replicator 2x

recommended by Apple, which is better than bitmapcontext because it seems to be accelerated using the iPhone hardware (drawing-card ). Cglayerref CG = cglayercreatewithcontext (CTX, cgsizemake (320,480), null); // you need to use cglayercontext as the cache context. This is a required cgcontextref layercontext = cglayergetcontext (CG ); cgcontextdrawimage (layercontext, cgrectmake (160,230,160,230), IMG); cgcontextdrawlayeratpoint (CTX, cgpointmake (0, 0), CG ); 5. Contents of calayer UIImage*

contains some of its own display information (such as: Display position, color value, transparency, etc.).When it comes to this, you have to say, what is the display of the retina film?In theory, the 1-bit pixels correspond to 1 physical pixel images for a perfectly clear display.There is no problem on the normal screen, but there is not enough bit image dot in the retina screen, which causes the picture to blur.Use a picture to indicate:For example, for the retina screen of dpr=2, 1 bit pixels

Brief introduction The two days after the update Xcode8 found that Xcode to the icon requirements have changed, used before a small application of "Iconkit" has not caught up with the rhythm, can not meet the Xcode8 requirements. So I thought of using Python to make my own script to generate an icon. In fact, this script is written very early, now in order to adapt to iOS10, on the revised and perfected, and put to the GitHub. You can look at the effect chart: Code: #encoding =utf-8

Summary Struts is an excellent framework for Java Web development. Struts is one of the Apache projects and now struts has been widely supported in the Java development community. In this article, Julien Mercay and Gilbert Bouzeid will introduce the process of struts, describe the struts framework, and finally put forward the design method of model 2x. Model 2x replaces the JSP page in the original present

proportions 2x = @2xRetina 4 = 568h@2xRetina HD 4.7 = @2xRetina HD 5.5 = @3x iOS icon iphone 6 Plus @3x 180 x 180 iphone 6 5 @2x x 4s @2x 11/>ipad mini2+ @2x 152 x 152 ipad 2 and ipad mini @1x x 76 iOS Load Map iOS 7,8 (portrait)

There are many adapter cards in the computer, such as: Video card, sound card, NIC, modem card, TV card, SCSI interface card, IDE interface card, they are connected with the motherboard through AGP, PCI or ISA bus slots on the motherboard. In fact, these adapter card installation process are similar, this period to a typical graphics card as an example, I believe we can extrapolate, the smooth installation of other adapter card. First, understand the interface type of AGP video card The graphi

B (x,y) =γ (x) γ (y) γ (x+y).whichGamma (x) =∫+∞0e−ttx−1dt,b (x,y) =∫10tx−1 (1−t) Y−1dt.ProveGamma (x) γ (y) =∫+∞0e−ttx−1dt∫+∞0e−ssy−1ds=∫+∞0∫+∞0e− (s+t) tx−1sy−1dsdt=4∫+∞0∫+∞0e− (u2+v2) U2X−2V2Y−2⋅UVDUDV (T=U2,S=V2) =4∫+∞0∫+∞0e− (U2+V2) u2x−1v2y−1dudv=∫+∞−∞∫+∞−∞e− (U2+V2) |u|2x−1|v|2y−1dudv=∫+∞0∫2π0re−r2r2x−1|cosθ|2x−1r2y−1|sinθ |2y−1drdθ (u=rcosθ,v=rsinθ) =∫+∞0re−r2r2x+2y−2dr∫2π0|cosθ|

'}method Five: Dict--fromkeys method # If the values of the keys are the same, it is better in this way and can be initialized with Fromkeys>>> D5 = Dict.fromkeys ([' A ', ' B '],0) >>> d5{' a ': 0, ' B ': 0}if the value of the key is not provided, the default is None>>> D3 = Dict.fromkeys ([' A ', ' B ']) >>> d3{' a ': none, ' B ': none}"Key-value traversal methods in dictionaries">>> D = {' x ': 1, ' Y ': 2, ' Z ': 3} # method One >>> for key in D:print key, ' = = ', D[key]y =

//Newton iterative method to find square root1 DoubleMYSQRT (Doublenum)2 {3 Doublex = num/2;4 Doubley =0;5 Do{6x = x/2+num/(2*x);7y = x*x-num;8 if(y0) y =-y;9} while(y>0.0001);Ten returnx; One } A intMainintargcChar*argv[]) - { -printf"%.3f", Mysqrt (2));//1.414 the return 0; -}The following explanation is taken from somewhere else and turned around for easy viewing:The principle of this algorithm is very simple, we just constantly use (x,f (x)) tangent to approximat

