I am trying to write a simple code in Fortran OpenGl to animate the dynamics of a linear polymer.On a square lattice, initially a linear polymer is a horizontal sequence of successive top-left and top-right bonds. Equivalently, this is a series of up and down kinks. The biased dynamics is a sequence of moves of down ->> up kinks, the down kinks are selected at random and with uniform probabilities. To animate this I need to erase two bonds of the down kink and then draw two bonds of the up kink. The "erasing" a bond is executed by "drawing" another bond on top of it using the background colour. The problem is when I run my code for a certain duration of Monte Carlo time, it is giving me the correct picture of the final configuration of the polymer at the end of the simulation, but not showing the sequence of intermediate microscopic moves of kink flipping. I guess, I must be missing one or more graphic commands. I can send the code if anybody tries to help. Finally, I am working in the Linux (Ubuntu) environment.
Are you sure your screen is getting refreshed? From own code using Delphi, I remember that this sometimes was an issue, even though I redraw the frame I want to show, the program does not always refresh what is shown on screen at those points but waits for a later moment. Maybe you are observing the same thing. If so, check if there is a command in openGL to force the refresh. (a similar issue could be thread related: all the refreshes happen nearly instantaneously when the calculations are done).
If the option exists to print your image to a picture (png/bmp/...) maybe you should add this, just to check if all frames are correctly generated, if so the problem may be one of those I stated above)
(ps I would be interested to see the code, just to see how to work with openGL in fortran.)
Dear danny: Thank you very much. I think you have got it right. Only yesterday evening I could do it right, with the help of one of our sysadmins. he inserted one refresh command. I would be happy to share the code with you. Please send me a test e-mail at [email protected]
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