PhonicsGame_master/pages/main/print.js

import common from '../../utils/util';
import server from '../../utils/main';

const app = getApp();
var QuestionList = [];
var isAndroid = false;

Page({
  data: {
    Left: 0,
  },
  onLoad: function (options) {
    var id = options.id;
    id = 183;
    var QuestionTypeCategory=3;
    this.getList(id, QuestionTypeCategory);

    isAndroid = false;
    if (app.globalData.systemInfo.system && app.globalData.systemInfo.system.indexOf("Android") >= 0)
      isAndroid = true;

  },
  getList: function (id, QuestionTypeCategory) {
    var that = this;

    server.getLocalHost(function () {
      server.getData('GetQuestionTypesPrint?QuestionTypeCategory=' + QuestionTypeCategory+'&ID=' + id, function (data) {
        //console.log("UserInfo:" + data);
        if (data) {
          //var data=wx.getStorageSync("TestPrint");
          QuestionList = data;
          var ctx = wx.createCanvasContext("Canvas", that);
          ctx.setFillStyle('white');
          ctx.fillRect(0, 0, 1050, 1485);
          ctx.draw(true, function (n) {
            wx.canvasToTempFilePath({
              x: 0,
              y: 0,
              width: 2100,
              height: 2970,
              destWidth: 2100,
              destHeight: 2970,
              canvasId: 'Canvas',
              success: function (res2) {
                console.log(res2.tempFilePath);
                that.saveImage();
              }
            })
          });
        }
      });

    });
  },
  saveImage: function () {
    var item = QuestionList;

    var that = this;
    var ctx = wx.createCanvasContext("Canvas", that);
    ctx.setFillStyle('white');
    //ctx.fillRect(0, 0, 1050, 1485);
    ctx.fillRect(0, 0, 1050, 1485);
    ctx.fillStyle = "#000000";

    //计算数组最大长度
    var maxLength = 0;
    for (var l = 0; l < item.QuestionList.length; l++) {
      var num1 = item.QuestionList[l];
      if (num1.Vertical) {
        for (var n = 0; n < num1.Vertical.length; n++) {
          if (maxLength < num1.Vertical[n].Array.length)
            maxLength = num1.Vertical[n].Array.length;
        }
      }
    }

    var xStart = 60;
    var yStart = 247;

    var height = 150;
    if (item.QuestionTypeCategory == 2)
      height = 59;
    if (item.PageCount == 18)
      height = 210;
    else if (item.PageCount == 15)
      height = 250;
    //括号
    var index = 0;
    ctx.setFontSize(12);
    for (var i = 0; i < 3; i++) {
      for (var j = 0; j < item.PageCount / 3; j++) {
        index++;
        ctx.fillText("(", xStart + i * 310, yStart + j * height);
        ctx.fillText(")", xStart + i * 310 + 22, yStart + j * height);
      }
    }

    //编号
    index = 0;
    ctx.setTextAlign('center');
    var numberLeft = 12;
    if (isAndroid)
      numberLeft = 14;
    for (var i = 0; i < 3; i++) {
      for (var j = 0; j < item.PageCount / 3; j++) {
        index++;
        ctx.fillText(index, xStart + i * 310 + numberLeft, yStart + j * height);
      }
    }

    //算式
    index = 0;
    ctx.setFontSize(24);
    for (var i = 0; i < 3; i++) {
      for (var j = 0; j < item.PageCount / 3; j++) {
        index++;

        //横式
        if (item.QuestionTypeCategory == 2) {

          var A = item.QuestionList[index - 1].A.toString();
          if (item.QuestionList[index - 1].HiddenColumn == "A")
            A = "____";
          var OperateAB = item.QuestionList[index - 1].OperateAB.toString();
          console.log(OperateAB);
          var B = item.QuestionList[index - 1].B.toString();
          if (item.QuestionList[index - 1].HiddenColumn == "B")
            B = "____";
          var equation = A + " " + OperateAB + " " + B;
          if (item.QuestionList[index - 1].C) {
            var OperateBC = item.QuestionList[index - 1].OperateBC.toString();
            var C = item.QuestionList[index - 1].C.toString();
            equation += " " + OperateBC + " " + C;
            if (item.QuestionList[index - 1].D) {
              var OperateCD = item.QuestionList[index - 1].OperateCD.toString();
              var D = item.QuestionList[index - 1].D.toString();
              equation += " " + OperateCD + " " + D;
            }
          }
          equation += " = ";
          var R = item.QuestionList[index - 1].R.toString();
          if (item.QuestionList[index - 1].HiddenColumn == "R")
            R = "";
          equation += R;

