Home > Article > Web Front-end > How to solve HTML5 Canvas image blur
How to solve HTML5 Canvas image blur
- 小云云Original
- 2018-02-07 09:19:203369browse
This article mainly introduces to you the perfect solution to HTML5 Canvas image blur. Friends who need it can refer to it. I hope it can help everyone.
1. I recently used h5 canvas to draw animations and found that the images were particularly blurry. Later, I finally found that the culprit was the code
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
, because this line of code was stretched
2. Blurred image effect:
3. The effect after removing the compression
You can change the code to
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="user-scalable=no" />
<title>赛事详细页</title>
<script src="js/rem.js" type="text/javascript" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="css/m_reset.css" />
<link rel="stylesheet" type="text/css" href="css/gameListsNew.css" />
<link href="css/mask.css" rel="stylesheet" />
</head>
<body>
<p class="tipMask">
<p class="tipBox">
<img src="img/faileTip.png" class="tipsImg" />
<p class="fileBtn">
<img src="img/fileBtn.png" />
<span class="tryAgain">再试一次</span>
</p>
</p>
</p>
<p>
<img src="img/whiteBack.png" class="titleImg" />
<p class="bgEvent" id="contentbody">
<p id="eventDetail" v-cloak>
<!--标题-->
<p class="detailevent">
<p class="titlevs">
<img class="teamFlagLogo" onerror="nofind(this);" :src="'img/teamlogonew/'+eventDetail.HomeTeamID+'.png'" />
<p class="countryName">
{{eventDetail.HomeTeamName}}
</p>
</p>
<p class="titlevs" style="padding-top:0.3rem ;">
<p>
<!--未开赛-->
<!--<p class="theWorldCup">世界杯</p>-->
<p class="theGameNowDataTime">{{eventDetail.TimeFormat }}</p>
<p class="gameBeginTime">{{getScoreOrVs(eventDetail.HomeTeamScore,eventDetail.AwayTeamScore)}}</p>
</p>
<!--开赛时长-->
<!--<p>
<p>73:40</p>
</p>-->
</p>
<p class="titlevs">
<img class="teamFlagLogo" onerror="nofind(this);"
:src="'img/teamlogonew/'+eventDetail.AwayTeamID+'.png'" />
<p class="countryName">
{{eventDetail.AwayTeamName}}
</p>
</p>
</p>
<p id="ordersuccess" class="ordersuccess">
<p style="text-align:right;padding-top:0.2rem;padding-left:0.2rem;">
<img src="img/ordersuccess/close.png" style="width:0.45rem;height:0.45rem;" id="closesuccess" onclick="closesuccess();" />
</p>
<p class="teamname">
<p class="teamnameitem"><p class="teamnameitemtop">{{eventDetail.HomeTeamName}}</p><br /><p class="teamnameitembottom">HOME</p></p>
<p class="teamnameitem "><p class="teamnameitemmiddle">VS</p></p>
<p class="teamnameitem"><p class="teamnameitemtop">{{eventDetail.AwayTeamName}}</p><br /><p class="teamnameitembottom">AWAY</p></p>
</p>
<p class="teamdetail">
<p class="teamdate"><span>{{eventDetail.CompetitionName}}</span><span>/</span><span>{{eventDetail.DateFormat}}</span></p>
<p class="teamplaysselection">
<table style="width:100%;text-align:left;height:100%;">
<tr>
<td class="teamplaysselectiontop" style="width:50%;">玩法</td>
<td class="teamplaysselectiontop" style="width:50%;">选项</td>
</tr>
<tr>
<td class="teamplaysselectionbottom" style="width:50%;" id="rulename">Match Odds</td>
<td class="teamplaysselectionbottom" style="width:50%;" id="selectionname">Home</td>
