请教一个图上出多条折线的问题
不用3d的，就是最普通的折线图如何出多条数据线
比如
比如数据窗口三个字段，a,b,c,
a是月份,b是进水流量，c是出水流量
a做横轴，b,c分别出一条折线
或者比较常见的
横轴是日期，pb自带的graph如何实现？
------解决方案--------------------
源码：
release 8;
datawindow(units=0 timer_interval=0 color=1090519039 processing=3 HTMLDW=no print.documentname="" print.orientation = 1 print.margin.left = 110 print.margin.right = 110 print.margin.top = 96 print.margin.bottom = 96 print.paper.source = 0 print.paper.size = 0 print.prompt=no print.buttons=no print.preview.buttons=no )
summary(height=0 color="536870912" )
footer(height=0 color="536870912" )
detail(height=0 color="536870912" )
table(column=(type=char(10) updatewhereclause=no name=ctype dbname="Ctype" )
column=(type=decimal(3) updatewhereclause=no name=cmonth dbname="Cmonth" )
column=(type=char(10) updatewhereclause=no name=cvalue dbname="Cvalue" )
)
data("1", 1.000,"11","2", 1.000,"10","1", 2.000,"12","2", 2.000,"13","1", 3.000,"15","2", 3.000,"13","1", 4.000,"16","2", 4.000,"19","1", 5.000,"20","2", 5.000,"22","1", 6.000,"25","2", 6.000,"27","1", 7.000,"28","2", 7.000,"33",)
graph(band=background height="348" width="2286" graphtype="12" perspective="2" rotation="-20" color="0" backcolor="16777215" shadecolor="-6795776" range= 0 border="3" overlappercent="0" spacing="100" elevation="20" depth="100"x="0" y="0" height="348" width="2286" name=gr_1 visible="1" sizetodisplay=1 series="ctype" category="cmonth" values="long(cvalue)" title="温度湿度变化" title.dispattr.backcolor="553648127" title.dispattr.alignment="2" title.dispattr.autosize="1" title.dispattr.font.charset="0" title.dispattr.font.escapement="0" title.dispattr.font.face="Arial" title.dispattr.font.family="2" title.dispattr.font.height="0" title.dispattr.font.italic="0" title.dispattr.font.orientation="0" title.dispattr.font.pitch="2" title.dispattr.font.strikethrough="0" title.dispattr.font.underline="0" title.dispattr.font.weight="700" title.dispattr.format="[general]" title.dispattr.textcolor="0" title.dispattr.displayexpression="title" legend="4" legend.dispattr.backcolor="536870912" legend.dispattr.alignment="0" legend.dispattr.autosize="1" legend.dispattr.font.charset="0" legend.dispattr.font.escapement="0" legend.dispattr.font.face="Arial" legend.dispattr.font.family="2" legend.dispattr.font.height="0" legend.dispattr.font.italic="0" legend.dispattr.font.orientation="0" legend.dispattr.font.pitch="2" legend.dispattr.font.strikethrough="0" legend.dispattr.font.underline="0" legend.dispattr.font.weight="400" legend.dispattr.format="[general]" legend.dispattr.textcolor="0" legend.dispattr.displayexpression="series"
series.autoscale="1"
series.displayeverynlabels="0" series.droplines="1" series.frame="1" series.label="类型" series.majordivisions="0" series.majorgridline="1" series.majortic="3" series.maximumvalue="0" series.minimumvalue="0" series.minordivisions="0" series.minorgridline="1" series.minortic="1" series.originline="1" series.primaryline="0" series.roundto="0" series.roundtounit="0" series.scaletype="1" series.scalevalue="1" series.secondaryline="0" series.shadebackedge="0" series.dispattr.backcolor="536870912" series.dispattr.alignment="0" series.dispattr.autosize="1" series.dispattr.font.charset="0" series.dispattr.font.escapement="7" series.dispattr.font.face="Arial" series.dispattr.font.family="2" series.dispattr.font.height="0" series.dispattr.font.italic="0" series.dispattr.font.orientation="0" series.dispattr.font.pitch="2" series.dispattr.font.strikethrough="0" series.dispattr.font.underline="0" series.dispattr.font.weight="400" series.dispattr.format="8" series.dispattr.textcolor="0" series.dispattr.displayexpression=" title " series.labeldispattr.backcolor="553648127" series.labeldispattr.alignment="2" series.labeldispattr.autosize="1" series.labeldispattr.font.charset="0" series.labeldispattr.font.escapement="0" series.labeldispattr.font.face="Arial" series.labeldispattr.font.family="2" series.labeldispattr.font.height="0" series.labeldispattr.font.italic="0" series.labeldispattr.font.orientation="0" series.labeldispattr.font.pitch="2" series.labeldispattr.font.strikethrough="0" series.labeldispattr.font.underline="0" series.labeldispattr.font.weight="400" series.labeldispattr.format="[general]" series.labeldispattr.textcolor="0" series.labeldispattr.displayexpression="''" series.sort="1"