center

问题 I am trying to place a div element over a canvas (it is for a game) on the center of my page. It is about a startscreen that I want to show over the canvas, before starting the game(this startscreen has options like "Play game", "Settings" etc). The problem is that I cannnot get this done, I have searched a lot on Google, I have seen a lot of examples, but none of them seems to be working for me. Here is my code: <div id="gamecontainer"> <canvas id="myCanvas" width="800" height="600"> Sorry,

问题 I am trying to place a div element over a canvas (it is for a game) on the center of my page. It is about a startscreen that I want to show over the canvas, before starting the game(this startscreen has options like "Play game", "Settings" etc). The problem is that I cannnot get this done, I have searched a lot on Google, I have seen a lot of examples, but none of them seems to be working for me. Here is my code: <div id="gamecontainer"> <canvas id="myCanvas" width="800" height="600"> Sorry,

问题 Currently I have this JComboBox , how can I get to center the content inside it? String[] strs = new String[]{"15158133110", "15158133124", "15158133458"}; JComboBox com = new JComboBox(strs); 回答1: You need to create a Renderer then apply it to the JComboBox DefaultListCellRenderer dlcr = new DefaultListCellRenderer(); dlcr.setHorizontalAlignment(DefaultListCellRenderer.CENTER); com.setRenderer(dlcr); also import this, import javax.swing.DefaultListCellRenderer; 回答2: ((JLabel)jComboBox1

问题 I'm using the centroid of polygons to attach a marker in a map application. This works definitely fine for convex polygons and quite good for many concave polygons. However, some polygons (banana, donut) obviously don't produce the desired result: The centroid is in these cases outside the polygons area. Does anybody know a better approach to find a suitable point within any polygons area (which may contain holes!) to attach a marker? 回答1: One approach would be to generate and refine a

问题 I'm trying to have two UILabels in my navigation bar instead of just one. I followed this link to have informations on how to do that: iPhone Title and Subtitle in Navigation Bar It works well, but I can't get my texts to be centered properly. It is centered between the buttons, but the default title behaviour is to center itself right under the time. I had a look here, same question, but no answer: UINavigationBar TitleView with subtitle What am I missing? Here is my code: CGRect

问题 Given a sticky footer such as that on Ryan Fait's site with a fixed pixel height, is it possible to center, both horizontally and vertically, variable-size content in the space above this footer? 回答1: I would suggest looking at Bobby van der Sluis's article on Footers at A List Apart. Example #7 at the end of his article shows a vertically centered block. It does rely on scripting, but it is truly minimal. edit You can also use a single-cell table to accomplish vertical centering.

问题 I'd like to center an image in a page both vertically and horizontally even when the browser is resized. Currently, I use this CSS: .centeredImage { position: fixed; top: 50%; left: 50%; margin-top: -50px; margin-left: -150px; } And this HTML: <img class="centeredImage" src="images/logo.png"> It centers in FF but not IE (image center is placed at upper left corner). Any ideas? -Robot 回答1: Try using this : position: absolute 回答2: I solved it this way: img.class-name{ position: absolute; margin

问题 I just can't figure out how this works. What I am trying to do is let two players play a game if a third player joins it can instantly join the game, if the fourth and last player joins it can also instantly join the game. They can also leave the game at anytime for whatever reason, if that happens there should be a space open for another person or for the same person to reconnect. That's the idea. Now what I got is the following. I authenticate the local player for obvious reasons. Then I

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: How do I center text horizontally and vertical in a TextView in Android? I have a RelativeLayout (before it was a LinerLayout ), that occupies all the screen and I want to put in the center of this Layout , a TextView . I try to do it with gravity = "center" layout_gravity = "center" and a few more, but it doesn't work. Anybody knows how to center the TextView in the middle of the screen? EDIT Ok, I think I

问题 Perhaps I haven't been searching the right way but I cannot figure out for the life of me how to center an element using GWT Layout Panels. I'm using UiBinder and I've tried all panels that implement HasVerticalAlignment (DockPanel, HorizontalPanel, VerticalPanel). None of them seem to have any impact from setting vertical alignment (or even horizontal). I've made sure they're taking 100% width and height, inspected the resulting DOM layout from my browser and nothing seems to be changed from