August 30, 2008 03:18am pdt

Member Login

Hall of Fame

Yearly

1aneeshch... 494,660
2julianopolito 342,910
3Zeffer 242,345
4tagit 225,110
5blue-genie 220,130
6Vulturous 160,550
7CyanBlue 96,152
8kishoregp 94,097
9SamuelRo... 88,299
10crooksy88 87,510
11ugeb 74,275
12dreamjay 58,864
13FLAASHER 54,700
14najh 45,150
15jason1178 43,025
16trigger-h... 41,390
17sibgig 38,050
18asaivan 35,000
19hobbit72 34,900
20BongoMo... 33,800
21Dreammo... 30,500
22Rouchie 29,650
23grafinery 29,300
24ddlam 28,640
25Dushan911 23,395

	[x] Attachment Details

convert long and lat to X, Y coordinates

Zones: Macromedia Flash, Scripting Languages

Tags: Flash ActionScript

I'm a newbie to flash. I have a map (mercator projection) and I would like to convert the long, lat to X and Y coordinates, attach the map to the stage, scale down the map to 30% of the original size and clip the map to the coordinates on the stage X:0, Y:82, W:670, H:490 The map width is 2860, height is 1900.
Then I would like zoom the map to the North Sea 56° 02 03 N, 3° 02 03 E and plot locations there. I have the long and lat values of the locatiion (as 2 values NOT 4) and I have found a function to convert to X, Y.

The map long and lat are SW(40.3130432088809, -44.6484375);NE(76.72022329036133, 74.00390625)

I have tried the code below to get the X and Y coordinates but I get unrealistic Y value. I also used a code I found on the site to clip the map to the coordinates but can't figure how to get it to work

         
           
             1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:

           
           
             this._lockroot = true;
 
//MAP SIZE
var xwidth:Number = 2860;
var yheight:Number = 1900;
 
//MAP COORDINATES
var longN:Number = 76.7;  //Y1:0
var latW:Number = 74.0;   //X1:0
var longS:Number = 40.3;  //map helght Y2
var latE:Number = -44.6;  //map width   X2
 
//CONVERT MAP LONG, LAT TO X,Y COORDINATES
var x:Number;
var y:Number;
x = xwidth/(latE-latW);
y = yheight/(longN-longS);
trace("map x: " + x);
trace("map y: " + y);
 
function zoomClipToCoordinates(clip, top, left, bottom, right) {
      var zoomWidth:Number = 670;  //right minus left
      var zoomHeight:Number = 488; //bottom - top;
      var clipWidth = xwidth / (30/ 100);
      var clipHeight = yheight / (30 /100);
	  
      if (zoomWidth <= 0 || zoomHeight <= 0) return false;
	  
      //Zoom to the correct portion of the clip
      xwidth = Stage.width * (clipWidth / zoomWidth);
      xheight = Stage.height * (clipHeight / zoomHeight);
	  
      //Position the clip to the top and left coordinates provided
      clip._x = 0 - (left * (xwidth / clipWidth))
      clip._y = 0 - (top * (yheight / clipHeight))
}
           
         

Attachments:

zoomLevel1.png (276 KB) (File Type Details)

map

Start your free trial to view this solution

[x]

The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

The Grade of the Solution
The Zone Rank of the Expert Providing the Solution
The Number of Author and Expert Comments
The Number of Experts Contributing
The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

6.1

Question Stats

Zone: Software

Question Asked By: mbjorge

Solution Provided By: ugeb

Participating Experts: 1

Solution Grade: B

Translate:

Loading Advertisement...

20080723-EE-VQP-34 / EE_QW_2_20070628