55 lines
1.4 KiB
Plaintext
55 lines
1.4 KiB
Plaintext
use std.process_bar;
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use std.os;
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use std.io;
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use std.math;
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var ppm = func(filename, width, height, RGB) {
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# P3 use ASCII number
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# P6 use binary character
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var fd = io.open(filename, "wb");
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io.write(fd, "P6\n"~width~" "~height~"\n255\n");
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for (var i = 0; i<height; i+=1) {
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for (var j = 0; j<width; j+=1) {
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io.write(fd, RGB(i, j));
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}
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}
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io.close(fd);
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}
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var width = 1920 * 2;
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var height = 1080 * 2;
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var bar = (os.platform()=="windows")?
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process_bar.bar(front:"sharp", back:"point", sep:"line", length:50):
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process_bar.high_resolution_bar(50);
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var abs = math.abs; # alias
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var RGB = func(h, w) {
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var r = 2+w*2/width;
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var x = (height-h)/height;
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var (R, G, B) = (0, 0, 0);
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var tmp = 0.5;
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for (var i = 0; i<50; i+=1) {
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tmp = r*tmp*(1-tmp);
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}
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for (var i = 0; i<150; i+=1) {
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tmp = r*tmp*(1-tmp);
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if (abs(tmp-x)<0.0005) {
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R = int(255*(150 - i)/150);
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G = int(255*(150 - i)/150);
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B = 255;
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break;
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}
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}
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var progress = (h*width+w+1)/(width*height);
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if (progress*100-int(progress*100)==0) {
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print(bar.bar(progress), " ", progress*100, "% \r");
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}
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return char(R) ~ char(G) ~ char(B);
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}
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ppm("feigenbaum.ppm", width, height, RGB);
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println(); |