我正在编辑由谁知道的老师制作的节目。无论如何，它是显示存储在图表中显示的数组中的库存值。老师注意到图表Y轴不正确，但我们不必改变它。我们必须改变的是复选框的单选按钮，这样我们就可以在图表上显示多个股票价值。
因此，为了绘制新图，我们必须得到所选股票的最小和最大Y值。我决定去：
if (checkBox1.Checked == true)
{
GetStockValues(0);
maxVal[0] = StockArray.Max();
}
int maxValue = Convert.ToInt16(maxVal.Min());
return maxValue;
minValue也是如此。问题是我没有得到任何正确的数字。这是整个计划：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace VC2008_StockMktGraphics
{
public partial class frmMaster : Form
{
// let's make the stock values array be public so we don't have to pass
// them back and forth.
public double[] StockArray = new double[ 30 ] ;
public double[] minVal = new double [ 4 ];
public double[] maxVal = new double[4];
public frmMaster()
{
InitializeComponent();
}
private void frmMaster_Resize(object sender, EventArgs e)
{
this.Invalidate() ;
}
protected override void OnPaint(PaintEventArgs e)
{
int h = this.Bounds.Height ;
int w = this.Bounds.Width ;
Rectangle r = new Rectangle();
// Create the graphics context to draw into
Graphics gc = this.CreateGraphics() ;
Pen pBl = new Pen( Color.Black , 2) ;
SolidBrush sB = new SolidBrush(Color.Honeydew ) ;
// if the window is too small, force it to a size
if ( ( h < 200 ) || ( w < 200 ) )
{
this.Width = 200 ;
this.Height = 200 ;
}
// Set dynamic location of graphics box
r.X=Convert.ToInt32( Convert.ToDouble( w ) * 0.2 ) ;
r.Y=Convert.ToInt32( Convert.ToDouble( w ) * 0.2 ) ;
r.Width=Convert.ToInt32( Convert.ToDouble( w ) * 0.8 ) -r.X ;
r.Height=Convert.ToInt32( Convert.ToDouble( h ) * 0.8 -r.Y );
// draw the outer rectangle and fill with a light color
gc.DrawRectangle(pBl, r);
gc.FillRectangle(sB, r);
// set the location of the buttons
btnExit.Left = r.X + r.Width + 10;
btnExit.Top = 10;
chkStartAtZero.Left = r.X + r.Width + 10;
chkStartAtZero.Top = btnExit.Top + 25;
checkBox1.Left = r.X + r.Width + 10;
checkBox1.Top = chkStartAtZero.Top + 25;
checkBox2.Left = checkBox1.Left;
checkBox2.Top = checkBox1.Top + 25;
checkBox3.Left = checkBox2.Left;
checkBox3.Top = checkBox2.Top + 25;
checkBox4.Left = checkBox3.Left;
checkBox4.Top = checkBox3.Top + 25;
if (checkBox1.Checked == true)
DrawStock(0, gc, r);
if (checkBox2.Checked == true)
DrawStock(1, gc, r);
if (checkBox3.Checked == true)
DrawStock(2, gc, r);
if (checkBox4.Checked == true)
DrawStock(3, gc, r);
// dispose of object memories we've allocated
pBl.Dispose() ;
sB.Dispose();
gc.Dispose() ;
}
public void DrawStock( int iWhichStock , Graphics gc , Rectangle r )
{
int i ;
int iLabelX;
int iMinY = 999999;
int iMaxY = 0;
int iCnt;
double dxIncrement;
double dyIncrement;
string strAxisLabel;
Point pLineStart = new Point();
Point pLineEnd = new Point();
Pen pB2 = new Pen(Color.Red, 2);
Font f = new Font("Ariel", (float)10.0);
Brush b = new SolidBrush(Color.Blue);
// Normally, we'd get stock from a database, I'm just going to go
// get it from a function with hard-coded values for demonstration
// purposes.
iMinY = Convert.ToInt16(GetMin());
iMaxY = Convert.ToInt16(GetMax());
// Take the min and max to the next increment of 5 outside them.
