"ruler-js is a tiny JavaScript plugin for generating horizontal and vertical rulers with support for multiple units and interactive crosshairs. Works as both a standalone JavaScript library and a jQuery plugin. The plugin handles DPI calculations automatically and adapts to window resizing without additional configuration. It's ideal for developers building design tools, prototyping interfaces, or debugging complex layouts where pixel-perfect measurements matter."
"Multiple Unit Support: Measures in inches, centimeters, millimeters, and pixels with configurable decimal precision. Interactive Crosshair System: Displays real-time crosshair lines that track mouse movement with customizable colors and line styles. Live Position Feedback: Shows current mouse coordinates in a floating box that updates dynamically as you move across the viewport. Automatic DPI Detection: Calculates pixels-per-inch based on browser rendering to approximate real-world measurements accurately."
"Customizable Appearance: Configure ruler dimensions, tick colors, crosshair styles, and mouse position box styling to match your application's design. Responsive Design: Automatically recalculates and redraws tick marks when the window resizes. Use Cases: Design implementation verification: Compare developed layouts directly against designer mockups by measuring spacing, dimensions, and alignment in actual browsers . Responsive breakpoint testing: Check how element proportions and spacing scale across different screen sizes using real-world units rather than just pixels ."
ruler-js generates horizontal and vertical on-screen rulers that measure in inches, centimeters, millimeters, and pixels with configurable decimal precision. An interactive crosshair system tracks mouse movement and displays live crosshair lines using customizable colors and line styles. A floating position box shows dynamic mouse coordinates while automatic DPI detection approximates real-world pixels-per-inch based on browser rendering. Ruler dimensions, tick colors, crosshair styles, and mouse box appearance are all configurable. The plugin recalculates and redraws tick marks on window resize. Typical uses include verifying design implementation, testing responsive breakpoints, measuring CSS framework layouts, and demonstrating positioning and spacing concepts.
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