image_grabber's Introduction

Canvas Image Grabber

用HTML5 Canvas实现的类似Photoshop钢笔和魔棒工具。

操作说明：

拖拽图片到浏览器窗口
使用+和-进行缩放
魔棒工具点击图片，使用Delete/Backspace键可以删除所选的像素
钢笔工具绘制一个路径，按选项面板的Mask按钮可以只显示路径内的图像
使用钢笔工具时可以配合Option/Alt键来操作节点和控制杆
点击Save按钮会将当前画布状态输出成图片

实现说明：

魔棒工具的算法使用的是Flood Fill，用了Web Workers来做计算，尽可能保证界面的响应
蚁线参考Code Pen的这个示例。当图像缩放到尺寸较大时有渲染性能问题
钢笔工具为了方便判断，直线去曲线都是用bezierCurveTo方法来绘制，借鉴了Photoshop的交互，简化了组合键和选择交互
Mask遮罩选项使用Canvas Global Composite Operation提供的destination-in方式来绘制

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