我正在使用flot生成条形图。 这是我的代码bar graph code
怎么做?
答案 0 :(得分:4)
好的,经过大量的Flot和下载源代码后,我终于找到了一个很好的起点。
jsFiddle演示是here。
代码的内容是使用drawSeries
的钩子来绘制标签:
function drawSeriesHook(plot, canvascontext, series) {
var ctx = canvascontext,
plotOffset = plot.offset(),
labelText = 'TEST', // customise this text, maybe to series.label
points = series.datapoints.points,
ps = series.datapoints.pointsize,
xaxis = series.xaxis,
yaxis = series.yaxis,
textWidth, textHeight, textX, textY;
// only draw label for top yellow series
if (series.label === 'baz') {
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.lineWidth = series.bars.lineWidth;
ctx.fillStyle = '#000'; // customise the colour here
for (var i = 0; i < points.length; i += ps) {
if (points[i] == null) continue;
textWidth = ctx.measureText(labelText).width; // measure how wide the label will be
textHeight = parseInt(ctx.font); // extract the font size from the context.font string
textX = xaxis.p2c(points[i] + series.bars.barWidth / 2) - textWidth / 2;
textY = yaxis.p2c(points[i + 1]) - textHeight / 2;
ctx.fillText(labelText, textX, textY); // draw the label
}
ctx.restore();
}
}
请参阅注释,了解可以自定义标签的位置。
要删除y轴刻度,这只是一个简单的选项设置。此外,您可以计算每个条形图堆栈的最大y值,然后将其添加大约100来设置最大Y值,以允许标签占用的空间。然后,所有这些的代码变为:
// determine the max y value from the given data and add a bit to allow for the text
var maxYValue = 0;
var sums = [];
$.each(data,function(i,e) {
$.each(this.data, function(i,e) {
if (!sums[i]) {
sums[i]=0;
}
sums[i] += this[1]; // y-value
});
});
$.each(sums, function() {
maxYValue = Math.max(maxYValue, this);
});
maxYValue += 100; // to allow for the text
var plot = $.plot($("#placeholder"), data, {
series: {
stack: 1,
bars: {
show: true,
barWidth: 0.6,
},
yaxis: {
min: 0,
tickLength: 0
}
},
yaxis: {
max: maxYValue, // set a manual maximum to allow for labels
ticks: 0 // this line removes the y ticks
},
hooks: {
drawSeries: [drawSeriesHook]
}
});
这应该让你开始。你可以从这里拿走它,我敢肯定。