本文介绍了如何在kineticjs中创建Undo-Redo?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

有没有简单的方法来创建Kineticjs中的 undo redo 函数?
我在,但我不知道如何放入Kineticjs,请帮助我。
谢谢。

解决方案

我能够实现一个基于。我还使用了这个中的一些代码作为示例来绘制矩形,所以学分去他们和Chtiwi。

我的解决方案的唯一区别是我用jSON()来存储每个图层状态在一个数组中,而不是toDataURL()在画布上。我认为toJSON()对于toDataURL()是需要的,以便能够序列化所有必要的数据以将每个动作存储在画布上,但我不是100%的,因此如果其他人知道,请留下评论。

 函数makeHistory(){
historyStep ++;
if(historyStep< history.length){
history.length = historyStep;
}
json = layer.toJSON();
history.push(json);

$ / code>

每次您想要保存一个步骤以撤销或重做时调用此函数。在我的例子中,我在每个mouseup事件中都调用了这个函数。



将这两个函数绑定到Undo / Redo事件。

  function undoHistory(){
if(historyStep> 0){
historyStep--;
layer.destroy();
layer = Kinetic.Node.create(history [historyStep],'container')
stage.add(layer);



函数redoHistory(){
if(historyStep< history.length-1){
historyStep ++;
layer.destroy();
layer = Kinetic.Node.create(history [historyStep],'container')
stage.add(layer);


以下是。不要忘记初始化数组,并将计数器放在顶部。祝你好运!


Is there any simple way how to create undo redo function in Kineticjs ? I have found a Undo Manager for HTML 5 in https://github.com/ArthurClemens/Javascript-Undo-Manager, but I don't know how to put in Kineticjs, please help me.thank you.

解决方案

I was able to implement a simple solution based on a post by Chtiwi Malek at CodiCode. I also used some of the code from this problem as an example to draw rectangles, so credits go to them and Chtiwi.

The only difference in my solution is I used toJSON() to store each layer state in an array instead of toDataURL() on the canvas. I think toJSON() is needed over toDataURL() to be able to serialize all the data necessary to store each action on the canvas, but I'm not 100% on this so if someone else knows please leave a comment.

function makeHistory() {
    historyStep++;
    if (historyStep < history.length) {
        history.length = historyStep;
    }
    json = layer.toJSON();
    history.push(json);
}

Call this function everytime you want to save a step to undo or redo. In my case, I call this function on every mouseup event.

Bind these 2 functions to the Undo/Redo events.

function undoHistory() {
    if (historyStep > 0) {
        historyStep--;
        layer.destroy();
        layer = Kinetic.Node.create(history[historyStep], 'container')
        stage.add(layer);
    }
}

function redoHistory() {
    if (historyStep < history.length-1) {
        historyStep++;
        layer.destroy();
        layer = Kinetic.Node.create(history[historyStep], 'container')
        stage.add(layer);
    }
}

Here's the jsfiddle. Don't forget to initialize the array and step counter up top. Good luck!

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09-21 00:08