Merge pull request #19 from tdhopper/set-altair-renderer

Set altair renderer

Author: tdhopper

Examples.ipynb

@@ -48,45 +48,9 @@
     "\n",
     "templated_fig = pio.to_templated(fig)\n",
     "pio.templates['my_template'] = templated_fig.layout.template\n",
-    "pio.templates.default = 'my_template'"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "from io import BytesIO\n",
-    "\n",
-    "def render_altair(chart):\n",
-    "    b = BytesIO()\n",
-    "    chart.save(b, scale_factor=2.0, format='png', webdriver='firefox')\n",
-    "    b.seek(0)\n",
-    "    return b.read()\n",
-    "\n",
-    "\n",
-    "import ast\n",
+    "pio.templates.default = 'my_template'\n",
     "\n",
-    "def exec_then_eval(code, shell):\n",
-    "    block = ast.parse(code, mode='exec')\n",
-    "\n",
-    "    # assumes last node is an expression\n",
-    "    last = ast.Expression(block.body.pop().value)\n",
-    "\n",
-    "    _globals, _locals = {}, {}\n",
-    "    shell.ex(compile(block, '<string>', mode='exec'))\n",
-    "    return shell.ev(compile(last, '<string>', mode='eval'))\n",
-    "\n",
-    "@magics_class\n",
-    "class AltairMagic(Magics):\n",
-    "    @cell_magic\n",
-    "    def altair(self, line, cell):\n",
-    "        return Image(render_altair(exec_then_eval(cell, self.shell)))\n",
-    "\n",
-    "\n",
-    "ip = get_ipython()\n",
-    "ip.register_magics(AltairMagic)"
+    "alt.renderers.enable('png', webdriver='firefox')"
    ]
   },
   {
@@ -109,13 +73,6 @@
     "theme_set(theme_grey(base_size = 24))"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -354,7 +311,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair\n",
     "(\n",
     "    alt.Chart(\n",
     "        mpg, title=\"Number of Cars by Make\"\n",
@@ -475,7 +431,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair\n",
     "(\n",
     "    alt.Chart(mpg)\n",
     "    .mark_bar()\n",
@@ -566,7 +521,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair \n",
     "alt.Chart(mpg).mark_circle().encode(\n",
     "    alt.X(\n",
     "        \"displ\",\n",
@@ -813,7 +767,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair \n",
     "(\n",
     "    alt.Chart(\n",
     "        mpg,\n",
@@ -948,7 +901,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair\n",
     "(\n",
     "    alt.Chart(\n",
     "        mpg,\n",
@@ -1068,7 +1020,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair \n",
     "alt.Chart(mpg).mark_circle().encode(\n",
     "    x=alt.X(\"displ\"),\n",
     "    y=alt.Y(\"hwy\"),\n",
@@ -1190,7 +1141,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair \n",
     "(alt\n",
     " .Chart(mpg)\n",
     " .mark_circle()\n",
@@ -1306,7 +1256,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair\n",
     "scatter = (\n",
     "    alt.Chart(\n",
     "        mpg,\n",
@@ -1463,7 +1412,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair\n",
     "alt.data_transformers.disable_max_rows()\n",
     "alt.Chart(diamonds).mark_bar().encode(\n",
     "    x=\"cut\", y=\"count(cut)\", color=\"clarity\"\n",
@@ -1552,7 +1500,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair\n",
     "alt.data_transformers.disable_max_rows()\n",
     "alt.Chart(diamonds).mark_bar().encode(\n",
     "    x=\"clarity\",\n",
@@ -1727,7 +1674,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair\n",
     "alt.data_transformers.disable_max_rows()\n",
     "alt.Chart(diamonds).transform_density(\n",
     "    \"depth\",\n",
@@ -1849,7 +1795,6 @@
    },
    "outputs": [],
    "source": [
-    "%%altair \n",
     "alt.Chart(ts).mark_line().encode(\n",
     "    x=\"date\", y=\"value\"\n",
     ")"