chart.js 怎么连接数据库

C# code var myChart = new Chart(ctx)Pie(data, options) var legend = myChartgenerateLegend(); legend 里就是模板生成的HTML代码，可以设置为某个元素的innerHTML然后就显示出来了

//设置ajax访问后台填充饼图

function setChartPie(url,id){

var Chart=require('echarts')init(documentgetElementById(id));

ChartshowLoading({text: '正在努力的读取数据中' });

var label=[];

var value=[];

$ajax({

url:url,

dataType:"json",

success:function(data){

$each(data,function(i,p){

label[i]=p['label'];

value[i]={'name':p['label'],'value':p['value']};

});

CharthideLoading();

optionPielegenddata=label;

optionPieseries[0]['data']=value;

optionPieseries[0]['radius']=[0,100];

ChartsetOption(optionPie);

}

});

}

用控件不是很简单吗？？？？？？

//画饼形图

public static void draw_pie()

{

Bitmap myImage = new Bitmap(600, 300);

Graphics g = GraphicsFromImage(myImage);

gClear(ColorWhite);

//绘画图形中指定的位置，以指定的字体，表示为图标

gDrawString("销售情况表", new Font("宋体", 16), BrushesBlack, new Point(5, 5));

Point rec = new Point(513, 30);

Point dec = new Point(540, 30);

Point txt = new Point(565, 30);

gDrawString("单位：件", new Font("宋体", 9), BrushesBlack, new Point(512, 12));

for (int i = 0; i < monthsLength; i++)

{

gFillRectangle(new SolidBrush(get_color(i)), recX, recY, 20, 10);

gDrawRectangle(PensBlack, recX, recY, 20, 10);

gDrawString(months[i]ToString(), new Font("宋体", 9), BrushesBlack, dec);

//绘制右边的文字

gDrawString(number[i]ToString(), new Font("宋体", 9), BrushesBlack, txt);

recY += 15;

decY += 15;

txtY += 15;

}

int total = 0;

float currentAanle = 0;

float startAngle = 0;

for (int i = 0; i < numberLength; i++)

{

total += number[i];

}

for (int i = 0; i < numberLength; i++)

{

if (i == numberLength)

{

currentAanle = 360 - startAngle;

}

else

{

int temp = number[i];

currentAanle = (temp 360) / total;

}

gDrawPie(PensBlack, 100, 40, 250, 250, startAngle, currentAanle);

gFillPie(new SolidBrush(get_color(i)), 100, 40, 250, 250, startAngle, currentAanle);

startAngle += currentAanle;

}

Pen pen = new Pen(ColorBlack, 2);

gDrawRectangle(pen, 1, 1, 598, 298);

myImageSave(SystemWeb>

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