iMinY = Convert.ToInt16( iMinY / 5 ) * 5 ;
iMaxY = ( Convert.ToInt16(iMaxY / 5 ) + 1 ) * 5 ;
// Find the number of x-coordinate values
iCnt = 0;
foreach (double d in StockArray)
{
if (d > 0)
iCnt++;
}
// so now we know how many x values there are to spread on the x-axis
dxIncrement = Convert.ToDouble(r.Width / iCnt);
// if the zero checkbox is checked, then we'll set the minimums to zero
if (chkStartAtZero.Checked == true)
{
iMinY = 0;
dMinStockValue = 0.0;
}
// so each y-axis pixel must contain this many dollars of actual stock price
dyIncrement = Convert.ToDouble(r.Height / (iMaxY - iMinY));
// set the starting point of the stock line
pLineStart.X = r.X;
pLineStart.Y = r.Top + r.Height -
Convert.ToInt16(dyIncrement * (StockArray[ 0 ] - Convert.ToDouble(iMinY) ) ) ;
// now graph them
for( i = 1 ; i < StockArray.Length ; i++ )
{
if( StockArray[i] == 0 )
continue ;
pLineEnd.X = pLineStart.X + Convert.ToInt16(dxIncrement);
pLineEnd.Y = r.Top + r.Height -
Convert.ToInt16(dyIncrement * (StockArray[i] - Convert.ToDouble(iMinY)));
gc.DrawLine(pB2,pLineStart, pLineEnd ) ;
pLineStart = pLineEnd ;
}
// now draw the y-axis labels
i = iMinY;
pLineStart.X = r.X;
pLineStart.Y = r.Top + r.Height - Convert.ToInt16(0);
pLineEnd.X = r.X - 8;
while( i <= iMaxY )
{
pLineStart.Y = r.Top + r.Height -
Convert.ToInt16( Convert.ToDouble(i-iMinY ) * dyIncrement ) ;
pLineEnd.Y = pLineStart.Y;
gc.DrawLine(pB2, pLineStart, pLineEnd);
strAxisLabel = Convert.ToString(i);
iLabelX = pLineEnd.X - 18;
if (i < 10)
iLabelX = pLineEnd.X - 8;
else
if (i < 100)
iLabelX = pLineEnd.X - 18;
else
if (i < 1000)
iLabelX = pLineEnd.X - 28;
gc.DrawString(strAxisLabel, f, b, iLabelX, pLineEnd.Y - 8);
i += 10;
}
}
public double GetMin()
{
if (checkBox1.Checked == true)
{
GetStockValues(0);
minVal[0] = StockArray.Min();
}
if (checkBox2.Checked == true)
{
GetStockValues(1);
minVal[1] = StockArray.Min();
}
if (checkBox3.Checked == true)
{
GetStockValues(2);
minVal[2] = StockArray.Min();
}
if (checkBox4.Checked == true)
{
GetStockValues(3);
minVal[3] = StockArray.Min();
}
int minValue = Convert.ToInt16(minVal.Min());
label1.Text = Convert.ToString(minValue);
return minValue;
}
public double GetMax()
{
if (checkBox1.Checked == true)
{
GetStockValues(0);
maxVal[0] = StockArray.Max();
}
if (checkBox2.Checked == true)
{
GetStockValues(1);
maxVal[1] = StockArray.Max();
}
if (checkBox3.Checked == true)
{
GetStockValues(2);
maxVal[2] = StockArray.Max();
}
if (checkBox4.Checked == true)
{
GetStockValues(3);
maxVal[3] = StockArray.Max();
}
int maxValue = Convert.ToInt16(maxVal.Min());
label2.Text = Convert.ToString(maxValue);
return maxValue;
}
public void GetStockValues(int iWhichStock)
{
if (iWhichStock == 0)
{
// IBM
StockArray[0] = 147.64; // 1-10-11
StockArray[1] = 147.28;
StockArray[2] = 149.10;
StockArray[3] = 148.82;
