Fix mouse events on overzoomed canvas tiles #252
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When using maxZoom and maxNativeZoom to "overzoom" tiles to higher zoom levels, the existing Canvas.Tile logic incorrectly calculates where the mouse is within the tile, because it does not scale the real pixels to the canvas' pixels, which are now 2, 4, 8, etc times larger. This means that features cannot be hovered or clicked on. This commit adds logic to scale offsets and mouse locations according to the overzoom factor, which restores the behavior of non-overzoomed tiles.
grid-100
approved these changes
Jan 5, 2021
grid-100
approved these changes
Jan 5, 2021
mspi92
reviewed
Jan 20, 2022
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| getOverZoomFactor: function() { | ||
| var numberOfZoomLevels = Math.max(0, this._map.getZoom() - this._tileCoord.z); |
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There is a case in leaflet fractional zooming where the tiles are "underzoomed".
So this._map.getZoom() is smaller than _tileCoord.z.
By Removing the "0"-Limit "underzoomed" cases will work as well.
Suggested change
| var numberOfZoomLevels = Math.max(0, this._map.getZoom() - this._tileCoord.z); | |
| var numberOfZoomLevels = this._map.getZoom() - this._tileCoord.z; |
This Case happens when using zoomSnap of 0.25. Fractions < 0.5 take overzoom, Fractions >= 0.5 underzoom
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When using maxZoom and maxNativeZoom to "overzoom" tiles to higher zoom levels, the existing Canvas.Tile logic incorrectly calculates where the mouse is within the tile, because it does not scale the real pixels to the canvas' pixels, which are now 2, 4, 8, etc times larger. This means that features cannot be hovered or clicked on.
This commit adds logic to scale offsets and mouse locations according to the overzoom factor, which restores the behavior of non-overzoomed tiles.