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这篇CFSDN的博客文章C#绘制曲线图的方法由作者收集整理,如果你对这篇文章有兴趣,记得点赞哟.
本文实例讲述了c#绘制曲线图的方法。分享给大家供大家参考。具体如下:
1. 曲线图效果:
2. c#代码:
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/// <summary>
/// 自动根据参数调整图像大小
/// </summary>
public
void
fit()
{
//计算字体距离
intfontspace = fontsize + 5;
//计算图像边距
float
fltspace = math.min(width / 6, height / 6);
xspace = fltspace;
yspace = fltspace;
//计算x轴刻度宽度
xslice = (width - 2 * xspace) / (keys.length - 1);
//计算y轴刻度宽度和y轴刻度开始值
float
fltminvalue = 0;
float
fltmaxvalue = 0;
for
(
int
i = 0; i < values.length; i++)
{
if
(values[i] < fltminvalue)
{
fltminvalue = values[i];
}
else
if
(values[i] > fltmaxvalue)
{
fltmaxvalue = values[i];
}
}
if
(yslicebegin > fltminvalue)
{
yslicebegin = fltminvalue;
}
int
intyslicecount = (
int
)(fltmaxvalue / yslicevalue);
if
(fltmaxvalue % yslicevalue != 0)
{
intyslicecount++;
}
yslice = (height - 2 * yspace) / intyslicecount;
}
|
3. 数据缩小一个级别的效果:
4. 完整代码 drawingcurve.cs:
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|
using
system;
using
system.collections.generic;
using
system.text;
using
system.drawing;
using
system.data;
using
system.drawing.drawing2d;
namespace
sarchpms.business.draw
{
public
class
drawingcurve : drawingchart
{
/// <summary>
/// 画曲线图
/// </summary>
/// <param name="dsparameter"></param>
/// <returns></returns>
public
override
bitmap drawimage(dataset dsparameter)
{
curve2d cuv2d =
new
curve2d();
cuv2d.fit();
return
cuv2d.createimage();
}
}
public
class
curve2d
{
private
graphics objgraphics;
//graphics 类提供将对象绘制到显示设备的方法
private
bitmap objbitmap;
//位图对象
private
float
fltwidth = 480;
//图像宽度
private
float
fltheight = 248;
//图像高度
private
float
fltxslice = 50;
//x轴刻度宽度
private
float
fltyslice = 50;
//y轴刻度宽度
private
float
fltyslicevalue = 20;
//y轴刻度的数值宽度
private
float
fltyslicebegin = 0;
//y轴刻度开始值
private
float
flttension = 0.5f;
private
string
strtitle =
"曲线图"
;
//标题
private
string
strxaxistext =
"月份"
;
//x轴说明文字
private
string
stryaxistext =
"万元"
;
//y轴说明文字
private
string
[] strskeys =
new
string
[] {
"一月"
,
"二月"
,
"三月"
,
"四月"
,
"五月"
,
"六月"
,
"七月"
,
"八月"
,
"九月"
,
"十月"
,
"十一月"
,
"十二月"
};
//键
private
float
[] fltsvalues =
new
float
[] { 20.0f, 30.0f, 50.0f, 55.4f, 21.6f, 12.8f, 99.5f, 36.4f, 78.2f, 56.4f, 45.8f, 66.5f, 99.5f, 36.4f, 78.2f, 56.4f, 45.8f, 66.5f, 20.0f, 30.0f, 50.0f, 55.4f, 21.6f, 12.8f };
//值
private
color clrbgcolor = color.snow;
//背景色
private
color clrtextcolor = color.black;
//文字颜色
private
color clrbordercolor = color.black;
//整体边框颜色
private
color clraxiscolor = color.black;
//轴线颜色
private
color clraxistextcolor = color.black;
//轴说明文字颜色
private
color clrslicetextcolor = color.black;
//刻度文字颜色
