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vendors/echarts/theme/tool/thumb.js

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+var glob = require('glob');
+var Canvas = require('canvas');
+var echarts = require('echarts');
+var fs = require('fs');
+var path = require('path');
+
+require('echarts/map/js/china');
+
+var options = {
+    bar: require('./option/bar'),
+    area: require('./option/area'),
+    scatter: require('./option/scatter'),
+    pie: require('./option/pie'),
+    graph: require('./option/graph'),
+    map: require('./option/map')
+};
+var WIDTH = 600;
+var HEIGHT = 400;
+echarts.setCanvasCreator(function () {
+    return createCanvas();
+});
+
+var font = new Canvas.Font('Helvetica', '/System/Library/Fonts/Helvetica.dfont');
+font.addFace('/System/Library/Fonts/Helvetica.dfont', 'bolder');
+
+glob('../*.js', function (err, themePathList) {
+    themePathList.forEach(function (themePath) {
+        var themeName = path.basename(themePath, '.js');
+        var canvasList = [];
+        require(themePath);
+        echarts.util.each(options, function (option) {
+            var canvas = createCanvas();
+            var chart = echarts.init(canvas, themeName);
+            var optionNeedFix = option;
+            if (option.options) {
+                optionNeedFix = option.options[0];
+            }
+            canvasList.push(canvas);
+            optionNeedFix.animation = false;
+            optionNeedFix.textStyle = {
+                fontFamily: 'Helvetica',
+                fontSize: 12
+            };
+            chart.setOption(option);
+            chart.dispose();
+        });
+
+        var columnCount = 2;
+        var outputCanvas = new Canvas(WIDTH * columnCount, HEIGHT * canvasList.length / columnCount);
+        var outputCtx = outputCanvas.getContext('2d');
+        canvasList.forEach(function (canvas, idx) {
+            outputCtx.drawImage(canvas, idx % columnCount * WIDTH, Math.floor(idx / columnCount) * HEIGHT, WIDTH, HEIGHT);
+        });
+
+        fs.writeFileSync('../thumb/' + themeName + '.png', outputCanvas.toBuffer());
+    });
+});
+function createCanvas() {
+    var canvas = new Canvas(WIDTH, HEIGHT);
+    var ctx = canvas.getContext('2d');
+    ctx.addFont(font);
+    return canvas;
+}