StockArray[4] = 150.00;
StockArray[5] = 150.65;
StockArray[6] = 155.69;
StockArray[7] = 155.80;
StockArray[8] = 155.50;
StockArray[9] = 159.63;
StockArray[10] = 161.44;
StockArray[11] = 161.04;
StockArray[12] = 161.07;
StockArray[13] = 159.21;
StockArray[14] = 162.00;
StockArray[15] = 163.56;
StockArray[16] = 163.30;
StockArray[17] = 163.53;
StockArray[18] = 164.00;
StockArray[19] = 164.83;
}
if (iWhichStock == 1)
{
// BA (The Boeing Company)
StockArray[0] = 69.09; // 1-10-11
StockArray[1] = 68.96;
StockArray[2] = 70.15;
StockArray[3] = 69.63;
StockArray[4] = 70.07;
StockArray[5] = 72.47;
StockArray[6] = 71.73;
StockArray[7] = 71.12;
StockArray[8] = 71.68;
StockArray[9] = 72.73;
StockArray[10] = 72.24;
StockArray[11] = 70.02;
StockArray[12] = 70.56;
StockArray[13] = 69.23;
StockArray[14] = 69.48;
StockArray[15] = 70.29;
StockArray[16] = 71.00;
StockArray[17] = 70.98;
StockArray[18] = 71.38;
StockArray[19] = 71.93;
}
if (iWhichStock == 2)
{
// CAP (CAI International
StockArray[0] = 19.44; // 1-10-11
StockArray[1] = 19.66;
StockArray[2] = 19.68;
StockArray[3] = 19.45;
StockArray[4] = 19.79;
StockArray[5] = 19.90;
StockArray[6] = 19.53;
StockArray[7] = 19.06;
StockArray[8] = 19.05;
StockArray[9] = 19.14;
StockArray[10] = 19.28;
StockArray[11] = 20.11;
StockArray[12] = 19.74;
StockArray[13] = 19.06;
StockArray[14] = 19.04;
StockArray[15] = 20.03;
StockArray[16] = 19.69;
StockArray[17] = 19.56;
StockArray[18] = 19.61;
StockArray[19] = 19.63;
}
if (iWhichStock == 3)
{
// TOT (Total Societe Anonyme)
StockArray[0] = 53.00; // 1-10-11
StockArray[1] = 53.32;
StockArray[2] = 55.00;
StockArray[3] = 56.03;
StockArray[4] = 57.11;
StockArray[5] = 57.10;
StockArray[6] = 56.95;
StockArray[7] = 57.12;
StockArray[8] = 57.12;
StockArray[9] = 58.04;
StockArray[10] = 58.79;
StockArray[11] = 58.69;
StockArray[12] = 59.00;
StockArray[13] = 59.50;
StockArray[14] = 57.80;
StockArray[15] = 58.77;
StockArray[16] = 61.03;
StockArray[17] = 60.70;
StockArray[18] = 59.76;
StockArray[19] = 59.25;
}
}
private void btnExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void chkStartAtZero_CheckedChanged(object sender, EventArgs e)
{
this.Invalidate();
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
this.Invalidate();
}
private void checkBox2_CheckedChanged(object sender, EventArgs e)
{
this.Invalidate();
}
private void checkBox3_CheckedChanged(object sender, EventArgs e)
{
this.Invalidate();
}
private void checkBox4_CheckedChanged(object sender, EventArgs e)
{
this.Invalidate();
}
private void frmMaster_Load(object sender, EventArgs e)
{
}
}
}
答案 0 :(得分：1)
一些问题。
您的主要问题是在int maxValue = Convert.ToInt16(maxVal.Min());中致电GetMax()，我认为您需要int maxValue = Convert.ToInt16(maxVal.Max());。
但是，一旦你修复了这个问题，你就会发现你正在比较maxVal数组的未初始化/旧值。
假设我只选中了复选框1和3，然后我取消检查3，运行第二次GetMax或GetMin时，maxVal [2]的值是多少（这是一个提示，它不是0）< / p>