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I would start by replacing your 'tweeked' numbers with a call to:
RGB@(RED,GREEN,BLUE)
Where RED, GREEN, and BLUE are integers in the range 0 to 255.

eg RGB@(255,0,0) generates RED.

Thank you, that works well.

Sample code for those who like to experiment.

module data_mod
implicit none
integer, parameter :: dp=kind(1.d0)
real(kind=dp) :: ...

This post caught my attention and I wondered if clearwin_info@('CURRENT_CONTROL') could be used to avoid having a separate call back for every %pl for a window with multiple %pl regions.

Yes it can ...

Thanks Paul, Eddie, and John for the suggestions. I had originally thought about a zoom function – but decided it was too hard – but it’s back on the too do list. Unfortunately I will have to revisi ...

A little more progress was made today:-

https://www.youtube.com/watch?v=yqUAYXo8itM

Thanks Paul,

Another one for you to consider. This compiles with no errors, which I think is wrong since mod_b should have no access to the definition of z_t.

module a_mod
implicit none

ty ...

Is this a bug? Should the private declaration in the header of the module def, prevent the main program from finding the definition of the type test_t?

module def
implicit none

private

ty ...

Progress to date:-

https://www.youtube.com/watch?v=tM2F2NNaHxY

Thanks to those who emailed and messaged me with suggestions.

Thanks Paul,

I've not used child windows before so I am on a learning curve, and experimenting.

For the long dark winter nights I have tasked myself with developing a schematic capture applicat ...

John,

The first example generates the following. A quarter of the image area is displayed (0.5 x 0.5 = 0.25)

http://www.tr5mx.co.uk/chex1.jpg

The second example draws the whole image:-

ht ...

I have modified one of the examples in the documentation to convince myself that its possible to scroll over a graphics area embedded in a child with scroll bars:

program main
implicit none
inclu ...

Thanks Paul, I forgot about that example. Modified your example to demonstrate issue as below, and uncommenting the call to set_graphics_selection@ the problem goes away. Very Happy

Ken

program ...

Below is a link to a simple drawing program which behaves as expected, drawing lines, circles, rectangles etc.

http://www.tr5mx.co.uk/canvas2.f95

If the %gr options smooth4 or smooth8 are includ ...

You could use %pl to set up the x and y coordinates. Then since %pl is a graphics region you can simply draw your contour lines on the drawing surface via a call back function. I've got this to work ...

Thanks Paul, Problem fixed Smile

I was sure I had read some where that these were to be kind=7. Corrected code below for those who wish to experiment.
module data_mod
implicit none
integer, par ...