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Support fractional zoom levels in ol.View#getZoom and #setZoom

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This commit is contained in:
Andreas Hocevar
2016-08-02 22:52:57 +02:00
parent 3d57ea45cb
commit 98fbfe4b67
3 changed files with 67 additions and 29 deletions
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17
src/ol/resolutionconstraint.js
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@@ -21,7 +21,13 @@ ol.ResolutionConstraint.createSnapToResolutions = function(resolutions) {
var z =
ol.array.linearFindNearest(resolutions, resolution, direction);
z = ol.math.clamp(z + delta, 0, resolutions.length - 1);
return resolutions[z];
var index = Math.floor(z);
if (z != index && index < resolutions.length - 1) {
var power = resolutions[index] / resolutions[index + 1];
return resolutions[index] / Math.pow(power, z - index);
} else {
return resolutions[index];
}
} else {
return undefined;
}
@@ -45,14 +51,7 @@ ol.ResolutionConstraint.createSnapToPower = function(power, maxResolution, opt_m
*/
function(resolution, delta, direction) {
if (resolution !== undefined) {
var offset;
if (direction > 0) {
offset = 0;
} else if (direction < 0) {
offset = 1;
} else {
offset = 0.5;
}
var offset = -direction / 2 + 0.5;
var oldLevel = Math.floor(
Math.log(maxResolution / resolution) / Math.log(power) + offset);
var newLevel = Math.max(oldLevel + delta, 0);