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Viewing: 152.481a7bd4.js

(window.webpackJsonp=window.webpackJsonp||[]).push([[152],{482:function(n,t,a){"use strict";a.r(t);var e=a(6),o=Object(e.a)({},(function(){var n=this,t=n.$createElement,a=n._self._c||t;return a("ContentSlotsDistributor",{attrs:{"slot-key":n.$parent.slotKey}},[a("h1",{attrs:{id:"canvas-background"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#canvas-background"}},[n._v("#")]),n._v(" Canvas background")]),n._v(" "),a("p",[n._v("In some use cases you would want a background image or color over the whole canvas. There is no built-in support for this, the way you can achieve this is by writing a custom plugin.")]),n._v(" "),a("p",[n._v("In the two example plugins underneath here you can see how you can draw a color or image to the canvas as background. This way of giving the chart a background is only necessary if you want to export the chart with that specific background.\nFor normal use you can set the background more easily with "),a("a",{attrs:{href:"https://www.w3schools.com/cssref/css3_pr_background.asp",target:"_blank",rel:"noopener noreferrer"}},[n._v("CSS"),a("OutboundLink")],1),n._v(".")]),n._v(" "),a("tabs",[a("tab",{attrs:{name:"Color"}},[a("chart-editor",{attrs:{code:"// <block:setup:1>\nconst data = {\n  labels: [\n    'Red',\n    'Blue',\n    'Yellow'\n  ],\n  datasets: [{\n    label: 'My First Dataset',\n    data: [300, 50, 100],\n    backgroundColor: [\n      'rgb(255, 99, 132)',\n      'rgb(54, 162, 235)',\n      'rgb(255, 205, 86)'\n    ],\n    hoverOffset: 4\n  }]\n};\n// </block:setup>\n\n// <block:plugin:2>\n// Note: changes to the plugin code is not reflected to the chart, because the plugin is loaded at chart construction time and editor changes only trigger an chart.update().\nconst plugin = {\n  id: 'custom_canvas_background_color',\n  beforeDraw: (chart) => {\n    const {ctx} = chart;\n    ctx.save();\n    ctx.globalCompositeOperation = 'destination-over';\n    ctx.fillStyle = 'lightGreen';\n    ctx.fillRect(0, 0, chart.width, chart.height);\n    ctx.restore();\n  }\n};\n// </block:plugin>\n\n// <block:config:0>\nconst config = {\n  type: 'doughnut',\n  data: data,\n  plugins: [plugin],\n};\n// </block:config>\n\nmodule.exports = {\n  actions: [],\n  config: config,\n};\n"}})],1),n._v(" "),a("tab",{attrs:{name:"Image"}},[a("chart-editor",{attrs:{code:"// <block:setup:1>\nconst data = {\n  labels: [\n    'Red',\n    'Blue',\n    'Yellow'\n  ],\n  datasets: [{\n    label: 'My First Dataset',\n    data: [300, 50, 100],\n    backgroundColor: [\n      'rgb(255, 99, 132)',\n      'rgb(54, 162, 235)',\n      'rgb(255, 205, 86)'\n    ],\n    hoverOffset: 4\n  }]\n};\n// </block:setup>\n\n// <block:plugin:2>\n// Note: changes to the plugin code is not reflected to the chart, because the plugin is loaded at chart construction time and editor changes only trigger an chart.update().\nconst image = new Image();\nimage.src = 'https://www.chartjs.org/img/chartjs-logo.svg';\n\nconst plugin = {\n  id: 'custom_canvas_background_image',\n  beforeDraw: (chart) => {\n    if (image.complete) {\n      const ctx = chart.ctx;\n      const {top, left, width, height} = chart.chartArea;\n      const x = left + width / 2 - image.width / 2;\n      const y = top + height / 2 - image.height / 2;\n      ctx.drawImage(image, x, y);\n    } else {\n      image.onload = () => chart.draw();\n    }\n  }\n};\n// </block:plugin>\n\n// <block:config:0>\nconst config = {\n  type: 'doughnut',\n  data: data,\n  plugins: [plugin],\n};\n// </block:config>\n\nmodule.exports = {\n  actions: [],\n  config: config,\n};\n"}})],1)],1)],1)}),[],!1,null,null,null);t.default=o.exports}}]);
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