private
color clrslicecolor = color.black;
//刻度颜色
private
color[] clrscurvecolors =
new
color[] { color.red, color.blue };
//曲线颜色
private
float
fltxspace = 100f;
//图像左右距离边缘距离
private
float
fltyspace = 100f;
//图像上下距离边缘距离
private
int
intfontsize = 9;
//字体大小号数
private
float
fltxrotateangle = 30f;
//x轴文字旋转角度
private
float
fltyrotateangle = 0f;
//y轴文字旋转角度
private
int
intcurvesize = 2;
//曲线线条大小
private
int
intfontspace = 0;
//intfontspace 是字体大小和距离调整出来的一个比较适合的数字
#region 公共属性
/// <summary>
/// 图像的宽度
/// </summary>
public
float
width
{
set
{
if
(value < 100)
{
fltwidth = 100;
}
else
{
fltwidth = value;
}
}
get
{
if
(fltwidth <= 100)
{
return
100;
}
else
{
return
fltwidth;
}
}
}
/// <summary>
/// 图像的高度
/// </summary>
public
float
height
{
set
{
if
(value < 100)
{
fltheight = 100;
}
else
{
fltheight = value;
}
}
get
{
if
(fltheight <= 100)
{
return
100;
}
else
{
return
fltheight;
}
}
}
/// <summary>
/// x轴刻度宽度
/// </summary>
public
float
xslice
{
set
{ fltxslice = value; }
get
{
return
fltxslice; }
}
/// <summary>
/// y轴刻度宽度
/// </summary>
public
float
yslice
{
set
{ fltyslice = value; }
get
{
return
fltyslice; }
}
/// <summary>
/// y轴刻度的数值宽度
/// </summary>
public
float
yslicevalue
{
set
{ fltyslicevalue = value; }
get
{
return
fltyslicevalue; }
}
/// <summary>
/// y轴刻度开始值
/// </summary>
public
float
yslicebegin
{
set
{ fltyslicebegin = value; }
get
{
return
fltyslicebegin; }
}
/// <summary>
/// 张力系数
/// </summary>
public
float
tension
{
set
{
if
(value < 0.0f && value > 1.0f)
{
flttension = 0.5f;
}
else
{
flttension = value;
}
}
get
{
return
flttension;
}
}
/// <summary>
/// 标题
/// </summary>
public
string
title
{
set
{ strtitle = value; }
get
{
return
strtitle; }
}
/// <summary>
/// 键,x轴数据
/// </summary>
public
string
[] keys
{
set
{ strskeys = value; }
get
{
return
strskeys; }
}
/// <summary>
/// 值,y轴数据
/// </summary>
public
float
[] values
{
set
{ fltsvalues = value; }
get
{
return
fltsvalues; }
}
/// <summary>
/// 背景色
/// </summary>
public
color bgcolor
{
set
{ clrbgcolor = value; }
get
{
return
clrbgcolor; }
}
/// <summary>
/// 文字颜色
/// </summary>
public
color textcolor
{
set
{ clrtextcolor = value; }
get
{
return
clrtextcolor; }
}
/// <summary>
/// 整体边框颜色
/// </summary>
public
color bordercolor
{
set
{ clrbordercolor = value; }
get
{
return
clrbordercolor; }
}
/// <summary>
/// 轴线颜色
/// </summary>
public
color axiscolor
{
set
{ clraxiscolor = value; }
get
{
return
clraxiscolor; }
}
/// <summary>
/// x轴说明文字
/// </summary>
public
string
xaxistext
{
set
{ strxaxistext = value; }
get
{
return
strxaxistext; }
}
/// <summary>
/// y轴说明文字
/// </summary>
public
string
yaxistext
{
set
{ stryaxistext = value; }
get
{
return
