markdown amCharts V4:国家变身为饼图
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@import url("https://fonts.googleapis.com/css?family=Archivo+Narrow");
body {
font-family: "Archivo Narrow";
margin:0;
}
#chartdiv {
width: 100%;
height: 98vh;
}
/**
* --------------------------------------------------------
* This demo was created using amCharts V4 preview release.
*
* V4 is the latest installement in amCharts data viz
* library family, to be released in the first half of
* 2018.
*
* For more information and documentation visit:
* https://www.amcharts.com/docs/v4/
* --------------------------------------------------------
*/
amcharts4.ready(function() {
amcharts4.useTheme(amcharts4.themes.animated);
var chart = amcharts4.create("chartdiv", amcharts4.map.MapChart);
chart.geoJSON = amcharts4.maps.worldLow;
chart.projection = new amcharts4.map.projections.Mercator();
// zoomout on background click
chart.chartContainer.background.events.on("hit", () => {
zoomOut();
});
var colorSet = new amcharts4.ColorSet();
var morphedPolygon;
// map polygon series (countries)
var polygonSeries = chart.series.push(new amcharts4.map.MapPolygonSeries());
polygonSeries.getDataFromJSON = true;
// specify which countries to include
polygonSeries.include = [
"IT",
"CH",
"FR",
"DE",
"GB",
"ES",
"PT",
"IE",
"NL",
"LU",
"BE",
"AT",
"DK"
];
// country area look and behavior
var polygonTemplate = polygonSeries.mapPolygons.template;
polygonTemplate.strokeOpacity = 1;
polygonTemplate.stroke = amcharts4.color("#ffffff");
polygonTemplate.fillOpacity = 0.5;
polygonTemplate.tooltipText = "{name}";
polygonTemplate.cursorOverStyle = amcharts4.MouseCursorStyle.pointer
// desaturate filter for countries
var desaturateFilter = new amcharts4.DesaturateFilter();
desaturateFilter.saturation = 0.25;
polygonTemplate.filters.push(desaturateFilter);
// take a color from color set
polygonTemplate.adapter.add("fill", (fill, target) => {
return colorSet.getIndex(target.dataItem.index + 1);
});
// set fillOpacity to 1 when hovered
var hoverState = polygonTemplate.states.create("hover");
hoverState.properties.fillOpacity = 1;
// what to do when country is clicked
polygonTemplate.events.on("hit", event => {
selectPolygon(event.target);
});
// Pie chart
var pieChart = chart.seriesContainer.createChild(amcharts4.pie.PieChart);
// Set width/heigh of a pie chart for easier positioning only
pieChart.width = 100;
pieChart.height = 100;
pieChart.visible = false;
var pieSeries = pieChart.series.push(new amcharts4.pie.PieSeries());
pieSeries.dataFields.value = "value";
pieSeries.dataFields.category = "category";
pieSeries.data = [
{ value: 100, category: "First" },
{ value: 20, category: "Second" },
{ value: 10, category: "Third" }
];
var dropShadowFilter = new amcharts4.DropShadowFilter();
dropShadowFilter.blur = 4;
pieSeries.filters.push(dropShadowFilter);
var sliceTemplate = pieSeries.slices.template;
sliceTemplate.fillOpacity = 1;
sliceTemplate.strokeOpacity = 0;
var activeState = sliceTemplate.states.getKey("active");
activeState.properties.shiftRadius = 0; // no need to pull on click, as country circle under the pie won't make it good
var sliceHoverState = sliceTemplate.states.getKey("hover");
sliceHoverState.properties.shiftRadius = 0; // no need to pull on click, as country circle under the pie won't make it good
// we don't need default pie chart animation, so change defaults
var hiddenState = pieSeries.hiddenState;
hiddenState.properties.startAngle = pieSeries.startAngle;
hiddenState.properties.endAngle = pieSeries.endAngle;
hiddenState.properties.opacity = 0;
hiddenState.properties.visible = false;
// series labels
var labelTemplate = pieSeries.labels.template;
labelTemplate.fill = amcharts4.color("#FFFFFF");
labelTemplate.background = new amcharts4.RoundedRectangle();
labelTemplate.background.fillOpacity = 0.9;
labelTemplate.padding(4, 9, 4, 9);
labelTemplate.background.fill = amcharts4.color("#7678a0");
// we need pie series to hide faster to avoid strange pause after country is clicked
pieSeries.hiddenState.transitionDuration = 200;
// country label
var countryLabel = chart.chartContainer.createChild(amcharts4.Label);
countryLabel.text = "Select a country";
