Chart.js
Chart.js kom met die volgende ingeboude grafiektipes:
- Strooi
- Lyn
- Kroeg
- Radar
- Pastei en Donut
- Poolgebied
- Borrel
Hoe om Chart.js te gebruik?
Chart.js is maklik om te gebruik.
Voeg eers 'n skakel by die verskaffing van CDN (Content Delivery Network):
<script
src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js">
</script>
Voeg dan 'n <canvas> by waar jy die grafiek wil teken:
<canvas id="myChart" style="width:100%;max-width:700px"></canvas>
Die doekelement moet 'n unieke ID hê.
Dis al!
Tipiese verstrooiingsgrafieksintaksis:
var myChart = new Chart("myChart", {
type: "scatter",
data: {},
options: {}
});
Tipiese lyngrafieksintaksis:
var myChart = new Chart("myChart", {
type: "line",
data: {},
options: {}
});
Tipiese staafgrafieksintaksis:
var myChart = new Chart("myChart", {
type: "bar",
data: {},
options: {}
});
Strooi erwe
Huispryse vs. Grootte
Bronkode
var xyValues = [
{x:50, y:7},
{x:60, y:8},
{x:70, y:8},
{x:80, y:9},
{x:90, y:9},
{x:100, y:9},
{x:110, y:10},
{x:120, y:11},
{x:130, y:14},
{x:140, y:14},
{x:150, y:15}
];
new Chart("myChart", {
type: "scatter",
data: {
datasets: [{
pointRadius: 4,
pointBackgroundColor: "rgba(0,0,255,1)",
data: xyValues
}]
},
options:{...}
});
Lyngrafieke
Huispryse vs. Grootte
Bronkode
var xValues = [50,60,70,80,90,100,110,120,130,140,150];
var yValues = [7,8,8,9,9,9,10,11,14,14,15];
new Chart("myChart", {
type: "line",
data: {
labels: xValues,
datasets: [{
backgroundColor: "rgba(0,0,0,1.0)",
borderColor: "rgba(0,0,0,0.1)",
data: yValues
}]
},
options:{...}
});
As jy die grensKleur op nul stel, kan jy die lyngrafiek strooidiagram :
borderColor: "rgba(0,0,0,0)",
Veelvuldige lyne
Bronkode
var xValues = [100,200,300,400,500,600,700,800,900,1000];
new Chart("myChart", {
type: "line",
data: {
labels: xValues,
datasets: [{
data: [860,1140,1060,1060,1070,1110,1330,2210,7830,2478],
borderColor: "red",
fill: false
},{
data: [1600,1700,1700,1900,2000,2700,4000,5000,6000,7000],
borderColor: "green",
fill: false
},{
data: [300,700,2000,5000,6000,4000,2000,1000,200,100],
borderColor: "blue",
fill: false
}]
},
options: {
legend: {display: false}
}
});
Lineêre grafieke
Bronkode
var xValues = [];
var yValues = [];
generateData("x * 2 + 7", 0, 10, 0.5);
new Chart("myChart", {
type: "line",
data: {
labels: xValues,
datasets: [{
fill: false,
pointRadius: 1,
borderColor: "rgba(255,0,0,0.5)",
data: yValues
}]
},
options: {...}
});
function generateData(value, i1, i2, step = 1) {
for (let x = i1; x
yValues.push(eval(value));
xValues.push(x);
}
}
Funksie grafieke
Dieselfde as Lineêre Grafiek. Verander net die genereerData-parameter(s):
generateData("Math.sin(x)", 0, 10, 0.5);
Staafgrafieke
Bronkode
var xValues = ["Italy", "France", "Spain", "USA", "Argentina"];
var yValues = [55, 49, 44, 24, 15];
var barColors = ["red", "green","blue","orange","brown"];
new Chart("myChart", {
type: "bar",
data: {
labels: xValues,
datasets: [{
backgroundColor: barColors,
data: yValues
}]
},
options: {...}
});
Kleur slegs een balk:
var barColors = ["blue"];
Dieselfde kleur alle stawe:
var barColors ="red";
Kleurskakerings:
var barColors = [
"rgba(0,0,255,1.0)",
"rgba(0,0,255,0.8)",
"rgba(0,0,255,0.6)",
"rgba(0,0,255,0.4)",
"rgba(0,0,255,0.2)",
];
Horisontale stawe
Verander net tipe van "bar" na "horizontalBar":
type: "horizontalBar",
Sirkeldiagramme
Voorbeeld
new Chart("myChart", {
type: "pie",
data: {
labels: xValues,
datasets: [{
backgroundColor: barColors,
data: yValues
}]
},
options: {
title: {
display: true,
text: "World Wide Wine Production"
}
}
});
Doughnut Charts
Just change type from "pie" to "doughnut":
type: "doughnut";