[英]How to convert WMS TileLayer to Canvas TileLayer
我正在使用Leaflet将wms tileLayer放置到地图上。 磁贴中的图像没有xyz坐标。
加载图像后,我希望将图像转换为画布。
我尝试了几件事。 将wms tileLayer添加到地图,并在加载时运行脚本以创建画布。 但是,当然,这会使脚本运行太多。 除此之外,我的地图已满载图像,而不是仅在地图上的wms层存在。
它看起来像这样:
this.currentPhoto = L.tileLayer.wms(geoURL), {
layers: layerName,
format: 'image/png',
opacity: 1,
styles: '',
transparent: true,
attribution: "",
version: "2.0.0",
srs: "EPSG:4326"
}).addTo(map).bringToFront();
this.currentPhoto.on('tileload', function(e) {
setCanvasTiles(e);
});
setCanvasTiles: function(e) {
var that = this;
var url = e.url;
var tiles = HKV.satPhotoView.currentPhoto._tiles;
this.canvasTiles = new L.TileLayer.Canvas({
minZoom: 4,
maxZoom: 14,
attribution: '',
tms: true,
opacity: 0.8,
noWrap: true,
unloadInvisibleTiles: true,
reuseTiles: false,
transparent: true
});
this.canvasTiles.drawTile = function(canvas, tilePoint, zoom) {
that.drawCanvasTile(canvas, tilePoint, zoom, url);
};
this.canvasTiles.addTo(this.mapInfo).bringToFront();
},
drawCanvasTile: function(canvas, tilePoint, zoom, url) {
var that = this;
var ctx = canvas.getContext("2d");
var img = new Image();
img.onload = function(){
var height = 256;
var width = 256;
ctx.drawImage(img,0,0);
imageData = ctx.getImageData(0, 0, 256, 256);
$(canvas).data("origImgData",imageData);
//color the pixels of the canvas
};
img.src = url;
},
就像我说的那样,此脚本运行了很多东西,因此我认为最好使用图像的URL和tilePoints构建一个对象,以便将它们与Canvas TileLayer的tilePoints匹配。
外面有人做过这个吗,或者可以帮助我吗?
我正在使用Backbone,require和jquery在传单旁边
我找到了解决方案。 当从wms层请求._tiles时,将有一个带有pixelPosition键的对象。 看起来像:
tiles = {
"127:47": {data},
"127:48": {data},
}
设置画布时,您将收到layerPoints。 使用图层点,我可以从图块中获取图像并使用它。
var newKey = tilePoint.x + ":" + tilePoint.y;
var url = tiles[newKey].src;
所以现在我有了网址。 我可以加载画布。 完整代码在这里:
this.currentPhoto = L.tileLayer.wms(geoURL), {
layers: layerName,
format: 'image/png',
opacity: 1,
styles: '',
transparent: true,
attribution: "",
version: "2.0.0",
srs: "EPSG:4326"
}).addTo(map).bringToFront();
var test = setTimeout(function() {
that.setCanvasTiles();
}, 500);
setCanvasTiles: function() {
var that = this;
var tiles = this.currentPhoto._tiles;
this.canvasTiles = L.tileLayer.canvas({
tms: true,
opacity: 0.8,
noWrap: true,
unloadInvisibleTiles: true,
reuseTiles: false,
transparent: true
});
this.canvasTiles.drawTile = function(canvas, tilePoint, zoom) {
var newKey = tilePoint.x + ":" + tilePoint.y;
var url = tiles[newKey].src;
var ctx = canvas.getContext("2d");
var img = new Image();
img.onload = function(){
var height = 256;
var width = 256;
ctx.drawImage(img,0,0);
var imageData = ctx.getImageData(0, 0, 256, 256);
$(canvas).data("origImgData", imageData);
console.log(imageData);
};
img.src = url;
};
this.canvasTiles.addTo(this.map).bringToFront();
this.map.removeLayer(this.currentPhoto);
},
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