protractor screen 测角投影屏
Screen Angle indicator: a protractor with many co - centre circles.
网角指示器：是一个带有很多同心圆的量角器。
It is an all-in-one program that provides full-featured screen capture tool, intuitive image editor, color picker, color palette, pixel ruler, protractor, crosshair and even whiteboard.
它是所有功能于一身的的程序，提供功能全面的屏幕捕捉工具，直观的图像编辑器，颜色选择器，调色板，像素尺，量角器，十字线，甚至白板。
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