stryaxistext; }
}
/// <summary>
/// 轴说明文字颜色
/// </summary>
public
color axistextcolor
{
set
{ clraxistextcolor = value; }
get
{
return
clraxistextcolor; }
}
/// <summary>
/// 刻度文字颜色
/// </summary>
public
color slicetextcolor
{
set
{ clrslicetextcolor = value; }
get
{
return
clrslicetextcolor; }
}
/// <summary>
/// 刻度颜色
/// </summary>
public
color slicecolor
{
set
{ clrslicecolor = value; }
get
{
return
clrslicecolor; }
}
/// <summary>
/// 曲线颜色
/// </summary>
public
color[] curvecolors
{
set
{ clrscurvecolors = value; }
get
{
return
clrscurvecolors; }
}
/// <summary>
/// x轴文字旋转角度
/// </summary>
public
float
xrotateangle
{
get
{
return
fltxrotateangle; }
set
{ fltxrotateangle = value; }
}
/// <summary>
/// y轴文字旋转角度
/// </summary>
public
float
yrotateangle
{
get
{
return
fltyrotateangle; }
set
{ fltyrotateangle = value; }
}
/// <summary>
/// 图像左右距离边缘距离
/// </summary>
public
float
xspace
{
get
{
return
fltxspace; }
set
{ fltxspace = value; }
}
/// <summary>
/// 图像上下距离边缘距离
/// </summary>
public
float
yspace
{
get
{
return
fltyspace; }
set
{ fltyspace = value; }
}
/// <summary>
/// 字体大小号数
/// </summary>
public
int
fontsize
{
get
{
return
intfontsize; }
set
{ intfontsize = value; }
}
/// <summary>
/// 曲线线条大小
/// </summary>
public
int
curvesize
{
get
{
return
intcurvesize; }
set
{ intcurvesize = value; }
}
#endregion
/// <summary>
/// 自动根据参数调整图像大小
/// </summary>
public
void
fit()
{
//计算字体距离
intfontspace = fontsize + 5;
//计算图像边距
float
fltspace = math.min(width / 6, height / 6);
xspace = fltspace;
yspace = fltspace;
//计算x轴刻度宽度
xslice = (width - 2 * xspace) / (keys.length - 1);
//计算y轴刻度宽度和y轴刻度开始值
float
fltminvalue = 0;
float
fltmaxvalue = 0;
for
(
int
i = 0; i < values.length; i++)
{
if
(values[i] < fltminvalue)
{
fltminvalue = values[i];
}
else
if
(values[i] > fltmaxvalue)
{
fltmaxvalue = values[i];
}
}
if
(yslicebegin > fltminvalue)
{
yslicebegin = fltminvalue;
}
int
intyslicecount = (
int
)(fltmaxvalue / yslicevalue);
if
(fltmaxvalue % yslicevalue != 0)
{
intyslicecount++;
}
yslice = (height - 2 * yspace) / intyslicecount;
}
/// <summary>
/// 生成图像并返回bmp图像对象
/// </summary>
/// <returns></returns>
public
bitmap createimage()
{
initializegraph();
int
intkeyscount = keys.length;
int
intvaluescount = values.length;
if
(intvaluescount % intkeyscount == 0)
{
int
intcurvescount = intvaluescount / intkeyscount;
for
(
int
i = 0; i < intcurvescount; i++)
{
float
[] fltcurrentvalues =
new
float
[intkeyscount];
for
(
int
j = 0; j < intkeyscount; j++)
{
fltcurrentvalues[j] = values[i * intkeyscount + j];
}
drawcontent(
ref
objgraphics, fltcurrentvalues, clrscurvecolors[i]);
}
}
else
{
objgraphics.drawstring(
"发生错误,values的长度必须是keys的整数倍!"