</tr>
</table>
</p>
<p class="teamwinmoney">
<table style="width:90%;text-align:left;height:100%;">
<tr>
<td class="teamwinmoneytop" style="width:50%;">
本金
</td>
<td class="teamwinmoneytop" style="width:50%;">
赔率
</td>
<td class="teamwinmoneytop" style="width:50%;">
预赢
</td>
</tr>
<tr>
<td class="teamwinmoneybottom" style="width:50%;" id="betmoneysuc">1000</td>
<td class="teamwinmoneybottom" style="width:50%;" id="betodds">12.54</td>
<td class="teamwinmoneybottom" style="width:50%;" id="betwin">12540</td>
</tr>
</table>
</p>
</p>
</p>
</p>
<p>
<p class="square" id="square">
<canvas id="courtCaseNew" width="980" height="765"></canvas>
</p>
<img src="img/balllittle.png" style="width:20px;height:20px;display:none;" id="imgballNew" />
</p>
<p class="middlechat">
<p class="middleitem" id="jcc">
<p class="tabActive">竞猜场</p>
</p>
<p class="middleitem" id="jcjl">
<p class="tabCommon">竞猜记录</p>
</p>
<p class="middleitem" id="sssj">
<p class="tabCommon">赛事事件</p>
</p>
<p class="middleitem" id="jstj">
<p class="tabCommon">技术统计</p>
</p>
</p>
<p class="downChangrTab quizGames" style="display: block;">
<p id="ruleTypeItems" v-cloak>
<!--胜平负-->
<p class="diffPlaysTetx" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==100">
<span class="speciesName">赛果</span>
<span class="rotary" v-if="item.State!=1">(已封盘)</span>
<span class="speciesExp">猜90分钟(含补时)两队的比赛结果</span>
</p>
<p v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==100" id="result" name="selectionItems" class="result">
<p v-bind:class="[(select.BackOdds<1.01 || item.State!=1) ? 'resutitemGray commonBorderGray':'resutitem commonBorder']" v-for="(select,index) in item.Selection"
v-on:click="select.BackOdds>=1.01 &&clickFun($event,item.State,select.BackOdds,item.MarketId,select.SelectionId,'赛果',select.SelectionName);" name="itemSelection">
<p class="winEquLose" v-bind:name="'item'+item.MarketId">{{select.SelectionName}}</p>
<p class="winEquLoseOdds " v-bind:name="'item'+item.MarketId">
<span v-bind:id="item.MarketId+select.SelectionId" v-bind:maxlimit="select.MaxStakeLimit">{{select.BackOdds}}</span>
<img src="img/upIng.png" style="width:0.2rem;display:none;" v-bind:id="'redOne'+item.MarketId+select.SelectionId" />
<img src="img/downIng.png" style="width:0.2rem;display:none;" v-bind:id="'greenOne'+item.MarketId+select.SelectionId" />
</p>
</p>
</p>
<!--单双-->
<p class="diffPlaysTetx" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==130">
<span class="speciesName">单双</span>
<span class="rotary" v-if="item.State!=1">(已封盘)</span>
<span class="speciesExp">猜90分钟(含补时)比赛总进球的单双</span>
</p>
<p id="oddeven" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==130" name="selectionItems" class="oddeven">
<p v-bind:class="[(select.BackOdds<1.01 || item.State!=1) ? 'oddevenitemGray commonBorderGray':'oddevenitem commonBorder']" v-for="(select,index) in item.Selection" v-on:click="select.BackOdds>=1.01 &&clickFun($event,item.State,select.BackOdds,item.MarketId,select.SelectionId,'单双',select.SelectionName)" name="itemSelection">
<p class="winEquLose" v-bind:name="'item'+item.MarketId" v-bind:id="'selectionname'+item.MarketId+select.SelectionId">{{select.SelectionName}}</p>
