1067 lines
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HTML
1067 lines
30 KiB
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Chart.js
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Getting Started
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Installation
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Integration
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Usage
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General
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Responsive
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Pixel Ratio
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<a href="../general/interactions/">
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Interactions
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.3.1" data-path="../general/interactions/events.html">
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<a href="../general/interactions/events.html">
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Events
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</a>
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<a href="../general/interactions/modes.html">
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Modes
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</a>
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<a href="../general/options.html">
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Options
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<li class="chapter " data-level="1.3.5" data-path="../general/colors.html">
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<a href="../general/colors.html">
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Colors
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</a>
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<li class="chapter " data-level="1.3.6" data-path="../general/fonts.html">
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<a href="../general/fonts.html">
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Fonts
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</a>
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</li>
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</ul>
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<li class="chapter " data-level="1.4" data-path="../configuration/">
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<a href="../configuration/">
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Configuration
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.1" data-path="../configuration/animations.html">
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<a href="../configuration/animations.html">
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Animations
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</a>
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</li>
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<li class="chapter " data-level="1.4.2" data-path="../configuration/layout.html">
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<a href="../configuration/layout.html">
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Layout
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</a>
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</li>
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<li class="chapter " data-level="1.4.3" data-path="../configuration/legend.html">
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<a href="../configuration/legend.html">
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Legend
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</a>
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</li>
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<li class="chapter " data-level="1.4.4" data-path="../configuration/title.html">
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<a href="../configuration/title.html">
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Title
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</a>
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</li>
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<li class="chapter " data-level="1.4.5" data-path="../configuration/tooltip.html">
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<a href="../configuration/tooltip.html">
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Tooltip
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</a>
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</li>
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<li class="chapter " data-level="1.4.6" data-path="../configuration/elements.html">
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<a href="../configuration/elements.html">
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Elements
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.5" data-path="../charts/">
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<a href="../charts/">
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Charts
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1" data-path="../charts/line.html">
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<a href="../charts/line.html">
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Line
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</a>
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</li>
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<li class="chapter " data-level="1.5.2" data-path="../charts/bar.html">
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<a href="../charts/bar.html">
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Bar
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</a>
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</li>
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<li class="chapter " data-level="1.5.3" data-path="../charts/radar.html">
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<a href="../charts/radar.html">
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Radar
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</a>
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</li>
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<li class="chapter " data-level="1.5.4" data-path="../charts/doughnut.html">
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<a href="../charts/doughnut.html">
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Doughnut & Pie
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</a>
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</li>
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<li class="chapter " data-level="1.5.5" data-path="../charts/polar.html">
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<a href="../charts/polar.html">
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Polar Area
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</a>
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</li>
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<li class="chapter " data-level="1.5.6" data-path="../charts/bubble.html">
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<a href="../charts/bubble.html">
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Bubble
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</a>
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</li>
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<li class="chapter " data-level="1.5.7" data-path="../charts/scatter.html">
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<a href="../charts/scatter.html">
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Scatter
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</a>
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</li>
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<li class="chapter " data-level="1.5.8" data-path="../charts/area.html">
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<a href="../charts/area.html">
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Area
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</a>
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</li>