,
new
font(
"宋体"
, fontsize + 5),
new
solidbrush(textcolor),
new
point((
int
)xspace, (
int
)(height / 2)));
}
return
objbitmap;
}
/// <summary>
/// 初始化和填充图像区域,画出边框,初始标题
/// </summary>
private
void
initializegraph()
{
//根据给定的高度和宽度创建一个位图图像
objbitmap =
new
bitmap((
int
)width, (
int
)height);
//从指定的 objbitmap 对象创建 objgraphics 对象 (即在objbitmap对象中画图)
objgraphics = graphics.fromimage(objbitmap);
//根据给定颜色(lightgray)填充图像的矩形区域 (背景)
objgraphics.drawrectangle(
new
pen(bordercolor, 1), 0, 0, width - 1, height - 1);
//画边框
objgraphics.fillrectangle(
new
solidbrush(bgcolor), 1, 1, width - 2, height - 2);
//填充边框
//画x轴,注意图像的原始x轴和y轴计算是以左上角为原点,向右和向下计算的
float
fltx1 = xspace;
float
flty1 = height - yspace;
float
fltx2 = width - xspace + xslice / 2;
float
flty2 = flty1;
objgraphics.drawline(
new
pen(
new
solidbrush(axiscolor), 1), fltx1, flty1, fltx2, flty2);
//画y轴
fltx1 = xspace;
flty1 = height - yspace;
fltx2 = xspace;
flty2 = yspace - yslice / 2;
objgraphics.drawline(
new
pen(
new
solidbrush(axiscolor), 1), fltx1, flty1, fltx2, flty2);
//初始化轴线说明文字
setaxistext(
ref
objgraphics);
//初始化x轴上的刻度和文字
setxaxis(
ref
objgraphics);
//初始化y轴上的刻度和文字
setyaxis(
ref
objgraphics);
//初始化标题
createtitle(
ref
objgraphics);
}
/// <summary>
/// 初始化轴线说明文字
/// </summary>
/// <param name="objgraphics"></param>
private
void
setaxistext(
ref
graphics objgraphics)
{
float
fltx = width - xspace + xslice / 2 - (xaxistext.length - 1) * intfontspace;
float
flty = height - yspace - intfontspace;
objgraphics.drawstring(xaxistext,
new
font(
"宋体"
, fontsize),
new
solidbrush(axistextcolor), fltx, flty);
fltx = xspace + 5;
flty = yspace - yslice / 2 - intfontspace;
for
(
int
i = 0; i < yaxistext.length; i++)
{
objgraphics.drawstring(yaxistext[i].tostring(),
new
font(
"宋体"
, fontsize),
new
solidbrush(axistextcolor), fltx, flty);
flty += intfontspace;
//字体上下距离
}
}
/// <summary>
/// 初始化x轴上的刻度和文字
/// </summary>
/// <param name="objgraphics"></param>
private
void
setxaxis(
ref
graphics objgraphics)
{
float
fltx1 = xspace;
float
flty1 = height - yspace;
float
fltx2 = xspace;
float
flty2 = height - yspace;
int
icount = 0;
int
islicecount = 1;
float
scale = 0;
float
iwidth = ((width - 2 * xspace) / xslice) * 50;
//将要画刻度的长度分段,并乘以50,以10为单位画刻度线。
float
fltsliceheight = xslice / 10;
//刻度线的高度
objgraphics.translatetransform(fltx1, flty1);
//平移图像(原点)
objgraphics.rotatetransform(xrotateangle, matrixorder.prepend);
//旋转图像
objgraphics.drawstring(keys[0].tostring(),
new
font(
"宋体"
, fontsize),
new
solidbrush(slicetextcolor), 0, 0);
objgraphics.resettransform();
//重置图像
for
(
int
i = 0; i <= iwidth; i += 10)
//以10为单位
{
scale = i * xslice / 50;
//即(i / 10) * (xslice / 5),将每个刻度分五部分画,但因为i以10为单位,得除以10
if
(icount == 5)
{
objgraphics.drawline(
new
pen(
new
solidbrush(axiscolor)), fltx1 + scale, flty1 + fltsliceheight * 1.5f, fltx2 + scale, flty2 - fltsliceheight * 1.5f);
//画网格虚线
pen pendashed =
new
pen(
new
solidbrush(axiscolor));
pendashed.dashstyle = dashstyle.dash;
objgraphics.drawline(pendashed, fltx1 + scale, flty1, fltx2 + scale, yspace - yslice / 2);
//这里显示x轴刻度
if
(islicecount <= keys.length - 1)
{
objgraphics.translatetransform(fltx1 + scale, flty1);
objgraphics.rotatetransform(xrotateangle, matrixorder.prepend);
objgraphics.drawstring(keys[islicecount].tostring(),
new
font(
"宋体"
, fontsize),
new
solidbrush(slicetextcolor), 0, 0);
