總覽
在許多 Google 圖表中，資料值會顯示在確切的時間點。折線圖只是一組以線連接的點，散佈圖是沒有任何點的。
在散佈圖以外的所有圖表中，這些點的大小預設為零。您可以使用 pointSize 選項控制其大小，並使用 pointShape 選項控制其形狀。
上面可以看到，包含六個序列的圖表，各有 pointSize 30，但 pointShape 不同。
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 7 },
pointSize: 30,
series: {
0: { pointShape: 'circle' },
1: { pointShape: 'triangle' },
2: { pointShape: 'square' },
3: { pointShape: 'diamond' },
4: { pointShape: 'star' },
5: { pointShape: 'polygon' }
}
};
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load("current", {packages:["corechart"]});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable
([['X', '1', '2', '3', '4', '5', '6'],
[1, 2, null, null, null, null, null],
[2, null, 3, null, null, null, null],
[3, null, null, 4, null, null, null],
[4, null, null, null, 5, null, null],
[5, null, null, null, null, 6, null],
[6, null, null, null, null, null, 7]
]);
var options = {
legend: 'none',
pointSize: 30,
series: {
0: { pointShape: 'circle' },
1: { pointShape: 'triangle' },
2: { pointShape: 'square' },
3: { pointShape: 'diamond' },
4: { pointShape: 'star' },
5: { pointShape: 'polygon' }
}
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
一些簡易範例
與上一節的圖表不同，大部分的圖表只有一個系列。以下折線圖範例包含 20 pt 圓形點：
由於預設的 pointShape 為圓形，因此可以將其排除在選項之外：
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 9 },
curveType: 'function',
pointSize: 20,
};
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load("current", {packages:["corechart"]});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable
([['X', 'Y'],
[1, 3],
[2, 2.5],
[3, 3],
[4, 4],
[5, 4],
[6, 3],
[7, 2.5],
[8, 3]
]);
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 9 },
curveType: 'function',
pointSize: 20,
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
如要將形狀從「圓形」變更為其他形狀，請將 pointShape 設為「三角形」、「正方形」、「菱形」、「星號」或「多邊形」：
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 9 },
colors: ['#795548'],
pointSize: 20,
pointShape: 'square'
};
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load("current", {packages:["corechart"]});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable
([['X', 'Y'],
[1, 3],
[2, 2.5],
[3, 3],
[4, 4],
[5, 4],
[6, 3],
[7, 2.5],
[8, 3]
]);
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 9 },
colors: ['#795548'],
pointSize: 20,
pointShape: 'square'
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
您可以運用「星號」和「多邊形」形狀自訂邊數 (預設值為五)。部分四面星星：
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 9 },
colors: ['#EF851C'],
pointSize: 30,
pointShape: { type: 'star', sides: 4 }
};
<html>
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load("current", {packages:["corechart"]});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable
([['X', 'Y'],
[1, 3],
[2, 2.5],
[3, 3],
[4, 4],
[5, 4],
[6, 3],
[7, 2.5],
[8, 3]
]);
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 9 },
colors: ['#EF851C'],
pointSize: 30,
pointShape: { type: 'star', sides: 4 }
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
您可以使用 dent 選項進一步自訂星號，而該選項可控制星號的串連方式。凹陷接近零時，星星會類似星魚；當凹陷接近一時，星體會穿過等邊多邊形。
以下是 0.05 到 0.8 的凹槽星號：
var options = {
legend: 'none',
hAxis: { textPosition: 'none' },
vAxis: { textPosition: 'none', gridlines: { count: 0 },
baselineColor: 'white' },
colors: ['#E94D20', '#ECA403', '#63A74A',
'#15A0C8', '#4151A3', '#703593', '#981B48'],
pointSize: 20,
annotations: { stemColor: 'white', textStyle: { fontSize: 16 } },
series: {
0: { pointShape: { type: 'star', sides: 5, dent: 0.05 } },
1: { pointShape: { type: 'star', sides: 5, dent: 0.1 } },
2: { pointShape: { type: 'star', sides: 5, dent: 0.2 } },
3: { pointShape: { type: 'star', sides: 5 } },
4: { pointShape: { type: 'star', sides: 5, dent: 0.5 } },
