pkgsrc/x11/xgas/DESCR

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Xgas, animated simulation of an ideal gas
Xgas is a physical simulation of an ideal gas in a heated box.
Gas molecules move around the box with velocities dependent on
their temperature. A chamber consisting of two boxes contains
the gas molecules collide with the walls, their temperature
approarches that of the box.
Use mouse button 1 to create molecules one at a time at
the cursor position. Use mouse button 2 to create the
maximum number of molecules at the cursor position.
Usage: xgas [ -options ]
Options:
-as Sets the autoStart resource.
-ts Sets the timeStepSize resource.
-d Sets the delay resource.
-rb Sets the randomBounce resource.
-eq Sets the equilibrium resource.
-mm Sets the maxMolecules resource.
-fg Sets the foreground.
-bg Sets the background.