<p class="winEquLoseOdds" v-bind:name="'item'+item.MarketId">
<span v-bind:id="item.MarketId+select.SelectionId" v-bind:maxlimit="select.MaxStakeLimit">{{select.BackOdds}}</span>
<img src="img/upIng.png" style="width:0.2rem;display:none;" v-bind:id="'redOne'+item.MarketId+select.SelectionId" />
<img src="img/downIng.png" style="width:0.2rem;display:none;" v-bind:id="'greenOne'+item.MarketId+select.SelectionId" />
</p>
</p>
</p>
<!--总进球-->
<p class="diffPlaysTetx" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==410">
<span class="speciesName">总进球 </span>
<span class="rotary" v-if="item.State!=1">(已封盘)</span>
<span class="speciesExp">猜90分钟(含补时)比赛总进球的数 </span>
</p>
<p id="totalGoals" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==410" name="selectionItems" class="totalGoals">
<p v-bind:class="[(select.BackOdds<1.01 || item.State!=1) ? 'totalGoalitemGray commonBorderGray':'totalGoalitem commonBorder']" v-for="(select,index) in item.Selection" v-on:click="select.BackOdds>=1.01 &&clickFun($event,item.State,select.BackOdds,item.MarketId,select.SelectionId,'总进球',select.SelectionName)" name="itemSelection">
<p class="winEquLose" v-bind:name="'item'+item.MarketId" v-bind:id="'selectionname'+item.MarketId+select.SelectionId">{{select.SelectionName}}</p>
<p class="winEquLoseOdds" v-bind:name="'item'+item.MarketId">
<span v-bind:id="item.MarketId+select.SelectionId" v-bind:maxlimit="select.MaxStakeLimit">{{select.BackOdds}}</span>
<img src="img/upIng.png" style="width:0.2rem;display:none;" v-bind:id="'redOne'+item.MarketId+select.SelectionId" />
<img src="img/downIng.png" style="width:0.2rem;display:none;" v-bind:id="'greenOne'+item.MarketId+select.SelectionId" />
</p>
</p>
</p>
<!--全场比分-->
<p class="diffPlaysTetx" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==140">
<span class="speciesName">全场比分</span>
<span class="rotary" v-if="item.State!=1">(已封盘)</span>
<span class="speciesExp">猜90分钟(含补时)全场比分</span>
</p>
<p id="correctScoreHome" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==140" name="selectionItems" class="correctScoreHomeAway">
<p v-bind:class="[(select.BackOdds<1.01 || item.State!=1) ? 'correctScoreitemGray commonBorderGray':'correctScoreitem commonBorder']" v-for="(select,index) in item.Selection" v-on:click="select.BackOdds>=1.01 &&clickFun($event,item.State,select.BackOdds,item.MarketId,select.SelectionId,'全场比分',select.SelectionName)" name="itemSelection">
<p class="winEquLose" v-bind:name="'item'+item.MarketId" v-bind:id="'selectionname'+item.MarketId+select.SelectionId">{{select.SelectionName}}</p>
<p class="winEquLoseOdds" v-bind:name="'item'+item.MarketId">
<span v-bind:id="item.MarketId+select.SelectionId" v-bind:maxlimit="select.MaxStakeLimit">{{select.BackOdds}}</span>
<img src="img/upIng.png" style="width:0.2rem;display:none;" v-bind:id="'redOne'+item.MarketId+select.SelectionId" />
<img src="img/downIng.png" style="width:0.2rem;display:none;" v-bind:id="'greenOne'+item.MarketId+select.SelectionId" />
</p>
</p>
</p>
<p class="downImg" onclick="clickImg()">
<img src="img/toDown.png" />
</p>
<!--下一进球-->
