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Working with integer pixel space.

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This commit is contained in:
Tim Schaub
2012-07-07 15:19:49 -06:00
parent 523f4d61fc
commit c0777cc003
1 changed files with 20 additions and 20 deletions
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40
src/ol/renderer/TileLayerRenderer.js
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@@ -156,37 +156,37 @@ ol.renderer.TileLayerRenderer.prototype.draw = function(center, resolution) {
var centerX = center.getX();
var centerY = center.getY();
// calculate vector from tile origin to map top-left (in pixel space)
// calculate vector from tile origin to map top-left (in integer pixel space)
var tileOrigin = this.tileOrigin_;
var mapOrigin = [centerX - halfMapWidth, centerY + halfMapHeight];
var pxMap = [
(mapOrigin[0] - tileOrigin[0]) / resolution,
(tileOrigin[1] - mapOrigin[1]) / resolution
Math.round((mapOrigin[0] - tileOrigin[0]) / resolution),
Math.round((tileOrigin[1] - mapOrigin[1]) / resolution)
];
// desired tile size in fractional pixels
var pxTileWidth = this.tileSize_[0] / scale;
var pxTileHeight = this.tileSize_[1] / scale;
var fpxTileWidth = this.tileSize_[0] / scale;
var fpxTileHeight = this.tileSize_[1] / scale;
// calculate vector from tile origin to top-left tile (in pixel space)
var colsLeft = Math.floor(pxMap[0] / pxTileWidth);
var rowsAbove = Math.floor(pxMap[1] / pxTileHeight);
var pxTile = [colsLeft * pxTileWidth, rowsAbove * pxTileHeight];
// calculate vector from tile origin to top-left tile (in integer pixel space)
var colsLeft = Math.floor(pxMap[0] / fpxTileWidth);
var rowsAbove = Math.floor(pxMap[1] / fpxTileHeight);
var pxTile = [Math.round(colsLeft * fpxTileWidth), Math.round(rowsAbove * fpxTileHeight)];
// offset vector from container origin to top-left tile (in pixel space)
var pxOffsetX = pxTile[0] - pxMap[0] - this.containerOffset_.x;
var pxOffsetY = pxTile[1] - pxMap[1] - this.containerOffset_.y;
// offset vector from container origin to top-left tile (in integer pixel space)
var pxOffsetX = Math.round(pxTile[0] - pxMap[0] - this.containerOffset_.x);
var pxOffsetY = Math.round(pxTile[1] - pxMap[1] - this.containerOffset_.y);
// index of the top left tile
var leftTileX = xRight ? colsLeft : (-colsLeft - 1);
var topTileY = yDown ? rowsAbove : (-rowsAbove - 1);
var numTilesWide = Math.ceil(containerSize.width / pxTileWidth);
var numTilesHigh = Math.ceil(containerSize.height / pxTileHeight);
if (pxOffsetX !== 0) {
var numTilesWide = Math.ceil(containerSize.width / fpxTileWidth);
var numTilesHigh = Math.ceil(containerSize.height / fpxTileHeight);
if (this.containerOffset_.x !== -pxOffsetX) {
numTilesWide += 1;
}
if (pxOffsetY !== 0) {
if (this.containerOffset_.y !== -pxOffsetY) {
numTilesHigh += 1;
}
@@ -201,18 +201,18 @@ ol.renderer.TileLayerRenderer.prototype.draw = function(center, resolution) {
pxTileTop = pxMinY;
tileX = xRight ? leftTileX + i : leftTileX - i;
if (scale !== 1) {
pxTileRight = Math.round(pxMinX + ((i+1) * pxTileWidth));
pxTileRight = Math.round(pxMinX + ((i+1) * fpxTileWidth));
} else {
pxTileRight = pxTileLeft + pxTileWidth;
pxTileRight = pxTileLeft + fpxTileWidth;
}
for (var j=0; j<numTilesHigh; ++j) {
append = false;
tileY = yDown ? topTileY + j : topTile - j;
xyz = tileX + "," + tileY + "," + tileZ;
if (scale !== 1) {
pxTileBottom = Math.round(pxMinY + ((j+1) * pxTileHeight));
pxTileBottom = Math.round(pxMinY + ((j+1) * fpxTileHeight));
} else {
pxTileBottom = pxTileTop + pxTileHeight;
pxTileBottom = pxTileTop + fpxTileHeight;
}
img = null;
tile = this.renderedTiles_[xyz];