countryLabel.fill = amcharts4.color("#7678a0");
countryLabel.fontSize = 40;
countryLabel.hiddenState.properties.dy = 1000;
countryLabel.defaultState.properties.dy = 0;
countryLabel.valign = "middle";
countryLabel.align = "right";
countryLabel.paddingRight = 50;
countryLabel.hide(0);
countryLabel.show();
// select polygon
function selectPolygon(polygon) {
if (morphedPolygon != polygon) {
var animation = pieSeries.hide();
if (animation) {
animation.events.on("animationend", () => {
morphToCircle(polygon);
});
} else {
morphToCircle(polygon);
}
}
}
// fade out all countries except selected
function fadeOut(exceptPolygon) {
for (var i = 0; i < polygonSeries.mapPolygons.length; i++) {
var polygon = polygonSeries.mapPolygons.getIndex(i);
if (polygon != exceptPolygon) {
polygon.defaultState.properties.fillOpacity = 0.5;
polygon.animate(
[
{ property: "fillOpacity", to: 0.5 },
{ property: "strokeOpacity", to: 1 }
],
polygon.polygon.morpher.morphDuration
);
}
}
}
function zoomOut() {
if (morphedPolygon) {
pieSeries.hide();
morphBack();
fadeOut();
countryLabel.hide();
morphedPolygon = undefined;
}
}
function morphBack() {
if (morphedPolygon) {
morphedPolygon.polygon.morpher.morphBack();
var dsf = morphedPolygon.filters.getIndex(0);
dsf.animate(
{ property: "saturation", to: 0.25 },
morphedPolygon.polygon.morpher.morphDuration
);
}
}
function morphToCircle(polygon) {
var animationDuration = polygon.polygon.morpher.morphDuration;
// if there is a country already morphed to circle, morph it back
morphBack();
// morph polygon to circle
polygon.toFront();
polygon.polygon.morpher.morphToSingle = true;
var morphAnimation = polygon.polygon.morpher.morphToCircle();
polygon.strokeOpacity = 0; // hide stroke for lines not to cross countries
polygon.defaultState.properties.fillOpacity = 1;
polygon.animate({ property: "fillOpacity", to: 1 }, animationDuration);
// animate desaturate filter
var filter = polygon.filters.getIndex(0);
filter.animate({ property: "saturation", to: 1 }, animationDuration);
// save currently morphed polygon
morphedPolygon = polygon;
// fade out all other
fadeOut(polygon);
// hide country label
countryLabel.hide();
if (morphAnimation) {
morphAnimation.events.on("animationend", () => {
zoomToCountry(polygon);
});
} else {
zoomToCountry(polygon);
}
}
function zoomToCountry(polygon) {
var zoomAnimation = chart.zoomToMapObject(polygon, 0.5, true);
if (zoomAnimation) {
zoomAnimation.events.on("animationend", () => {
showPieChart(polygon);
});
} else {
showPieChart(polygon);
}
}
function showPieChart(polygon) {
polygon.polygon.measure();
pieChart.radius =
polygon.pixelWidth /
2 *
polygon.globalScale /
chart.seriesContainer.scale;
var centerPoint = amcharts4.utils.spritePointToSvg(
polygon.polygon.centerPoint,
polygon.polygon
);
centerPoint = amcharts4.utils.svgPointToSprite(
centerPoint,
chart.seriesContainer
);
pieChart.x = centerPoint.x - 50;
pieChart.y = centerPoint.y - 50;
var fill = polygon.fill;
var desaturated = fill.saturate(0.3);
for (var i = 0; i < pieSeries.dataItems.length; i++) {
var dataItem = pieSeries.dataItems.getIndex(i);
dataItem.value = Math.round(Math.random() * 100);
dataItem.slice.fill = amcharts4.colors.interpolate(
fill,
amcharts4.color("#ffffff"),
0.2 * i
);
dataItem.label.background.fill = desaturated;
dataItem.tick.stroke = fill;
}
pieSeries.show();
pieChart.show();
countryLabel.text = "{name}";
countryLabel.dataItem = polygon.dataItem;
countryLabel.fill = desaturated;
countryLabel.show();
}
});
<script src="https://www.amcharts.com/lib/4/amcharts.js"></script>
<script src="https://www.amcharts.com/lib/4/pie.js"></script>
<script src="https://www.amcharts.com/lib/4/map.js"></script>
<script src="https://www.amcharts.com/lib/4/maps/worldLow.js"></script>
<script src="https://www.amcharts.com/lib/4/themes/animated.js"></script>
<div id="chartdiv"></div>
amCharts V4: Countries morphing to pie chart
---------------------------------------------
A [Pen](https://codepen.io/harunpehlivan/pen/pLYWRX) by [HARUN PEHLİVAN](https://codepen.io/harunpehlivan) on [CodePen](https://codepen.io).
[License](https://codepen.io/harunpehlivan/pen/pLYWRX/license).
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