{"id":3122,"date":"2017-08-24T00:40:02","date_gmt":"2017-08-23T21:40:02","guid":{"rendered":"http:\/\/java.mazurok.com\/?p=3122"},"modified":"2017-11-28T02:16:48","modified_gmt":"2017-11-27T23:16:48","slug":"%d0%ba%d0%bb%d0%b0%d1%81%d1%81-%d0%b4%d0%bb%d1%8f-%d1%80%d0%b0%d0%b1%d0%be%d1%82%d1%8b-%d1%81-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%b8%d0%bc%d0%b8-%d0%b2%d0%b5","status":"publish","type":"post","link":"https:\/\/java.mazurok.com\/?p=3122","title":{"rendered":"\u041a\u043b\u0430\u0441\u0441 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u0438 \u0432\u0435\u043a\u0442\u043e\u0440\u0430\u043c\u0438 \u043d\u0430 \u043f\u043b\u043e\u0441\u043a\u043e\u0441\u0442\u0438"},"content":{"rendered":"

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$latex x_1$<\/td>\n$latex y_1$<\/td>\n$latex x_2$<\/td>\n$latex y_2$<\/td>\n$latex x_3$<\/td>\n$latex y_3$<\/td>\n$latex x_4$<\/td>\n$latex y_4$<\/td>\n\u0421\u043a. \u043f\u0440.<\/td>\n\u0423\u0433\u043e\u043b<\/td>\n<\/tr>\n
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 <\/p>\n

import java.util.*;\r\nimport java.lang.Math.*;\r\nimport java.io.*;\r\n \r\nclass geomVector\r\n{\r\n\tpublic double x1,x2,y1,y2,xV,yV,xM,yM,vL;\r\n\tpublic void setVector(double a1,double b1, double a2, double b2)\r\n\t{\r\n\t\tx1 = a1;\r\n\t\tx2 = a2;\r\n\t\ty1 = b1;\r\n\t\ty2 = b2;\r\n\t}\r\n\tpublic void getVectorCoords()\r\n\t{\r\n\t\txV = x2 - x1;\r\n\t\tyV = y2 - y1;\r\n\t}\r\n\tpublic void getMiddleCoords()\r\n\t{\r\n\t\tgetVectorCoords();\r\n\t\txM = xV\/2;\r\n\t\tyM = yV\/2;\r\n\t}\r\n\tpublic void multiplyVector(double a)\r\n\t{\r\n\t\tx1*=a;\r\n\t\tx2*=a;\r\n\t\ty1*=a;\r\n\t\ty2*=a;\r\n\t\tgetVectorCoords();\r\n\t\tgetMiddleCoords();\r\n\t}\r\n\tpublic double getLength()\r\n\t{\r\n\t\treturn vL = Math.sqrt(xV*xV+yV*yV);\r\n\t}\r\n\tpublic void vectorSum(geomVector a,geomVector b)\r\n\t{\r\n\t\ta.setVector(a.x1,a.y1,b.x2,b.y2);\r\n\t}\r\n\tpublic double scalMult(geomVector a,geomVector b)\r\n\t{\r\n\t\treturn (a.xV*b.xV+a.yV*b.yV);\r\n\t}\r\n\tpublic double getAngle(geomVector a, geomVector b)\r\n\t{\r\n\t\treturn Math.acos(scalMult(a,b)\/(a.getLength()*b.getLength()));\r\n\t}\r\n}\r\n \r\npublic class Main {\r\n\tpublic static void main(String[] args)\r\n\t{\r\n\t\tdouble x1,x2,x3,x4,y1,y2,y3,y4;\r\n\t\tScanner in = new Scanner(System.in);\r\n\t\tx1 = in.nextDouble();\r\n\t\tx2 = in.nextDouble();\r\n\t\tx3 = in.nextDouble();\r\n\t\tx4 = in.nextDouble();\r\n\t\ty1 = in.nextDouble();\r\n\t\ty2 = in.nextDouble();\r\n\t\ty3 = in.nextDouble();\r\n\t\ty4 = in.nextDouble();\r\n\t\tgeomVector a = new geomVector();\r\n\t\tgeomVector b = new geomVector();\r\n\t\ta.setVector(x1,y1,x2,y2);\r\n\t\tb.setVector(x3,y3,x4,y4);\r\n\t\ta.getVectorCoords();\r\n\t\tb.getVectorCoords();\r\n\t\tSystem.out.println(b.scalMult(b,a));\r\n\t\tSystem.out.println(a.getAngle(a,b));\r\n\t}\r\n}<\/pre>\n
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