I am currently trying to update our mobile map viewer (Kaliopa Mapguide
Mobile Viewer) from OL2 to OL3.
I found there is no display problems for mapguide layer on the desktop
browsing.
However, when I zoomed in higher zoom levels on the mobile devices, the
features on the mapguide layers such as points, labels, and lines are
displayed so small.
I tried to use the custom resolutions array for mobile devices, and it works
as following:
var DesktopResolutions = [156543.03390625, 78271.516953125,
39135.7584765625,
19567.87923828125, 9783.939619140625, 4891.9698095703125,
2445.9849047851562, 1222.9924523925781, 611.4962261962891,
305.74811309814453, 152.87405654907226, 76.43702827453613,
38.218514137268066, 19.109257068634033, 9.554628534317017,
4.777314267158508, 2.388657133579254, 1.194328566789627,
0.5971642833948135, 0.2986, 0.1493];
var MobileResolutions = [156543.03390625, 78271.516953125,
39135.7584765625,
19567.87923828125, 9783.939619140625, 4891.9698095703125,
2445.9849047851562, 1222.9924523925781, 611.4962261962891,
305.74811309814453, 152.87405654907226, 76.43702827453613,
38.218514137268066, 19.109257068634033, 9.554628534317017,
4.777314267158508, 2.388657133579254, 1.194328566789627,
0.5971642833948135];
var mgLayerSource = new ol.source.ImageMapGuide({
projection: 'EPSG:3857',
url: agentUrl,
useOverlay: true,
hidpi: true,
metersPerUnit: metersPerUnit,
displayDpi: DPI, // default 96
units: unitsType,
ratio: 1,
resolutions: (isMobile ? MobileResolutions : DesktopResolutions),
params: {
mapName: mapName,
session: sessionId,
selectioncolor: selectionColor,
behavior: 2,
locale: locale,
VERSION: "2.1.0",
clientagent: clientAgent,
format: 'PNG',
showGroups: '',
hideGroups: '',
showLayers: '',
hideLayers: ''
}
});
mgLayer = new ol.layer.Image({
title: 'Mapguide Layer',
extent: bounds,
source: mgLayerSource
});
It works to show larger features, but won't refresh the mapguide layer when
I zoom over zoom level 18.
Therefore, I don't like the solution above.
Then, I found out that if I change the display DPI, it will work just fine
on most of the devices.
displayDpi: (isMobile ? 300: DPI),
units: unitsType,
ratio: 1,
//resolutions: (isMobile ? MobileResolutions : DesktopResolutions),
Hope this help someone works on the similar projects, or please let me know
if there are more responsive solutions.
Thanks a lot!
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