library is rich, mature and stable, scientific calculation and statistical analysis are very good, production efficiency is much higher than c,c++,java, especially good at strategy backtesting Graphic GUI:PYQT, Wxpython,tkinter Second, the Computer FoundationCPU: equivalent to the human brain, computing and control center. Speed planeMemory: temporarily stored and supplied with CPU data. Speed HSR. The cost is high and the power loss disappears.hard disk: the equivalent of a computer d

design is not. Because web design works on a pixel basis, it is used to create perfect shapes and lines. Even if we bloom the picture in a certain proportion and then export it through Photoshop, the picture that comes out is also a blurry appearance, especially when it comes to small icons. How code controls Retina images Once you create a copy of a standard picture, and the copy is twice times the size of the standard picture, you can load them into your page in a different way. Here's a qu

devicePixelRatio value is equal to 1 (that is, the minimum value,When the devicePixelRatio ValueIf it is greater than 1 (usually 1.5, 2.0), it is a high-definition display. How to call mobile terminalsHD background image To better improve user experience and reduce traffic on the mobile end, we can use a no-use solution for different display screens to ensure that images can be normally displayed on different display screens, this method is similar to the principle of using different images for

http://blog.shiqichan.com/Launch-Screen-in-iOS-7-and-8/The issues to be addressed in the current project are: Compatible with IOS7 and iOS8, previous versions do not require support for Implementation compatible with 3.5, 4, 4.7 and 5.5 inch screens, vertical screen lauch screen Create the PNG picture you wantFor iphone6/6+ related dimensions see hereThe following size images are required: 1242x2208 for iphone6+, or 1080x1920, or retina HD 5.5 750x1334 for IPhone6,

colored nearby, this causes the image to be blurred (pay attention to the preceding color values ). Therefore, a better solution for image HD problems isDouble Image(@ 2x ). For example, the 200x300 (css pixel) img Tag Requires 400x600 images. In this way, the number of Bitmap pixels is the original4Times, on the retina screen,Number of Bitmap pixelsYou canNumber of physical pixelsFormation1 : 1The image is naturally clear (this also explains a probl

NBSP; xmlns:android = " Http://schemas.android.com/apk/res/android " android:layout_width= "Match_parent" android:layout_height= "Match_parent" android:orientation= "Horizental" android:background= "@color/white" >Android:width= "Match_parent"android:height= "Wrap_content"Android:weight= "1.0"android:text= "Button1"/> Android:width= "Match_parent"android:height= "Wrap_content"Android:weight= "2.0"android:text= "Button1"/>The above definition is in the form of setting the p

used1. The size of the 640*960 4 era, just touch the app design is this size, the era of quasi-material prevalence (now with this size design should be relatively few bar);2. 640*1136 5/5s/5c,iphone Update, we have to follow the design with the times (should still be used in this design size), into the flat era;3. 750*1334 6 At present I do design draft design size, IPhone6 size, down can be adapted to 4, 5, upward can be adapted to 6 Plus; I remember IP6 after the launch, I asked the director

sockaddr_in sin;Struct sockaddr SA;Struct ifreq IFR;Unsigned char Mac [6];Sock = socket (af_inet, sock_dgram, 0 );If (sock =-1){Perror ("socket ");Return-1;}Strncpy (IFR. ifr_name, eth_name, ifnamsiz );IFR. ifr_name [ifnamsiz-1] = 0;Memset (MAC, 0, sizeof (MAC ));If (IOCTL (sock, siocgifhwaddr, IFR) {Perror ("IOCTL ");Return-1;} Memcpy ( SA, IFR. ifr_addr, sizeof (SIN ));Memcpy (MAC, SA. sa_data, 6 );Sprintf (vmac, "%. 2x: %.

object is not already in the cache, this method loads the image data from the specified file, caches it, and thenReturns the resulting object. On a device running IOS 4 or later, the behavior is identical if the device's screen has a scale1.0. If the screen has a scale2.0, This method first searches for an image file with the same filename with@2xSuffix appended to it. For example, if the file's name isbutton, It first searchesbutton@2x. If it finds

taught us "Newton iterative method to quickly find the square root", or this method can help us. The specific steps are as follows: Obtain the approximate value of root number A: first, just guess an approximate value of X, and then make X equal to the average of x and A/X. After six or seven iterations, the value of X is quite accurate.For example, I want to calculate the value of Root 2. If I guess the result is 4, although the error is outrageous, you can see that after using the Newton iter

# size(MB) block start # block count partition_Id \n");if ( (partInfo[0].block_start !=0) (partInfo[0].block_count != 0) ) printf(" 1 %6d %8d %8d 0x%.2X \n",(partInfo[0].block_count / 2048), partInfo[0].block_start,partInfo[0].block_count, partInfo[0].partitionId);if ( (partInfo[1].block_start !=0) (partInfo[1].block_count != 0) ) printf(" 2 %6d %8d %8d 0x%.