碎形 | JavaScript 程式專案

{"id":11558,"student_id":97,"content":"setBackdrop(\"#ffffff\");\n\nforever(function(){\n    stop();\n});\n\nvar pen = pen;\npen.color = \"black\";\npen.size = 2;\n\nfunction drawSideShape(x1,y1,x2,y2,sideShapeN){\n    \n\n    var len = Math.sqrt( (x2-x1)**2 + (y2-y1)**2 );\n    var nowAngle = Math.PI;\n        nowAngle += Math.atan((y2-y1)/(x2-x1));\n        if(x2 \u003c x1)nowAngle += Math.PI;\n    var angleStop = Math.PI*2/sideShapeN;\n    var startX = x1,startY = y1;\n    var endX = null,endY = null;\n\n    var posSaves = [\n        {x:x1,y:y1}\n    ];\n    for(var i=0 ; i\u003csideShapeN-1 ; i++){\n        nowAngle -= angleStop;\n        endX = startX +      len*Math.cos( nowAngle );\n        endY = startY +      len*Math.sin( nowAngle );\n        pen.drawLine(startX,startY,endX,endY);\n\n        startX = endX;\n        startY = endY;\n        posSaves.push({\n            x: startX,\n            y: startY\n        });\n    }\n    return posSaves;\n}\nfunction draw(x1,y1,x2,y2,layer,finalLayer,sideShapeN){\n    if(layer \u003e finalLayer)return;\n\n    var midX1 = x1+ (x2-x1)  /3;\n    var midY1 = y1+ (y2-y1)  /3;\n    var midX2 = x1+ (x2-x1)*2/3;\n    var midY2 = y1+ (y2-y1)*2/3;\n    pen.drawLine(x1, y1,midX1,midY1);\n    var posSaves = drawSideShape(midX1,midY1,midX2,midY2,sideShapeN);\n    pen.drawLine(midX2, midY2,x2,y2);\n\n    draw(x1,y1,midX1,midY1,layer+1,finalLayer,sideShapeN);\n    for(var i=1 ; i\u003cposSaves.length ; i++){\n        var startPos = posSaves[i-1];\n        var endPos = posSaves[i];\n        draw(startPos.x,startPos.y,endPos.x,endPos.y,layer+1,finalLayer,sideShapeN);\n    }\n    draw(midX2,midY2,x2,y2,layer+1,finalLayer,sideShapeN);\n}\n\nvar sideShapeN = prompt(\"你想要看幾邊形\");\nvar finalLayer = prompt(\"要畫幾層 (建議五層內)\");\ndraw(0,100,640,100,1,finalLayer,sideShapeN);\n\n\n","created_at":"2017-03-01T20:52:04.729+08:00","updated_at":"2019-10-09T05:18:30.395+08:00","name":"碎形","language":"javascript","screenshot":{"url":"https://cdn3.koding.school/uploads/project/screenshot/11558/61314aae97360005f952d150f19822b2.jpg"},"parent_id":2,"plugin":"","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":243,"hashid":"wdks4pmz","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}