

I will building all four directions now and I will try your solution!

Thanks for your post!

[allinson]

Let's say for my .vi as shown below, what can I do for the "N" at the top left corner for the pixel to complete a round; repeating the cycle again and again if possible?

Thanks!