objgraphics.resettransform();
}
else
{
//超过范围,不画任何刻度文字
}
icount = 0;
islicecount++;
if
(fltx1 + scale > width - xspace)
{
break
;
}
}
else
{
objgraphics.drawline(
new
pen(
new
solidbrush(slicecolor)), fltx1 + scale, flty1 + fltsliceheight, fltx2 + scale, flty2 - fltsliceheight);
}
icount++;
}
}
/// <summary>
/// 初始化y轴上的刻度和文字
/// </summary>
/// <param name="objgraphics"></param>
private
void
setyaxis(
ref
graphics objgraphics)
{
float
fltx1 = xspace;
float
flty1 = height - yspace;
float
fltx2 = xspace;
float
flty2 = height - yspace;
int
icount = 0;
float
scale = 0;
int
islicecount = 1;
float
iheight = ((height - 2 * yspace) / yslice) * 50;
//将要画刻度的长度分段,并乘以50,以10为单位画刻度线。
float
fltslicewidth = yslice / 10;
//刻度线的宽度
string
strslicetext =
string
.empty;
objgraphics.translatetransform(xspace - intfontspace * yslicebegin.tostring().length, height - yspace);
//平移图像(原点)
objgraphics.rotatetransform(yrotateangle, matrixorder.prepend);
//旋转图像
objgraphics.drawstring(yslicebegin.tostring(),
new
font(
"宋体"
, fontsize),
new
solidbrush(slicetextcolor), 0, 0);
objgraphics.resettransform();
//重置图像
for
(
int
i = 0; i < iheight; i += 10)
{
scale = i * yslice / 50;
//即(i / 10) * (yslice / 5),将每个刻度分五部分画,但因为i以10为单位,得除以10
if
(icount == 5)
{
objgraphics.drawline(
new
pen(
new
solidbrush(axiscolor)), fltx1 - fltslicewidth * 1.5f, flty1 - scale, fltx2 + fltslicewidth * 1.5f, flty2 - scale);
//画网格虚线
pen pendashed =
new
pen(
new
solidbrush(axiscolor));
pendashed.dashstyle = dashstyle.dash;
objgraphics.drawline(pendashed, xspace, flty1 - scale, width - xspace + xslice / 2, flty2 - scale);
//这里显示y轴刻度
strslicetext = convert.tostring(yslicevalue * islicecount + yslicebegin);
objgraphics.translatetransform(xspace - intfontsize * strslicetext.length, flty1 - scale);
//平移图像(原点)
objgraphics.rotatetransform(yrotateangle, matrixorder.prepend);
//旋转图像
objgraphics.drawstring(strslicetext,
new
font(
"宋体"
, fontsize),
new
solidbrush(slicetextcolor), 0, 0);
objgraphics.resettransform();
//重置图像
icount = 0;
islicecount++;
}
else
{
objgraphics.drawline(
new
pen(
new
solidbrush(slicecolor)), fltx1 - fltslicewidth, flty1 - scale, fltx2 + fltslicewidth, flty2 - scale);
}
icount++;
}
}
/// <summary>
/// 画曲线
/// </summary>
/// <param name="objgraphics"></param>
private
void
drawcontent(
ref
graphics objgraphics,
float
[] fltcurrentvalues, color clrcurrentcolor)
{
pen curvepen =
new
pen(clrcurrentcolor, curvesize);
pointf[] curvepointf =
new
pointf[keys.length];
float
keys = 0;
float
values = 0;
for
(
int
i = 0; i < keys.length; i++)
{
keys = xslice * i + xspace;
values = (height - yspace) + yslicebegin - yslice * (fltcurrentvalues[i] / yslicevalue);
curvepointf[i] =
new
pointf(keys, values);
}
objgraphics.drawcurve(curvepen, curvepointf, tension);
}
/// <summary>
/// 初始化标题
/// </summary>
/// <param name="objgraphics"></param>
private
void
createtitle(
ref
graphics objgraphics)
{
objgraphics.drawstring(title,
new
font(
"宋体"
, fontsize),
new
solidbrush(textcolor),
new
point((
int
)(width - xspace) - intfontsize * title.length, (
int
)(yspace - yslice / 2 - intfontspace)));
}
}
}
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我正在测量一些系统性能数据以将其存储在数据库中。根据这些数据点,我绘制了随时间变化的折线图。就其本质而言,这些数据点有点嘈杂,即。每个点都至少偏离局部平均值一点点。从一个点到下一个点直接绘制折线图时,
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