<p class="diffPlaysTetx" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==350">
<span class="speciesName">下一进球</span>
<span class="rotary" v-if="item.State!=1">(已封盘)</span>
<span class="speciesExp">猜90分钟(含补时)下一进球的球队</span>
</p>
<p id="nextgoal" v-for="(item,index) in eventDetail.Market" v-if="item.RuleType==350" name="selectionItems" class="result">
<p v-bind:class="[(select.BackOdds<1.01 || item.State!=1) ? 'resutitemGray commonBorderGray':'resutitem commonBorder']" v-for="(select,index) in item.Selection" v-on:click="select.BackOdds>=1.01 &&clickFun($event,item.State,select.BackOdds,item.MarketId,select.SelectionId,'下一进球',select.SelectionName)" name="itemSelection">
<p class="winEquLose" v-bind:name="'item'+item.MarketId" v-bind:id="'selectionname'+item.MarketId+select.SelectionId">{{select.SelectionName}}</p>
<p class="winEquLoseOdds" v-bind:name="'item'+item.MarketId">
<span v-bind:id="item.MarketId+select.SelectionId" v-bind:maxlimit="select.MaxStakeLimit">{{select.BackOdds}}</span>
<img src="img/upIng.png" style="width:0.2rem;display:none;" v-bind:id="'redOne'+item.MarketId+select.SelectionId" />
<img src="img/downIng.png" style="width:0.2rem;display:none;" v-bind:id="'greenOne'+item.MarketId+select.SelectionId" />
</p>
</p>
<p class="" style="width: 100%;height:0.45rem;"></p>
</p>
<p class="perchp" style="width: 100%;height:3rem;"></p>
</p>
</p>
<!--竞猜记录-->
<p class="downChangrTab guessRecord">
<p class="hide-body" id="dialogorders">
<p class="tableNameGuess">
<li>玩法</li>
<li>选项</li>
<li>赔率</li>
<li>本金</li>
<li>结果</li>
</p>
<ul style="background:#FFFFFF;height:4.79rem;overflow: scroll;">
<p class="guessedLists" id="contentOrders" v-for="(item,index) in orders">
<li>
{{item.MarketName}}
</li>
<li>
{{item.SelectionName}}
</li>
<li>
{{item.FillPrice}}
</li>
<li>
{{item.FillAmount}}
</li>
<li>
<p v-if="item.Status == '0'"> 待确认</p>
<p v-else-if="item.Status == '1'">订单正常</p>
<p v-else-if="item.Status == '2'">{{item.NetReturn}}</p>
<p v-else-if="item.Status == '3'">订单已被取消</p>
<p v-else-if="item.Status == '4'">订单无效</p>
<p v-else="item.Status == '5'">订单被拒绝，投注延迟期间发生重要事件等原因</p>
</li>
</p>
</ul>
</p>
</p>
<!--赛事事件-->
<p class="downChangrTab" style="display: none;" v-if="">
<p class="login-body" id="contentCases">
<table class="whatHappen" v-if="cases.length >0">
<tr>
<td></td>
<td class="happenedMiddle">
<p class="happenedMiddle_top" style="margin-top: 0.4rem;"></p>
</td>
<td></td>
</tr>
</table>
<table class="whatHappen" style="" v-for="(item,index) in cases" border="0" cellspacing="0" cellpadding="0">
<tr>
<td></td>
<td class="happenedMiddle">
<p class="happenedMiddle_line"></p>
</td>
<td></td>
</tr>
<tr v-if="item.CaseDescription.indexOf('主')>-1">
<td class="eventsHappendLeft_things">
<p class="eventsText">
<p class="eventsTextLeft_time">{{item.CaseMinutes}}'</p>
<p class="eventsTextLeft_Country">{{item.CaseDescription}}</p>
</p>
</td>
<td class="happenedMiddle">
<p class="eventsHappend_img">
<img :src="GetMatchEventImg(item.CaseDescription)" />
</p>
</td>
<td></td>
</tr>
<tr v-if="item.CaseDescription.indexOf('客')>-1">
<td></td>
<td class="happenedMiddle">
<p class="eventsHappend_img">
<img :src="GetMatchEventImg(item.CaseDescription)" />
