Mandelbrot Set | JavaScript 程式專案

{"id":8556,"student_id":70,"content":"setBackdrop(\"black\");\n\nstopRendering();\n\nvar zoom = 200;\nvar panX = 0.5,\n    panY = 0;\nvar maxIterations = 80;\nvar pointsList = [];\nvar pen = Game.pen;\n\nfunction generateSet(maxIterations) {\n    pointsList = [];\n    for (var x = 0; x \u003c 640; x++) {\n        for (var y = 0; y \u003c 480; y++) {\n            var c = {\n                Re: (x - 320) / zoom - panX,\n                Im: (y - 240) / zoom - panY\n            };\n            var z = f(c, c);\n            for (var i = 0; i \u003c maxIterations; i++) {\n                var z_Prime = f(z, c);\n                z = z_Prime;\n                if (abs(z) \u003e= 2) {\n                    pen.color = 'hsl(170, 100%, ' + (i / maxIterations) * 100 + '%)';\n                    pen.drawRect(x, y, 1, 1);\n                    break;\n                }\n            }\n        }\n    }\n}\n\nfunction f(z, c) {\n    var z_prime = {\n        Re: Math.pow(z.Re, 2) - Math.pow(z.Im, 2) + c.Re,\n        Im: 2 * z.Re * z.Im + c.Im\n    }\n    return z_prime;\n}\n\nfunction abs(z) {\n    return Math.sqrt(Math.pow(z.Re, 2) + Math.pow(z.Im, 2));\n}\n\ndrawBackdrop(\"black\");\nvar startTime = new Date();\ngenerateSet(maxIterations);\nconsole.log(\"Drawing time: \"+ ((new Date())-startTime) + \"ms\");  \npen.draw(); ","created_at":"2017-03-01T20:52:04.729+08:00","updated_at":"2019-10-30T10:07:01.175+08:00","name":"Mandelbrot Set","language":"javascript","screenshot":{"url":"https://cdn8.koding.school/uploads/project/screenshot/8556/f95bd94038439c46bcbb842e6b818ba8.jpg"},"parent_id":8205,"plugin":"","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":357,"hashid":"zpes9kg","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}