alignment

问题 I need to know how to calculate the positions of the QR Code alignment patterns as defined in the table of ISO/IEC 18004:2000 Annex E. I don't understand how it's calculated. If you take the Version 16, for example, the positions are calculated using {6,26,50,74} and distance between the points are {20,24,24}. Why isn't it {6,28,52,74}, if the distances between the points, {22,24,22}, is distributed more equally? I would like to know how this can be generated procedurally. 回答1: While the

问题 +--------------------------------------------+ | +-------+ +----------+| | | +---+ | | +-----+ || | | | A | | | | B | || | | +---+ | | +-----+ || | +-------+ +----------+| +--------------------------------------------+ ^ | | Center Background: I have a JButton ("A"), size 50x25, within a JPanel (FlowLayout.CENTER) a JLabel ("B"), size 100x25, within a JPanel (FlowLayout.RIGHT) the two JPanels are in a JPanel Desired Result: I want The JButton "A" to always be centered horizontally, The JLabel

问题 I need your help at understanding how bit fields work in C programming. I have declared this struct: struct message { unsigned char first_char : 6; unsigned char second_char : 6; unsigned char third_char : 6; unsigned char fourth_char : 6; unsigned char fifth_char : 6; unsigned char sixth_char : 6; unsigned char seventh_char : 6; unsigned char eigth_char : 6; }__packed message; I saved the size of the struct into an integer using sizeof(message). I thought the value of the size will be 6

问题 char arr[512] = {0}; int *ptr = (int *)arr; // WRONG // A bus error can be caused by unaligned memory access printf("%d\n", *ptr); On the other hand: The block that malloc gives you is guaranteed to be aligned so that it can hold any type of data. char *arr= malloc(512); int *ptr = (int *)arr; // OK, arr is properly aligned for ptr memset(arr, 0, 512); printf("%d\n", *ptr); Is this assumption correct or am I missing something? 回答1: The C standard guarantees that malloc will return memory

问题 The language I'm using is R, but you don't necessarily need to know about R to answer the question. Question: I have a sequence that can be considered the ground truth, and another sequence that is a shifted version of the first, with some missing values. I'd like to know how to align the two. setup I have a sequence ground.truth that is basically a set of times: ground.truth <- rep( seq(1,by=4,length.out=10), 5 ) + rep( seq(0,length.out=5,by=4*10+30), each=10 ) Think of ground.truth as times

问题 I'm learning how to work with struct s in C and wrote the following example: #include <stdio.h> #include <stdlib.h> struct s1{ unsigned short member; }; int main() { struct s1 *s1_ptr = malloc(sizeof(*s1_ptr)); s1_ptr -> member = 10; printf("Member = %d\n", *s1_ptr); // Member = 10 } QUESTION: Is it guaranteed that in all cases a pointer to a struct is a exactly the same pointer to its first element? In this particular case it works as I expected, but I'm not sure if it is guaranteed. Is

问题 Please tell me how can I align center to my ListBox's text in desktop application. I am using C#.Net in Visual Studio 2005. I am using Windows forms. 回答1: You can set the DrawMode property of the ListBox to DrawMode.OwnerDrawFixed , which gives you control over the entire graphical representation of each item. For instance: ListBox listBox = new ListBox(); listBox.DrawMode = DrawMode.OwnerDrawFixed; listBox.DrawItem += new DrawItemEventHandler(listBox_DrawItem); void listBox_DrawItem(object

问题 I'm trying to display on one line: a H1 element aligned to the left of the containing box several "buttons" (A elements here) aligned to the right of the containing box all being on the same baseline Is it possible to do this with minimal markup (i.e. no wrapping elements) and without having to set precise heights, line-heights, margin-tops, etc. <div id="block1"> <h1>What a great title</h1> <a href="javascript:void(0)">This link can kill you</a> <a href="javascript:void(0)">Click if you dare

问题 I need to apply a TextWrapping in the WPF CheckBox . Please look at this two samples: <CheckBox> <TextBlock TextWrapping="Wrap" Text="_This is a long piece of text attached to a checkbox."/> </CheckBox> <CheckBox> <AccessText TextWrapping="Wrap" Text="_This is a long piece of text attached to a checkbox."/> </CheckBox> If I use a TextBlock in the Content of the CheckBox , the check element (vertical alignment is top) and the text displays properly, but not the accelerator. If I use an

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . What is a good method to align images together that may have different rotations, exposures, etc, but have the same background or