getPoster: function (event){

var _this=this;

//绘图开始

var ctx_height = _this.data.goods_canvas_height;

var ctx_width = _this.data.goods_poster_width;

var ctx = wx.createCanvasContext('myCanvas')

ctx.setFillStyle('#fff')

ctx.fillRect(0, 0, ctx_width, ctx_height)

//店铺头像填充绘制的圆

ctx.setFillStyle('#000')

ctx.save()

ctx.beginPath()

ctx.arc(ctx_width * 0.14 / 2 + 10, ctx_width * 0.14 / 2 + 10, ctx_width * 0.14 / 2, 0, 2 * Math.PI)

ctx.clip()

ctx.drawImage(_this.data.astore_logo_path, 10, 10, ctx_width * 0.14, ctx_width * 0.14)

ctx.restore()

//店铺名称

ctx.setFontSize(14)

ctx.setTextAlign('left')

ctx.setTextBaseline('middle')

ctx.fillText(_this.data.agent4_info.astore_name ? _this.data.agent4_info.astore_name : _this.data.agent4_info.agent4_name, ctx_width * 0.14 + 20, ctx_width * 0.14 / 2 + 10)

var text_start = 10;

//自营图标

if (typeof (_this.data.ziying_width) == 'undefined') {

var ziying_width = 25;

} else {

var ziying_width = _this.data.ziying_width / _this.data.ziying_height * 12;

}

ctx.drawImage(_this.data.ziying_path, text_start, ctx_width * 0.14 + 20, ziying_width, 12)

text_start = text_start + ziying_width + 5;

//跨境图标

if (_this.data.goods_info.cross_border) {

if (typeof (_this.data.kuajing_width) == 'undefined') {

var kuajing_width = 25;

} else {

var kuajing_width = _this.data.kuajing_width / _this.data.kuajing_height * 12;

}

ctx.drawImage(_this.data.kuajing_path, text_start, ctx_width * 0.14 + 20, kuajing_width, 12)

text_start = text_start + kuajing_width + 5;

}

//商品名换行

ctx.setFontSize(12)

ctx.setTextBaseline('top')

var temp_text_start = text_start;

var chr = _this.data.goods_info.goods_name.split("");//这个方法是将一个字符串分割成字符串数组

var temp = "";

var row = [];

for (var a = 0; a < chr.length; a++) {

if (ctx.measureText(temp).width < ctx_width - temp_text_start - 10-10) {

temp += chr[a];

}

else {

temp_text_start = 10;

a--; //这里添加了a-- 是为了防止字符丢失，效果图中有对比

row.push(temp);

temp = "";

}

}

row.push(temp);

//如果数组长度大于2 则截取前两个

if (row.length > 2) {

var rowCut = row.slice(0, 2);

var rowPart = rowCut[1];

var test = "";

var empty