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I'm a web developer, I want to do following: 1. I want to make a ruler that can measuring on screen, when the left mouse button pressed and make a selected rectangle to draw a ruler. 2. I also want to make some reference-lines on screen and set top, those reference-lines can vertical or horizontal show on screen, just like photoshop reference-lines, and the reference-line can drag and delete. 3. Ruler can adsorbent reference-lines. How should I do it? Any source code or anyone or any idea can help me? thanks very much.