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<li class="chapter " data-level="1.5.9" data-path="../charts/mixed.html">
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<a href="../charts/mixed.html">
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Mixed
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.6" data-path="../axes/">
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<a href="../axes/">
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Axes
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.1" data-path="../axes/cartesian/">
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<a href="../axes/cartesian/">
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Cartesian
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.1.1" data-path="../axes/cartesian/category.html">
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<a href="../axes/cartesian/category.html">
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Category
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</a>
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</li>
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<li class="chapter " data-level="1.6.1.2" data-path="../axes/cartesian/linear.html">
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<a href="../axes/cartesian/linear.html">
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Linear
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</a>
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</li>
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<li class="chapter " data-level="1.6.1.3" data-path="../axes/cartesian/logarithmic.html">
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<a href="../axes/cartesian/logarithmic.html">
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Logarithmic
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</a>
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</li>
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<li class="chapter " data-level="1.6.1.4" data-path="../axes/cartesian/time.html">
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<a href="../axes/cartesian/time.html">
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Time
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.6.2" data-path="../axes/radial/">
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<a href="../axes/radial/">
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Radial
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.2.1" data-path="../axes/radial/linear.html">
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<a href="../axes/radial/linear.html">
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Linear
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.6.3" data-path="../axes/labelling.html">
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<a href="../axes/labelling.html">
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Labelling
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</a>
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</li>
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<li class="chapter " data-level="1.6.4" data-path="../axes/styling.html">
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<a href="../axes/styling.html">
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Styling
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.7" data-path="./">
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<a href="./">
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Developers
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.7.1" data-path="api.html">
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<a href="api.html">
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Chart.js API
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</a>
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</li>
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<li class="chapter " data-level="1.7.2" data-path="updates.html">
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<a href="updates.html">
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Updating Charts
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</a>
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</li>
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<li class="chapter " data-level="1.7.3" data-path="plugins.html">
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<a href="plugins.html">
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Plugins
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</a>
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</li>
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<li class="chapter active" data-level="1.7.4" data-path="charts.html">
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<a href="charts.html">
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New Charts
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</a>
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</li>
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<li class="chapter " data-level="1.7.5" data-path="axes.html">
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<a href="axes.html">
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New Axes
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</a>
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</li>
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<li class="chapter " data-level="1.7.6" data-path="contributing.html">
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<a href="contributing.html">
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Contributing
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.8" data-path="../notes/">
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<a href="../notes/">
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Additional Notes
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.8.1" data-path="../notes/comparison.html">
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<a href="../notes/comparison.html">
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >New Charts</a>
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</h1>
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<div class="search-noresults">
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<section class="normal markdown-section">
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<h1 id="new-charts">New Charts</h1>
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<p>Chart.js 2.0 introduces the concept of controllers for each dataset. Like scales, new controllers can be written as needed.</p>
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<pre><code class="lang-javascript">Chart.controllers.MyType = Chart.DatasetController.extend({
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});
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<span class="hljs-comment">// Now we can create a new instance of our chart, using the Chart.js API</span>
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<span class="hljs-keyword">new</span> Chart(ctx, {
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<span class="hljs-comment">// this is the string the constructor was registered at, ie Chart.controllers.MyType</span>
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type: <span class="hljs-string">'MyType'</span>,
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data: data,
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options: options
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});
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</code></pre>
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<h2 id="dataset-controller-interface">Dataset Controller Interface</h2>
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<p>Dataset controllers must implement the following interface.</p>
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<pre><code class="lang-javascript">{
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<span class="hljs-comment">// Create elements for each piece of data in the dataset. Store elements in an array on the dataset as dataset.metaData</span>
