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我有一個畫布,允許用戶使用畫筆繪製它。保存一個令人沮喪的簡單Canvas繪製圖像到本地Web文件夾?
JS
var sketcher = null;
var brush = null;
$(document).ready(function(e) {
localStorage.setItem("clickCount", 0);
var alpha = localStorage.getItem("alpha");
if(!alpha){
alpha = 10;
}
alpha = (parseInt(alpha))/10;
console.log(alpha);
//Get Brush Opacity
var power = localStorage.getItem("power");
var expo = localStorage.getItem("expo");
power = parseInt(power);
expo = parseInt(expo);
var opacity = ((expo/100)+ 1) * (power/10)/100;
console.log(opacity);
var standBy = localStorage.getItem("standBy");
var brushSize = localStorage.getItem("spotDiameter");
brush = new Image();
brush.src = 'assets/brush_spot_'+ brushSize + '.png';
// brush.src = 'assets/brush_spot_'+ brushSize +"_"+ alpha + '.png';
if(standBy == "false"){
brush.onload = function(){
sketcher = new Sketcher("sketch", brush);
var canvas = document.getElementById('sketch');
var c = canvas.getContext("2d");
c.globalAlpha = opacity;
}
}
$("#sketch").css("cursor", "url(assets/cursor_spot_"+ brushSize +"_"+ alpha +".ico) 12 12, auto");
var clickCount = 0;
$('#sketch').click(function(e){
if(standBy == "true"){
e.preventDefault();
}
else{
clickCount++;
localStorage.setItem("clickCount", clickCount);
$("#clickCount").text(clickCount);
}
});
HTML
<canvas id="sketch" width="1024" />
<canvas id="draw"/>
我有一個網頁sketcher.js和trignometry.js之前裝載兩個相關的js文件。
我需要做的是將任何在畫布上繪製到localstorage或作爲本地文件夾中的臨時文件,每次畫布加載時都可以調用它。
我使用此功能\t變種dataURL = sketch.toDataURL(); \t console.log(保存)但現在我得到一個污染的畫布不能導出錯誤。 – user3323371