HTML5 Canvas 中的取消绑定功能-前端问题

unbind function in HTML5 Canvas(HTML5 Canvas 中的取消绑定功能)

本文介绍了HTML5 Canvas 中的取消绑定功能的处理方法，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

我想在 HTML5 Canvas 中解绑函数...

I want to unbind function in HTML5 Canvas...

示例:当我在选择选项矩形后选择画笔时，它也会在我使用画笔时创建矩形.请帮助我解决同样的问题.

Example: when I am selecting Brush after selecting option rectangle its creating Rectangle also when I am using brush. Please help me regarding same.

谢谢

开发

推荐答案

选择矩形然后橡皮擦后看到另一个矩形的原因如下:

The reason you are seeing another rectangle after selecting rectangle and then eraser is because of the following:

    function addClick(x, y, dragging) {
        clickX.push(x);
        clickY.push(y);
        clickDrag.push(dragging);
        hitColors.push(bgColor);
        clickTool.push(tool);
        toolSize.push(radius);
    }

您正在将每个单击的工具添加到 clickTool 数组.所以一旦你添加了矩形然后橡皮擦，矩形仍然存在.

You are adding every tool that is clicked to clickTool array. So once you add the rect then eraser, the rect is still there.

然后当你循环时:

    function redraw() {
        context.width = canvas.width; // Clears the canvas
        context.lineJoin = "round";        

        for (var i = 0; i < clickX.length; i++) {
           // this will log rect then eraser over and over
           console.log(clickTool[i]);
        // ......
        }
    }

因此，您需要弄清楚为什么要拥有一系列已被选中的工具，也许您一次只需要一个而不是全部持有.

So you need to work out why you want to have an array of tools that have been selected, maybe you only need to have one at a time instead of holding on to them all.

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