优化VT中截取瓦片的算法。

chenmeiyiSupermap · chenmeiyiSupermap · commit 75d2ca0031b8 · 2017-07-31T14:23:44.000+08:00
diff --git a/examples-test/base/commonTools.js b/examples-test/base/commonTools.js
@@ -1,8 +1,7 @@
-var fs = require('fs'),
-    PNG = require('pngjs').PNG;
+var fs = require('fs');
+var path = require('path');
 var getPixels = require("get-pixels");
 var assert = require('assert');
-var path = require('path');
 var images = require('images');
 
 var commonTools = ({
@@ -92,13 +91,8 @@ var commonTools = ({
          * function: get a tile with certain range from the screenshot
          * */
         getTileFromScreenshot: function (sourceImagePath, offsetX, offsetY, width, height, tilePath) {
-            var dst = new PNG({width: width, height: height});
-            fs.createReadStream(sourceImagePath)
-                .pipe(new PNG())
-                .on('parsed', function () {
-                    this.bitblt(dst, offsetX, offsetY, width, height, 0, 0);
-                    dst.pack().pipe(fs.createWriteStream(tilePath));
-                });
+            images(images(sourceImagePath), offsetX, offsetY, width, height)
+                .save(tilePath);
         },
 
         /*
diff --git a/package.json b/package.json
@@ -73,7 +73,6 @@
     "mapv": "2.0.14",
     "nightwatch": "^0.9.5",
     "openlayers": "4.2.0",
-    "pngjs": "^3.2.0",
     "selenium-server": "^2.53.1",
     "shelljs": "^0.7.6",
     "style-loader": "^0.13.1",