</p>
</td>
<td class="eventsHappendRight_things">
<p class="eventsText">
<p class="eventsTextRight_Country">{{item.CaseDescription}}</p>
<p class="eventsTextRight_time">{{item.CaseMinutes}}'</p>
</p>
</td>
</tr>
<tr v-if="item.CaseDescription.indexOf('主')<0 && item.CaseDescription.indexOf('主')<0">
<td></td>
<td>
<a class="ti tlefoc">{{item.CaseMinutes}}'</a>
<a class="titlefoc">{{item.DesChina}}</a>
</td>
<td></td>
</tr>
</table>
<table class="whatHappen" v-if="cases.length >0">
<tr>
<td></td>
<td class="happenedMiddle">
<p class="happenedMiddle_line"></p>
<p class="happenedMiddle_top"></p>
</td>
<td></td>
</tr>
</table>
<!--<p style="width: 100%; height: 2.7rem;"></p>-->
</p>
</p>
<!--技术统计-->
<p class="downChangrTab" style="display: none;">
<p class="skillInfoGaryBg" id="stutsskillsData">
<p class="skillInfo" v-for="(item, index) in skillsData">
<li class="shotsOnTargets">
<p class="shotsOnTargets_left">
<p class="skillsTextFonts">{{item.AwayTeamValue}}</p>
<p class="sotl_bg">
<p class="sotl_bgProgress"></p>
</p>
</p>
<p class="shotsOnTargets_middle">
<img :src="GetMatchStatsImage(item.StatsType)" />
<p class="shills_name">{{item.StatsType}}</p>
</p>
<p class="shotsOnTargets_right">
<p class="skillsTextFonts">{{item.HomeTeamValue}}</p>
<p class="sotl_bg">
<p class="sotl_bgProgress"></p>
</p>
</p>
</li>
</p>
</p>
</p>
</p>
<!--底部下单-->
<p class="buttomOrder">
<!--金额输入-->
<!--竞猜金额-->
<p class="aboutMoney">
<input type="text" name="" id="betmoney" class="gussMoney" value="竞猜金额" placeholder="" readonly="readonly" v-model="gussMoney" />
<img src="img/clearBetMoney.png" class="clearGussMoney" id="clearGussMoney" />
<!--余额-->
<span class="balanceMoney" id="minemoney">我的余额：888</span>
<!--下注金额-->
<p class="diffGussMoney" style="text-align:center;">
<ul>
<li name="bettingmoney" class="difGuMonCom" val="100">+100</li>
<li name="bettingmoney" class="difGuMonCom" val="500">+500</li>
<li name="bettingmoney" class="difGuMonCom" val="1000">+1000</li>
<li class="difGuMonCom" id="allin" style="line-height: 0.5rem;">
<p style="height: 0.3rem;">All <span style="margin-left: 0.05rem;">in</span></p>
<p id="allinvalue" style="height: 0.3rem;">100</p>
</li>
</ul>
</p>
<!--确定-->
<p class="subSure subSureRed" style="text-align:center;" onclick="CreateOrder();" id="subSure">
确定
</p>
</p>
</p>
<!--下单成功后遮罩层-->
<p id="overlay" class="overlay"></p>
</p>
<p>
<img src="img/goal/goalball.png" />
<img src="img/goal/goal.png" />
<img src="img/goal/fireworks.png" />
</p>
<script src="js/jquery-1.10.2.min.js" type="text/javascript" charset="utf-8"></script>
<script src="js/vue.min.js" type="text/javascript" charset="utf-8"></script>
<script src="js/common.js?ver=012902" type="text/javascript" charset="utf-8"></script>
<script src="js/jquery.cookie.min.js"></script>
<script src="js/mask.js?ver=012901"></script>
<script type="text/javascript" src="js/eventDetailsNew.js?ver=012908"></script>
<script src="../js/animation.js"></script>
</body>
</html>Related recommendations:
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How to solve the problem of blurred images drawn with Canvas?
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