Hello,

I made some changes:

• When you near the mouse to a point, name appears bottom left corner.
• When you press and hold (!) mouse, line appears.

For the points I made an array. The name are separate. Later you want an object "FriendPosition" where you store point and name together.

Greetings, Chrisir

1. //  see http://forum.processing.org/topic/interactive-map-problems
2. //
3. PImage backgroundMap;
4. float mapGeoLeft   = -100;          // Longitude 125 degrees west
5. float mapGeoRight  =  153.44;          // Longitude 153 degrees east
6. float mapGeoTop    =   71.89;          // Latitude 72 degrees north.
7. float mapGeoBottom =  -80;          // Latitude 56 degrees south.
8. float mapScreenWidth, mapScreenHeight;  // Dimension of map in pixels.
9. // array
10. PVector[] mapPoints = new PVector [33];
11. boolean mouseHold=false;
12. //
13. void setup()
14. {
15.   size(600, 350);
16.   textSize(10);
17.   smooth();
18.   // noLoop();
19.   backgroundMap  = loadImage("world.jpg");
20.   mapScreenWidth  = width;
21.   mapScreenHeight = height;
22. }
23. void draw()
24. {
25.   background(0);
26.   //image(backgroundMap, 0, 0, mapScreenWidth, mapScreenHeight);
27.   stroke(204, 102, 0);
28.   fill(255, 150);
29.   strokeWeight(1);
30.   PVector p = geoToPixel(new PVector(0.8, 51.5)); 
31.   ellipse(p.x, p.y, 5, 5);
32.   mapPoints[0]=p;
33.   p = geoToPixel(new PVector(-82.0, 39.5));   
34.   ellipse(p.x, p.y, 5, 5);
35.   mapPoints[1]=p;
36.   //
37.   if (dist(mapPoints[0].x, mapPoints[0].y, mouseX, mouseY) < 20 ) {
38.     fill(255);
39.     text("Fred", 20, height-40);
40.   }
41.   else if (dist(mapPoints[1].x, mapPoints[1].y, mouseX, mouseY) < 20 ) {
42.     fill(255);
43.     text("Anna", 20, height-40);
44.   }
45.   if (mouseHold) {
46.     stroke(255);
47.     line(mapPoints[0].x, mapPoints[0].y, mouseX, mouseY);
48.   }
49. }
50. void mousePressed() {
51.   mouseHold=true;
52. }
53. void mouseReleased() {
54.   mouseHold=false;
55. }
56. public PVector geoToPixel(PVector geoLocation)
57. {
58.   return new PVector(mapScreenWidth*(geoLocation.x-mapGeoLeft)/(mapGeoRight-mapGeoLeft),
59.   mapScreenHeight - mapScreenHeight*(geoLocation.y-mapGeoBottom)/(mapGeoTop-mapGeoBottom));
60. }