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addElements: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
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<span class="hljs-comment">// Create a single element for the data at the given index and reset its state</span>
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addElementAndReset: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">index</span>) </span>{},
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<span class="hljs-comment">// Draw the representation of the dataset</span>
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<span class="hljs-comment">// @param ease : if specified, this number represents how far to transition elements. See the implementation of draw() in any of the provided controllers to see how this should be used</span>
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draw: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">ease</span>) </span>{},
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<span class="hljs-comment">// Remove hover styling from the given element</span>
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removeHoverStyle: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">element</span>) </span>{},
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<span class="hljs-comment">// Add hover styling to the given element</span>
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setHoverStyle: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">element</span>) </span>{},
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<span class="hljs-comment">// Update the elements in response to new data</span>
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<span class="hljs-comment">// @param reset : if true, put the elements into a reset state so they can animate to their final values</span>
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update: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">reset</span>) </span>{},
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}
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</code></pre>
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<p>The following methods may optionally be overridden by derived dataset controllers</p>
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<pre><code class="lang-javascript">{
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<span class="hljs-comment">// Initializes the controller</span>
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initialize: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">chart, datasetIndex</span>) </span>{},
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<span class="hljs-comment">// Ensures that the dataset represented by this controller is linked to a scale. Overridden to helpers.noop in the polar area and doughnut controllers as these</span>
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<span class="hljs-comment">// chart types using a single scale</span>
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linkScales: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
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<span class="hljs-comment">// Called by the main chart controller when an update is triggered. The default implementation handles the number of data points changing and creating elements appropriately.</span>
|
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buildOrUpdateElements: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{}
|
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}
|
|
</code></pre>
|
|
<h2 id="extending-existing-chart-types">Extending Existing Chart Types</h2>
|
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<p>Extending or replacing an existing controller type is easy. Simply replace the constructor for one of the built in types with your own.</p>
|
|
<p>The built in controller types are:</p>
|
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<ul>
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<li><code>Chart.controllers.line</code></li>
|
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<li><code>Chart.controllers.bar</code></li>
|
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<li><code>Chart.controllers.radar</code></li>
|
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<li><code>Chart.controllers.doughnut</code></li>
|
|
<li><code>Chart.controllers.polarArea</code></li>
|
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<li><code>Chart.controllers.bubble</code></li>
|
|
</ul>
|
|
<p>For example, to derive a new chart type that extends from a bubble chart, you would do the following.</p>
|
|
<pre><code class="lang-javascript"><span class="hljs-comment">// Sets the default config for 'derivedBubble' to be the same as the bubble defaults.</span>
|
|
<span class="hljs-comment">// We look for the defaults by doing Chart.defaults[chartType]</span>
|
|
<span class="hljs-comment">// It looks like a bug exists when the defaults don't exist</span>
|
|
Chart.defaults.derivedBubble = Chart.defaults.bubble;
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|
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<span class="hljs-comment">// I think the recommend using Chart.controllers.bubble.extend({ extensions here });</span>
|
|
<span class="hljs-keyword">var</span> custom = Chart.controllers.bubble.extend({
|
|
draw: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">ease</span>) </span>{
|
|
<span class="hljs-comment">// Call super method first</span>
|
|
Chart.controllers.bubble.prototype.draw.call(<span class="hljs-keyword">this</span>, ease);
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|
|
<span class="hljs-comment">// Now we can do some custom drawing for this dataset. Here we'll draw a red box around the first point in each dataset</span>
|
|
<span class="hljs-keyword">var</span> meta = <span class="hljs-keyword">this</span>.getMeta();
|
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<span class="hljs-keyword">var</span> pt0 = meta.data[<span class="hljs-number">0</span>];
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<span class="hljs-keyword">var</span> radius = pt0._view.radius;
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|
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<span class="hljs-keyword">var</span> ctx = <span class="hljs-keyword">this</span>.chart.chart.ctx;
|
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ctx.save();
|
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ctx.strokeStyle = <span class="hljs-string">'red'</span>;
|
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ctx.lineWidth = <span class="hljs-number">1</span>;
|
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ctx.strokeRect(pt0._view.x - radius, pt0._view.y - radius, <span class="hljs-number">2</span> * radius, <span class="hljs-number">2</span> * radius);
|
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ctx.restore();
|
|
}
|
|
});
|
|
|
|
<span class="hljs-comment">// Stores the controller so that the chart initialization routine can look it up with</span>
|
|
<span class="hljs-comment">// Chart.controllers[type]</span>
|
|
Chart.controllers.derivedBubble = custom;
|
|
|
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<span class="hljs-comment">// Now we can create and use our new chart type</span>
|
|
<span class="hljs-keyword">new</span> Chart(ctx, {
|
|
type: <span class="hljs-string">'derivedBubble'</span>,
|
|
data: data,
|
|
options: options,
|
|
});
|
|
</code></pre>
|
|
<h3 id="bar-controller">Bar Controller</h3>
|
|
<p>The bar controller has a special property that you should be aware of. To correctly calculate the width of a bar, the controller must determine the number of datasets that map to bars. To do this, the bar controller attaches a property <code>bar</code> to the dataset during initialization. If you are creating a replacement or updated bar controller, you should do the same. This will ensure that charts with regular bars and your new derived bars will work seamlessly.</p>
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