Ruler Online

1. Current browser width is , height is , size is .

2. You can refer to Common Item Size Information, use the Adjust function, change the scaling factor, and calibrate the ruler. The calibration information will be saved in your local browser and can still be used the next time you use it.

Online ruler, using centimeter ruler, inch ruler, shichi ruler and other types of rulers to measure the length of objects online.

1. Adjust : Use scaling factor to calibrate the accuracy of the ruler. The scaling factor needs to be filled with a value greater than 0 and supports decimals. We suggest that you calibrate with the size information of common items or a real ruler before using it. Why is calibration necessary? Because there is a complex correspondence between the length unit of the browser and the physical length unit under various factors. Therefore, in order to accurately measure the length of an object, it is recommended that you calibrate it before use.
2. Settings : Set multiple parameters for the ruler.
3. Ruler Type : Supports centimeter ruler, inch ruler, and Chinese shichi ruler.
4. Direction : Select to generate a ruler in the horizontal or vertical direction.
5. Text : Select whether to display the scale value and other text above or below the ruler.
6. Start, End : The starting and ending scale values of the ruler. The starting and ending scale values determine the length of the ruler.
7. Height : The ruler's height, measured in pixels.
8. PPI : The PPI (pixels per inch) value of the current monitor is set to 96 by default. If you know the PPI value of the screen, you can modify this parameter. If you don't know, you can use the default value and calibrate the ruler using the scaling factor.
9. Margin : The margin of the ruler is empty by default and has no margin.
10. Line Color, Text Color, Bg Color : Set the line color, text color, and background color of the ruler separately.
11. Reset : Clear custom parameters and reset to initial state.
12. Common Item Size Information

    Item	Width	Height
    A4 Paper	21 cm	29.7 cm
    RMB 100 Yuan	15.5 cm	7.7 cm
    Chinese ID Card	8.56 cm	5.4 cm
    Bank Card	8.56 cm	5.398 cm
    US Dollar	15.6 cm	6.63 cm

13. Embedded ruler
    Support referencing online rulers in the form of https://openapi.lddgo.net/base/gservice/api/v1/get-ruler?url-parameters .
    For example https://openapi.lddgo.net/base/gservice/api/v1/get-ruler?dir=h&start=0&end=20&ruler-type=cm&height=100&ppi=96&text-position=bottom&bg-color=%23ff000011 . The URL of the online ruler supports HTML img tag reference and markdown file reference. Note that the parameter values of the URL need to be escaped using encodeURIComponent.
    URL parameter description for embedding ruler:

    Parameter	Example	Description
    dir	h	Ruler direction, supports h and v
    start	0	Ruler start value
    end	20	Ruler end value
    line-color	#000000FF	Optional parameters, ruler line color
    text-color	#000000FF	Optional parameters, ruler text color
    bg-color	#FFFFFFFF	Optional parameter, ruler background color
    ruler-type	cm	Ruler type, supports cm, inch, shichi
    height	100	Ruler height, unit in pixel
    margin	10	Optional parameters, margin
    ppi	96	ppi value
    text-position	top	Text display position, supports top and bottom
    lang	zh	Optional parameters, language, supports zh and en
    rotate	90	Optional parameter, vertical ruler rotate angle, supports 90 or 270