5: { pointShape: { type: 'star', sides: 5, dent: 0.7 } },
6: { pointShape: { type: 'star', sides: 5, dent: 0.8 } },
}
};
<html>
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load("current", {packages:["corechart"]});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'Element');
data.addColumn('number', 'A');
data.addColumn( { type: 'string', role: 'annotation' });
data.addColumn('number', 'B');
data.addColumn( { type: 'string', role: 'annotation' });
data.addColumn('number', 'C');
data.addColumn( { type: 'string', role: 'annotation' });
data.addColumn('number', 'D');
data.addColumn( { type: 'string', role: 'annotation' });
data.addColumn('number', 'E');
data.addColumn( { type: 'string', role: 'annotation' });
data.addColumn('number', 'F');
data.addColumn( { type: 'string', role: 'annotation' });
data.addColumn('number', 'G');
data.addColumn( { type: 'string', role: 'annotation' });
data.addRow(['A', 1, "dent: 0.05", , , , , , , , , , , , null]);
data.addRow(['B', , , 1, "dent: 0.1", , , , , , , , , , null]);
data.addRow(['C', , , , , 1, "dent: 0.2", , , , , , , , null]);
data.addRow(['D', , , , , , , 1, "default", , , , , , null]);
data.addRow(['E', , , , , , , , , 1, "dent: 0.5", , , , null]);
data.addRow(['F', , , , , , , , , , , 1, "dent: 0.7", , null]);
data.addRow(['G', , , , , , , , , , , , , 1, "dent: 0.8"]);
var options = {
legend: 'none',
hAxis: { textPosition: 'none' },
vAxis: { textPosition: 'none', gridlines: { count: 0 },
baselineColor: 'white' },
colors: ['#E94D20', '#ECA403', '#63A74A',
'#15A0C8', '#4151A3', '#703593', '#981B48'],
pointSize: 20,
annotations: { stemColor: 'white', textStyle: { fontSize: 16 } },
series: {
0: { pointShape: { type: 'star', sides: 5, dent: 0.05 } },
1: { pointShape: { type: 'star', sides: 5, dent: 0.1 } },
2: { pointShape: { type: 'star', sides: 5, dent: 0.2 } },
3: { pointShape: { type: 'star', sides: 5 } },
4: { pointShape: { type: 'star', sides: 5, dent: 0.5 } },
5: { pointShape: { type: 'star', sides: 5, dent: 0.7 } },
6: { pointShape: { type: 'star', sides: 5, dent: 0.8 } },
}
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
輪播
所有點形狀都可以使用 rotation 選項旋轉 (以度為單位)。舉例來說，我們可以將下列面積圖中的三角形旋轉 180 度，讓三角形朝下：
var options = {
legend: 'none',
colors: ['#15A0C8'],
pointSize: 30,
pointShape: { type: 'triangle', rotation: 180 }
};
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load("current", {packages:["corechart"]});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable
([['X', 'Y'],
[1, 3],
[2, 2.5],
[3, 2],
[4, 3],
[5, 4.5],
[6, 6.5],
[7, 9],
[8, 12]
]);
var options = {
legend: 'none',
colors: ['#15A0C8'],
pointSize: 30,
pointShape: { type: 'triangle', rotation: 180 }
};
var chart = new google.visualization.AreaChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
自訂個別積分
根據預設，套用到某個點的樣式會套用至系列中的所有點。如要變更特定資料點的外觀，只要設定其樣式即可。
在下圖中，我們將其中一個點的大小增加、將透明度降低為 0.3，以及變更形狀和顏色：
<html>
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load('current', {'packages':['corechart']});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable
([['X', 'Y', {'type': 'string', 'role': 'style'}],
[1, 3, null],
[2, 2.5, null],
[3, 3, null],
[4, 4, null],
[5, 4, null],
[6, 3, 'point { size: 18; shape-type: star; fill-color: #a52714; }'],
[7, 2.5, null],
[8, 3, null]
]);
var options = {
legend: 'none',
hAxis: { minValue: 0, maxValue: 9 },
curveType: 'function',
pointSize: 7,
dataOpacity: 0.3
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
可用的自訂樣式如下：
fill-color(以十六進位字串表示)。shape-dentshape-rotationshape-sidesshape-typestroke-color(以十六進位字串表示)。stroke-width(以十六進位字串表示)。sizevisible(指出該點是否可見)。
不透明度是由樣式控制，而是使用 dataOpacity 選項。