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      1. HTML5 Canvas 中的取消绑定功能

        unbind function in HTML5 Canvas(HTML5 Canvas 中的取消绑定功能)
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                1. 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跟版网的小编来一起学习吧!

                  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.

                  这篇关于HTML5 Canvas 中的取消绑定功能的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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