units of length

first, unit and value 1.1 Color valuesThe color settings in a Web page are very important, with font color (color), background color (background-color), border color (border), and so on, there are many ways to set colors:1, English command colorThe Setup method is often used in the previous sections:p{color:red;}2. RGB ColorThis is consistent with the RGB colors in Photoshop and is color-matched by the proportions of R (red), G (green), and B (blue) Three colors.P{color:rgb (133,45,200);}The v

css| Web page Because style sheet items are made up of attributes and their values, it is necessary to understand the various units of the property value. In CSS, the various units and in the HTML are different, please pay attention to distinguish between the reader. 1. Length Unit Abbreviation Unit type description CM cmEM ems width of M letters in current fontE

Absolute layout absolutelayout, inherited from viewgroup, the size and location of subcomponents are defined entirely by the developer itself. The sub-group price can specify the following two attributes:Android:layout_x: Specifies the x-coordinate of the subassembly Android:layout_y: Specifies the y-coordinate of the subassembly Android Common distance units:1. px(pixels): Each px corresponds to a point on the screen. 2. dip or dp(deviceindepende

/responsive_web_design.html Conversion between em and px Common web font units Pixel (px) Determine the length based on the display resolution. This unit is usually used in web applications; Font height (em) The size of the current text. For example, {font-size: 2em} indicates that the text size is twice the original size. The default font size of the browser is 16 PX, and 2em = 32px is not set. Root em (

and SP take the same value of 1, you can set the coefficient of x between 1pt and 1SP, 1 * density_device/72 = x * 1 * density_device/160 =gt; x = 160/72 = 2.2222 Which means that in Android, 1pt is about 2.22SP. =================================================================== What is dip and SP In the past, programmers used to design computer user interfaces in pixel units. For example, define a table with a width of 300 pixels A single fi

DP (DIP): device independent pixels (unit independent pixels). Different devices have different display effects, this is related to the device hardware, generally we support WVGA, HVGA and QVGA recommend this, do not rely on pixels.Px:pixels (pixels). Different devices show the same effect, generally we hvga represent 320x480 pixels, this use more.Pt:point, is a standard length unit, 1pt=1/72 inches, for the printing industry, very simple to use;sp:sc

units can affect the positioning of units. 　● 3. Control of positioning unit (width, height, visiblility) In addition to controlling the position in the upper left corner of the positioning unit, you can also control the width and height of the unit and the visibility of the Unit on the page. Width: The positioned elements are still displayed from left to right when displayed on the page. You can use the w

CSS presets 16 colors and 16 colors of the derivative color, these 16 colors are recommended by the CSS specification, and some mainstream browsers are able to identify, as shown in the following table:Hexadecimal colors are the most common way to define them. Its basic format is #rrggbb,r, G, and B represent red, green and blue respectively. You can also set the color with RGB (R,G,B), the parameter is represented by the decimal number of the 0~255 To ensure that the page elements can be

 PT (Point, LB): is a unit of physical length that refers to an inch of 72 points. px (pixel, pixels): is a virtual length unit, is the digital image length unit of the computer system, if PX to be converted to physical length, you need to specify the accuracy dpi (Dots per inch, pixels per inch), when scanning prin

Comparison of pixel units dp, px, pt, and sp in androidDp (dip): device independent pixels (device independent pixel ). different devices have different display effects, which are related to the hardware of the device. We recommend that you use this function to support WVGA, HVGA, and QVGA without pixels. Px: pixels (pixels). Different devices have the same display effect. Generally, we use HVGA to represent 320x480 pixels, which is usually used. Pt:

Because style table items are composed of attributes and their values, it is necessary to understand the various units of the attribute values. In CSS, different units are different from those in HTML.1. Length unitUnit Type descriptionCmWidth of m letters in em EMS current fontThe x letter height in the current font of the ex exs.In inchMmPc Picas 1 pica = 12Pt

Quoted here is Jorux's "95% Chinese web site needs to rewrite the CSS" article, the topic is a bit scary, but it is now a number of domestic web page production defects. I have not been clear about the relationship between PX and EM and the characteristics, after seeing the harvest is really great. Usually use PX to define fonts, so can not use browser font amplification function, and most foreign websites can be used under IE. Because: 1. IE cannot adjust the font size used for PX as the unit;

In the implementation of the printing function, encountered a problem, using PX as a unit on different machines or printers printed on the font size is not the same, so after the query, found that using PT units can be used for logistics adaptation, the following is the conversion between units:There are three common units for defining font size, px, EM, PTPxPX is a pixel abbreviation and is a pixel-based u

Css The value of a length consists of an optional plus "+" or minus sign "-", followed by a number, and two letters indicating the unit. There is no space in the value of a length, for example, "1.3 em" is not a valid length value, but "1.3em" is valid. A zero-length two-letter unit declaration is not required. Both th

= display.getwidth ();String Resolution = height > width? Height + "x" + width:width + "x" + height;APICONFIG.SETRESOLUTIONSTR (resolution);densitydpi = 120dpi is ldpi, densitydpi = 160dpi is mdpi,densitydpi = 240dpi is hdpi, densitydpi = 320dpi is xhdpiDisplaymetrics dm = new Displaymetrics ();Getwindowmanager (). Getdefaultdisplay (). Getmetrics (DM);int densitydpi = dm.densitydpi;APICONFIG.SETDENSITYDPI (DENSITYDPI);}}If you need to customize the resource file for Android pad, the directory

First of all, px, EM, rem are relative units;PX (pixel pixels) is relative to the display screen resolution, IE cannot adjust those using PX as the unit of the font size;EM is relative to the size of the text font within the current object, such as the default font size for the browser if the font size of the current inline text is not artificially set. (quoted in the CSS2.0 manual ), but note that the EM unit inherits the font size of the parent elem

Tag: Image its screen resolution differs body decision. com doc size　　today, let's talk about the three font units most commonly used in CSS: Px,em and REM. PX is a unit of relative length, its size is relative to the screen resolution, EM and REM are different, in short, their font size is determined by the reference. For EM, its reference, is the parent font, that is, its size is always based on the paren

reason may be that when IE processes Chinese characters, the floating point value accuracy is limited. I don't know if there are any other explanations. 　　Unit pt description In the printed layout, point is an absolute value, which is equal to 1/72 inch. It can be measured using a ruler, physical inches. But in css, pt does not mean so. Because our display is divided into pixels, a single pixel can only have one color (to simplify it, we will not discuss the next pixel anti-sawtooth technology

111.100 0 2 1 1 1 10 100 2 2 10.111 10.111 1.12 11.12 111.1 2 2 10 10.00 1.00 10.00 100.00 Summary of 1.3.3 We want to differentiate between the three: The number of decimal places in the unit, the integer number of units, and the decimal point of the unit show that the three are controlled by different ways (fields). 1, the nu

= context. getresources (). getdisplaymetrics (). density; Return(Int) (Dipvalue * scale + 0.5f ); } Public static intPxtodip (contextcontext,FloatPxvalue){ Final floatScale = context. getresources (). getdisplaymetrics (). density; Return(Int) (Pxvalue/scale + 0.5f ); } To enable normal display of the current and future display types on the user interface, we recommend that you always use SP as the unit of text size and dip as the unit of other elements. Of course, you can also consider usin