0
我想在我的小网站中使用undo和redo命令,我使用fabric.js,任何人都有任何想法如何做到这一点,以下是我的code.on点击撤消&重做按钮我试图撤消&重做画布的对象这是爵士小提琴链接在canvas中使用fabric.js撤消和重做命令
$(document).ready(function(){
var canvas = new fabric.Canvas('c');
var colorSet="red";
$("#svg3").click(function(){
fabric.loadSVGFromURL('http://upload.wikimedia.org/wikipedia/en/c/cd/-Islandshreyfingin.svg', function (objects, options) {
var shape = fabric.util.groupSVGElements(objects, options);
shape.set({
left: canvas.width/2,
top: canvas.height/2,
scaleY: canvas.height/shape.width,
scaleX: canvas.width/shape.width
});
if (shape.isSameColor && shape.isSameColor() || !shape.paths) {
shape.setFill(colorSet);
} else if (shape.paths) {
for (var i = 0; i < shape.paths.length; i++) {
shape.paths[i].setFill(colorSet);
}
}
canvas.add(shape);
canvas.renderAll();
});
});
$("#undo").click(function(){
yourJSONString = JSON.stringify(canvas);
});
$("#redo").click(function(){
canvas.clear();
//alert(yourJSONString);
canvas.loadFromJSON(yourJSONString);
canvas.renderAll();
// alert(svgobj);
});
});
使用这些[链接](http://stackoverflow.com/questions/15516218/how-to-handle-undo-redo-event-in-javascript),[链接](http://jsfiddle.net/ jfriend00/6qyS6 /)我相信这些对你有帮助。 – John
参见http://stackoverflow.com/questions/6386743/implementing-undo-in-a-web-app。 –
查看[这个问题](http://stackoverflow.com/questions/25357895/using-stateproperties-and-hasstatechanged-to-implement-undo-red-in-fabric-js)一个工作,但未完成的方法。 – fzzylogic