Matrix digital rain: Difference between revisions
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→{{header|J}}: describe things a bit better
m (J: exponential decay (slightly non-linear) for phosphor glow) |
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This implementation was written for jqt under j903, after studying https://youtu.be/MvEXkd3O2ow
Some key issues are the (deliberate) relatively low resolution of the screen in the movie, a somewhat slow update rate and some variation over time in the update rate of the screen. This implementation is, of course, only an approximation...
<lang J>require'ide/qt/gl2'
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<tt>timer 100</tt> to roughly match the update rate used in the matrix movie.
In the movie, the display was somewhat pixelated, and had some other artifacts which were characteristic of cathode display tubes. The font support we use here does not emulate all of that.
Conceptually, we are emulating an emulation of a cathode ray tube with a long phosphor persistence time. Thus, there's an initial "burst" of light when the phosphor is being painted followed by a lingering glow which gradually fades out. Here, we use a <span style="background-color: black; color: #e0ffff"> light cyan </span> to represent the initial paint event and <span style="color: #00ff00">f</span><span style="color: #00ec00">a</span><span style="color: #00da00">d</span><span style="color: #00c900">i</span><span style="color: #00b900">n</span><span style="color: #00aa00">g</span><span style="color: #009b00"> </span><span style="color: #008d00">s</span><span style="color: #007f00">h</span><span style="color: #007200">a</span><span style="color: #006600">d</span><span style="color: #005b00">e</span><span style="color: #004f00">s</span><span style="color: #004500"> </span><span style="color: #003b00">o</span><span style="color: #003100">f</span><span style="color: #002800"> </span><span style="color: #001f00">g</span><span style="color: #001700">r</span><span style="color: #000f00">e</span><span style="color: #000700">e</span><span style="color: #000000">n</span> to represent the fading phosphors. To better approximate the phosphor persistence mechanism, we have intensity fall off exponentially (and then we adjust the numeric range of the result so it still fades from our brightest green to black).
=={{header|Javascript}}==
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