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Position tiles by offset instead of extent

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ahocevar
2018-11-14 20:53:28 +01:00
committed by Tim Schaub
parent 6edac64b81
commit 9a4e665c3b
1 changed files with 8 additions and 4 deletions
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src/ol/renderer/canvas/TileLayer.js
+8 -4
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@@ -4,7 +4,7 @@
import {getUid} from '../../util.js'; import {getUid} from '../../util.js';
import TileRange from '../../TileRange.js'; import TileRange from '../../TileRange.js';
import TileState from '../../TileState.js'; import TileState from '../../TileState.js';
import {createEmpty, getIntersection} from '../../extent.js'; import {createEmpty, getIntersection, getTopLeft} from '../../extent.js';
import {createCanvasContext2D} from '../../dom.js'; import {createCanvasContext2D} from '../../dom.js';
import CanvasLayerRenderer from './Layer.js'; import CanvasLayerRenderer from './Layer.js';
import {create as createTransform, compose as composeTransform} from '../../transform.js'; import {create as createTransform, compose as composeTransform} from '../../transform.js';
@@ -266,13 +266,17 @@ class CanvasTileLayerRenderer extends CanvasLayerRenderer {
const currentScale = currentResolution / tileResolution; const currentScale = currentResolution / tileResolution;
const w = currentTilePixelSize[0] * currentScale; const w = currentTilePixelSize[0] * currentScale;
const h = currentTilePixelSize[1] * currentScale; const h = currentTilePixelSize[1] * currentScale;
const originTileCoord = tileGrid.getTileCoordForCoordAndZ(getTopLeft(canvasExtent), currentZ);
const originTileExtent = tileGrid.getTileCoordExtent(originTileCoord);
const originX = Math.round(tilePixelRatio * (originTileExtent[0] - canvasExtent[0]) / tileResolution);
const originY = Math.round(tilePixelRatio * (canvasExtent[3] - originTileExtent[3]) / tileResolution);
const tileGutter = tilePixelRatio * tileSource.getGutterForProjection(projection); const tileGutter = tilePixelRatio * tileSource.getGutterForProjection(projection);
const tilesToDraw = tilesToDrawByZ[currentZ]; const tilesToDraw = tilesToDrawByZ[currentZ];
for (const tileCoordKey in tilesToDraw) { for (const tileCoordKey in tilesToDraw) {
const tile = tilesToDraw[tileCoordKey]; const tile = tilesToDraw[tileCoordKey];
const tileExtent = tileGrid.getTileCoordExtent(tile.getTileCoord(), tmpExtent); const tileCoord = tile.tileCoord;
const x = Math.round(tilePixelRatio * (tileExtent[0] - canvasExtent[0]) / tileResolution); const x = originX - (originTileCoord[1] - tileCoord[1]) * w;
const y = Math.round(tilePixelRatio * (canvasExtent[3] - tileExtent[3]) / tileResolution); const y = originY + (originTileCoord[2] - tileCoord[2]) * h;
this.drawTileImage(tile, frameState, layerState, x, y, w, h, tileGutter, z === currentZ); this.drawTileImage(tile, frameState, layerState, x, y, w, h, tileGutter, z === currentZ);
this.renderedTiles.push(tile); this.renderedTiles.push(tile);
} }