The sample that i find is made using v2 of API. I want to try to rewrite it for v3 because i like the idea of an object child of parallel line but with the possibility to add an offset to paint like a parallel of other poly. I think to add something to change the thickness with the zoom. I will try it to see results in velocity and effects
thank for help! On 8 jul, 12:43, Ben Appleton <[email protected]> wrote: > In traffic they use parallel lines, but these are rendered as image tiles by > a server. I would be curious to see how fast parallel lines could be in > javascript. You may want to try changing your polyline coordinates on map > event zoom_changed. > > On 8 Jul 2010 19:38, "Enrico" <[email protected]> wrote: > > > > > Thank you for your fast reply Ben, > > > I think that the solution of black poly is easy but I try it in a > > small page that I have in local to pick the coords of polyline paths, > > and when I have a closest zoom the two lines are too far and not seem > > a two directions streets. furthermore if i use a large zoom, they > > merge into 1 (and the black separator is over the only that I see). > > > I see that it's possible to trigger the change zoom level on map, so I > > think to control it and change the thickness of lines or change the > > offset, but y have a lot of small polyline (like traffic, each one > > with different color) and i must change all. I think in an array of > > polyline and a for to change alls, but it seems a very expansive > > process... > > > I just find an example of drawing parallel lines (http:// > > wtp2.appspot.com/ParallelLines.htm) and I think that i can use the > > alghoritm to calculate the coords of one of two polylines every time > > that i change zoom. I think it can work but it seems more expansive > > that the other. > > > In traffic seems that they use polygons, not polyline, but seems that > > they can control the thickness. > > Any idea? > > > Thank! > > > On 8 jul, 10:50, Ben Appleton <[email protected]> wrote: > >> It sounds like you need your 2 Polylines to stay a minimum distance apart > as > >> you zoom out, so they don't merge into 1 line. A simple hack would be to > >> render a thin opaque black Polyline down the middle of the road with a > >> higher zIndex - that would divide the 2 Polylines. Another alternative > >> would be to offset the 2 Polylines in JS, but that would be complex and > >> slower. > > >> Good luck! > >> Ben > > >> On 8 Jul 2010 18:28, "Enrico" <[email protected]> wrote: > >> Hi, > >> I start to play with API v3 and I have a conceptual problem: > >> I need something like traffic overlay but with own data. > >> Basically I need to print two line (one for every direction of a > >> street) and dynamically change the color. > > >> The main problem is what can I use for this: polyline or polygons? > >> - with polyline the thickness of it is the same in every zoom level > >> so, if i see two lines in zoom level 8, i see only one on 15 because > >> they are overlapped. > >> - with polygon on zoom 15 (f.e.) i can't see them because are too > >> small (i try to print a path with thickness 1 and printed like a > >> street) > > >> I try to understand what use google in traffic but I can't. > > >> Any help? > > >> I will use javascript API v3 > > >> Thank! > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Google Maps JavaScript API v3" group. > >> To post to this group, send email to > > [email protected].>> To unsubscribe from this group, > send email to > >> [email protected]<google-maps-js-api-v3%2B > >> [email protected]><google-maps-js-api-v3%2B > > [email protected]>>> . > >> For more options, visit this group athttp:// > > groups.google.com/group/google-maps-js-api-v3?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google Maps JavaScript API v3" group.> To post to this group, send email to > > [email protected].> To unsubscribe from this group, send > email to > > [email protected]<google-maps-js-api-v3%2B > [email protected]> > .> For more options, visit this group at > > http://groups.google.com/group/google-maps-js-api-v3?hl=en. > > > > -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
