area | 易学教程

Connected Component Labelling

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I have asked a similar question some days ago, but I have yet to find an efficient way of solving my problem. I'm developing a simple console game, and I have a 2D array like this: 1,0,0,0,1 1,1,0,1,1 0,1,0,0,1 1,1,1,1,0 0,0,0,1,0 I am trying to find all the areas that consist of neighboring 1's (4-way connectivity). So, in this example the 2 areas are as following: 1 1,1 1 1,1,1,1 1 and : 1 1,1 1 The algorithm, that I've been working on, finds all the neighbors of the neighbors of a cell and works perfectly fine on this kind of matrices. However, when I use bigger arrays (like 90*90) the

Highlight parts of matlab plot

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问题 I have a matlab plot that looks like this: Where the Y values for each of the subplots are stored in single dimensional arrays. What i would like to do is to find an area where the top graph is above a certain height say 0.5. I would also like to highlight the same area in the other graphs as well. Here is an example of what I am talking about: The best i have been able to find so far is the function area which will fill an area on the matlab grid. However, if someone could tell me how to

Cursor not changing to pointer in Usemap/area case

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问题 I have the following HTML code which I cannot get to work quite right in all browsers: <div id ="right_header"> <img id = "usemapsignin" src="/images/sign-in-panel-wo-FB.png" usemap = "#signin"> </div> <map name = "signin" > <area shape = "rect" coords = "30,10, 150, 50" target = "_blank" alt = "signin" id="signin" onMouseOver="document.images['usemapsignin'].style.cursor='pointer'" onMouseOut="document.images['usemapsignin'].style.cursor='auto'"/> <area shape = "rect" coords = "0,113, 172,

Apply css to AREA MAP

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I'm created a very large map with many poly areas (over 20 coordinates each) for regions within the map. However, you can't add css to the AREA tag as I was told it's not a visible element. What I want to do is when the user hovers over an area on the map, I want it to be "highlighted" by applying a 1px border to the specific AREA element. Is there a way of doing this? No, I'm not going to resort using rectangles. If you want to be able to use arbitrary shapes and still use styles, have you considered trying SVG? I'm not an SVG master but here's an example I whipped up: http://jsfiddle.net

Calculate Earth convex hull polygon area given latitude and longitude

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问题 I have searched for explanations and algorhitms how to calculate Earth's polygon surface area. I've found this and this Lets say I got already convex hull points [56.992666,24.126051], [58.00282,25.930147], [58.787955,25.565078], [59.4997,24.861427], [59.463678,24.711365], [59.395767,24.599837], [56.992666,24.126051] From second link the first answers uses Python library and second answer approach won't give quite precise area even if we assume that Earth is sphere (am I right)? What

Mvc area routing?

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问题 Area folders look like : Areas Admin Controllers UserController BranchController AdminHomeController Project directories look like : Controller UserController GetAllUsers area route registration public override void RegisterArea(AreaRegistrationContext context) { context.MapRoute( "Admin_default", "Admin/{controller}/{action}/{id}", new { action = "Index", id = UrlParameter.Optional }, new { controller = "Branch|AdminHome|User" } ); } project route registration public static void

Check if a latitude and longitude is within a circle

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问题 See this illustration: What I would like to know is: How to create an area (circle) when given a latitude and longitude and the distance (10 kilometers) How to check (calculate) if a latitude and longitude is either inside or outside the area I would prefer if you can give me code example in Java or specifically for Android with Google Maps API V2 回答1: What you basically need, is the distance between two points on the map: float[] results = new float[1]; Location.distanceBetween

can i have an onclick event on a imagemap area element

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问题 I would like to put an onclick event on an area element. Here is my setup: <img id="image" src="wheel.png" width="2795" height="2795" usemap="#Map" > <map name="Map"> <area class="blue" onclick="myFunction()" shape="poly" coords="2318,480,1510,1284" href="#"> </map> I have tried 2 different ways to have an onclick event. Firstly i tried this: $(".blue").click( function(event){ alert('test'); }); I have also tried this: function myFunction() { alert('test'); } Neither of the above work. Do

Select an area to capture using the mouse

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问题 I'm making a Java based screen shot application, and I want to make it so when you push a combination of keys on your keyboard something like this video happens where you select and area on your screen, and it takes a screen shot of the selected area. How to select an area to capture using the mouse? 回答1: Start with something like this. import java.awt.*; import java.awt.event.*; import java.awt.image.*; import javax.swing.*; /** Getting a Rectangle of interest on the screen. Requires the

Connected Component Labeling - Implementation

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问题 I have asked a similar question some days ago, but I have yet to find an efficient way of solving my problem. I\'m developing a simple console game, and I have a 2D array like this: 1,0,0,0,1 1,1,0,1,1 0,1,0,0,1 1,1,1,1,0 0,0,0,1,0 I am trying to find all the areas that consist of neighboring 1\'s (4-way connectivity). So, in this example the 2 areas are as following: 1 1,1 1 1,1,1,1 1 and : 1 1,1 1 The algorithm, that I\'ve been working on, finds all the neighbors of the neighbors of a cell