This circumstance is caused by the existing constraint imposed by the specifics of the interaction of modern web browsers (none of which has the functionality of providing web applications with access to information about the display’s physical parameters) with operating systems. In most practical cases, this calculated value does not correspond to the real extent and is instead proposed for consideration as an approximate one for consideration purposes. The diagonal of the current device's display, automatically detected by the browser, is. This presents many of the most common options among users. You can also select the size from the drop-down list (which opens when you click the button ▾, which is adjacent to the numeric input field). Then click the ↹ Calibrate or press the button ↵ Enter on the keyboard. Enter this value in the input field located in the lower left corner of the ruler image. Specify the size of the diagonal of your screen in inches ("). You can calibrate it in one of the following two ways:
#REAL SIZE RULER HOW TO#
💁 How to use this online rulerįor the ruler to display correctly (i.e., in proportion to the actual physical size), it must be calibrated. The maximum length of the ruler (fully visible when displayed on a sufficient screen) is 20 inches, or 50 centimeters (500 millimeters) for the metric scale option. This online app works on both computers with a large screen (laptops, PCs, monoblocks or smart TVs) and mobile gadgets (phones, phablets, tablets, e-ink readers). You can make the necessary measurements on any device that allows you to browse the web. The blue square represents which part of the plane is shown on the screen.If you want to measure the actual size of a small object in inches or centimeters and you don’t have a real ruler at hand, this virtual on-screen online ruler will help you. For example, here we see the white plane which appears for the intersection of the camera frustum. To do that we should know at which distance an object is placed on the screen. And it doesn’t matter whether we want to show a 3D object or 2D object.īasically, we need to take the camera frustum into account to calculate how much screen space is taken by 1 unity meter. Once we know the pixel size, it becomes a piece of cake to show an object on the screen in real-world size. Knowing the diagonal we could calculate the sides of the screen: The solution we came up with was to ask a user to enter his screen’s diagonal and then calculate the width and height in inches/centimeters. Thus, we needed to find another solution to the problem.
#REAL SIZE RULER ANDROID#
But the issue came up – it didn’t work on Android and could return wrong values. For starters, we took the DPI (dots per inch) of a screen using Unit圓D API. We have tried a few ways of calculating the pixel size without entering any parameters of the user’s monitor.
That would allow us to find how many pixels the required object must be rendered with. The first complication was to find a physical pixel size. We split the problem into smaller ones to solve each one by one. At the very beginning, we have brainstormed what techniques to use before implementing the solution.
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