          var num = xStart + i * 310 + 31;
          
          for (var n = 0; n < equation.length; n++) {
            var len = getLength(equation[n]);
            num += len;
            if (equation[n] == ".") {
              ctx.fillText(equation[n], num + 3, yStart + j * 59);
            } else {
              var h = 0;
              if (equation[n] == "_")
                h = 8;
              ctx.fillText(equation[n], num, yStart + j * 59 + h);
            }
          }
        }
        //竖式
        else if (item.QuestionTypeCategory == 3) {

          var num1 = item.QuestionList[index - 1];
          var isAnswer = false;

          var width = 250;
          if (num1.OperateAB == "÷")
            width=240;

          //console.log(num1);
          for (var n = 0; n < num1.Vertical.length; n++) {
            if (maxLength > num1.Vertical[n].Array.length) {
              if (num1.OperateAB != "÷")
                num1.Vertical[n].Array.splice(1, 0, "");
            }
          }
          console.log(num1);


          for (var n = 0; n < num1.Vertical.length; n++) {
            var num = xStart + i * 310 + width;
            for (var m = num1.Vertical[n].Array.length - 1; m >= 0; m--) {
              var str = "";
              if (num1.Vertical[n].Type == "line") {

                var lineLength = num1.Vertical[n].Array.length * 30+20;
                var lineTop=-15;
                if (num1.OperateAB == "÷") {
                  lineLength = num1.A.toString().length * 30;
                  lineTop=0;
                }
                
                ctx.moveTo(num, yStart + j * height + n * 30 + lineTop);
                ctx.lineTo(num - lineLength, yStart + j * height + n * 30 + lineTop);
                ctx.stroke();

                if (num1.OperateAB != "÷")
                  isAnswer = true;
                break;
              }
              else {
                str = num1.Vertical[n].Array[m];

                if (num1.OperateAB == "÷" && str == "√") {
                  isAnswer = true;
                  ctx.drawImage("../../images/formula_division_size02.png", num - (num1.Vertical[n].Array.length - m) * 30 - 20, yStart + j * height + n * 30 - 31, 56, 76);
                  //break;
                }
                else if (num1.OperateAB == "÷" && n == 0) {
                }
                else if (num1.OperateAB == "÷" && n == 1) {
                  ctx.fillText(str, num - (num1.Vertical[n].Array.length - m) * 10, yStart + j * height + n * 30);
                }
                else {
                  ctx.fillText(str, num - (num1.Vertical[n].Array.length - m) * 30, yStart + j * height + n * 30);
                }
              }

            }
            if (isAnswer)
              break;
          }

        }
      }
    }

    ctx.setTextAlign('left');
    ctx.setTextBaseline('top');
    ctx.setFontSize(32);
    ctx.fillText(item.Name, 60, 45);
    ctx.fillText("99", 835, 50);


    ctx.setFontSize(12);
    ctx.fillText(item.CagegoryName, 60, 90);
    ctx.fillText("共" + item.QuestionList.length + "道题", 60, 125);
    ctx.fillText("第 1 / 1 页", 60, 147);
    ctx.fillText("答案检索号", 768, 60);

    ctx.setTextAlign('right');
    ctx.fillText("出题时间 " + item.CreateTime, 875, 94);
    ctx.fillText("微信扫一扫 计时看答案", 875, 111);
    ctx.fillText("《数学计算题》选题 打印 扫码 批改", 875, 137);
    ctx.drawImage("../../images/answer.png", 890, 54, 100, 100);


    ctx.draw(true, function (n) {
      wx.canvasToTempFilePath({
        x: 0,
        y: 0,
        width: 2100,
        height: 2970,
        destWidth: 2100,
        destHeight: 2970,
        canvasId: 'Canvas',
        success: function (res2) {
          console.log(res2.tempFilePath);
          wx.previewImage({
            current: res2.tempFilePath, // 当前显示图片的http链接
            urls: [res2.tempFilePath] // 需要预览的图片http链接列表
          });
        }
      })
    });

    function getLength(str) {
      switch (str) {
        case "0":
        case "1":
        case "2":
        case "3":
        case "4":
        case "5":
        case "6":
        case "7":
        case "8":
        case "9":
          return 15;
        case ".":
          return 8;
        default:
          return 12;
      }
    }
  },
  moveLeft: function () {
    this.setData({
      Left: this.data.Left + 375,
    });
  },
  moveRight: function () {
    this.setData({
      Left: this.data.Left - 375,
    });
  }
});