蒙地卡羅求 PI 副本 | JavaScript 程式專案

{"id":41241,"student_id":3762,"content":"stopRendering();\npen.size = 0;\npen.fillColor = 'white';\npen.drawRect(0, 0, 640, 480);\n\nvar a = 0;\nvar b = 0;\nforever(function() {\n    for (var i = 0; i \u003c 1000; i++) {\n        var x = Math.floor(Math.random()*480);\n        var y = Math.floor(Math.random()*480);\n        var d = Math.sqrt((x - 240)*(x - 240) + (y - 240)*(y - 240));\n\n        pen.fillColor = 'red';\n        a++;\n\n        if (d \u003c 240) {\n            pen.fillColor = 'orange';\n            b++\n        }\n\n        pen.drawRect(x, y, 1, 1);\n    }\n\n    pen.fillColor = 'white';\n    pen.drawRect(0, 0, 200, 35);\n    print('PI: ' + b*4/a, 10, 10);\n})\n\n\n    // for(var i = 0; i \u003c 1000; i++) {\n    //     var x = Math.floor(Math.random()*480);\n    //     var y = Math.floor(Math.random()*480);\n\n    //     pen.fillColor = '#ff0000';\n    //     pen.drawRect(x, y, 5, 5);\n    // }\n\n\n    // var a = 0;\n    // var b = 0;\n\n    // forever(function(){ //function內的程式會一直被執行\n    //     for(var i=0; i\u003c1000; i++) {\n    //         var x = Math.floor(Math.random()*480);\n    //         var y = Math.floor(Math.random()*480);\n    //         var d = Math.sqrt((x - 240)*(x - 240) + (y - 240)*(y - 240)); //隨機產生的點距離中心點的距離\n\n    //         a++;\n    //         if (d \u003c 240) { //圓的半徑為240，所以小於240代表點點在園內\n    //             pen.fillColor = 'orange';\n    //             b++;\n    //         } else {\n    //             pen.fillColor = 'red';\n    //         }\n    //         pen.drawRect(x, y, 1, 1);\n    //     }\n\n    //     pen.fillColor = 'white';\n    //     pen.drawRect(0, 0, 200, 35);\n    //     print('PI: ' + b*4/a, 10, 10);\n    // });\n\n\n\n    // var centerX = 240;\n    // var centerY = 240;\n    // pen.fillColor = 'black';\n    // pen.drawRect(centerX, centerY, 5, 5);\n\n    // var x = Math.floor(Math.random()*480);\n    // var y = Math.floor(Math.random()*480);\n    // pen.fillColor = '#ff0000';\n    // pen.drawRect(x, y, 5, 5);\n\n    // console.log(Math.sqrt((x - 240)*(x - 240) + (y - 240)*(y - 240)));","created_at":"2018-09-08T00:26:48.021+08:00","updated_at":"2019-03-16T11:45:00.248+08:00","name":"蒙地卡羅求 PI 副本","language":"javascript","screenshot":{"url":"https://cdn4.koding.school/uploads/project/screenshot/41241/89edcce60b8890776f43b51e69f48ea4.jpg"},"parent_id":31606,"plugin":"","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":64,"hashid":"d5ms938d","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}