Object-Oriented Programming ideas from the production of a public opinion survey (4)

Public MyChart ()
{
//
// TODO: Add Constructor Logic here
//
M_arrItems = new ArrayList ();
M_strTitle = "\";
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}

/// <Summary>
/// Overload Constructor
/// </Summary>
/// <Param name = "a_strTitle"> </param>
/// <Param name = "a_objBackColor"> </param>
/// <Param name = "a_intWidth"> </param>
/// <Param name = "a_intHeight"> </param>
/// <Param name = "a_intChartType"> </param>
/// <Param name = "a_strUnit"> </param>
Public MyChart (string a_strTitle, System. Drawing. Color a_objBackColor,
Int a_intWidth, int a_intHeight, ChartType a_intChartType, string a_strUnit)
{
M_arrItems = new ArrayList ();
M_strTitle = a_strTitle;
M_objBackColor = a_objBackColor;
M_intWidth = a_intWidth;
M_intHeight = a_intHeight;
M_intChartType = a_intChartType;
M_intTotalCount = 0;
M_strUnit = a_strUnit;
}

/// <Summary>
/// Add a new statistical chart item
/// </Summary>
/// <Param name = "a_objItem"> </param>
Public void AddItem (object a_objItem)
{
If (a_objItem is MyClass. Util. ChartItem)
{
M_arrItems.Add (a_objItem );
M_intTotalCount + = (ChartItem) a_objItem). Count;
}
Else
{
Throw (new Exception ("object type error, which must be a ChartItem object "));
}
}

/// <Summary>
/// Generate a Statistical Chart Image
/// </Summary>
/// <Param name = "a_strFileName"> name of the file to be saved </param>
/// <Remarks>
/// A_strFileName must be an absolute physical path
/// </Remarks>
Public void Create (string a_strFileName)
{
// If no Statistical Chart item is defined, an exception is thrown.
If (m_arrItems.Count = 0)
{
Throw (new Exception ("No Statistical Chart item defined "));
}

// Select a function based on different statistical chart types
Switch (m_intChartType)
{
Case ChartType. Bar:
DrawBar (a_strFileName );
Break;

Case ChartType. Pie:
DrawPie (a_strFileName );
Break;

Case ChartType. Curve:
DrawCurve (a_strFileName );
Break;

Default:
DrawPie (a_strFileName );
Break;
}

}

/// <Summary>
/// Draw a bar chart
/// </Summary>
/// <Param name = "a_strFileName"> name of the image to be saved </param>
Protected void DrawBar (string a_strFileName)
{
// Prepare the drawing. Create an image object and a graphics object.
System. Drawing. Image myBmp = new Bitmap (m_intWidth, m_intHeight );
System. Drawing. Graphics g = Graphics. FromImage (myBmp );

// Fill in the background
G. FillRectangle (new System. Drawing. SolidBrush (m_objBackColor), 0, 0, m_intWidth, m_intHeight );

// If no answer is provided, no result is displayed.
If (this. m_intTotalCount = 0)
{
G. DrawString ("no statistics! ", New Font (" ", m_intWidth/14 ),
New SolidBrush (Color. Red), (m_intWidth-m_intWidth/8*6)/2,
M_intHeight/2-m_intWidth/8 );
}
Else
{

// Write a question

// G. DrawString (m_strTitle, new System. Drawing. Font ("", m_intWidth/30 ),
// New System. Drawing. SolidBrush (Color. Black), (m_intWidth-m_strTitle.Length * (m_intWidth/30)/2, 10,
// System. Drawing. StringFormat. GenericDefault );

// Draw the rectangle of the Statistical Chart item
// Calculate the width of each rectangle
Int intWidth = m_intWidth/(m_arrItems.Count * 2-1 );

// Define a pixel-wide black pen
System. Drawing. Pen pen = new System. Drawing. Pen (new System. Drawing. SolidBrush (Color. Black), 1 );

For (int I = 0; I <m_arrItems.Count; I ++)
{
ChartItem item = (ChartItem) m_arrItems [I];

// Percentage calculated
Float intPercent = (float) Decimal. Divide (item. Count * 100, m_intTotalCount );

// Calculate the rectangle height
Int intHeight = (int) (m_intHeight/3*2 * intPercent/100-10 );

// Calculate the rectangle Coordinate
Int ix = intWidth * I * 3/2 + intWidth;
Int iy = m_intHeight/3*2-intHeight;

// Draw a rectangle
G. FillRectangle (new System. Drawing. SolidBrush (item. Color ),
Ix, iy, intWidth, intHeight + 10 );

// Write
// Calculate the font size
Int intFontSize = intWidth/this. TotalCount. ToString (). Length;
// Limit the font size to 12
IntFontSize = intFontSize> 12? 12: intFontSize;
G. DrawString (item. Count. ToString () + m_strUnit,
New System. Drawing. Font ("", intFontSize ),
New System. Drawing. SolidBrush (item. Color ),
Ix, iy-intFontSize * 2 );

// Draw a legend

// Calculate the font size
IntFontSize = m_intHeight/3/m_arrItems.Count/2-1;
IntFontSize = intFontSize> 12? 12: intFontSize;
G. FillRectangle (new System. Drawing. SolidBrush (item. Color), 20,
M_intHeight/3*2 + intFontSize * (I * 2 + 1) + 5,
IntFontSize, intFontSize );
G. DrawString (intPercent. ToInt32 (). ToString () + "% ",
New System. Drawing. Font ("", intFontSize ),
New System. Drawing. SolidBrush (item. Color ),
20 + intFontSize,
M_intHeight/3*2 + intFontSize * (I * 2 + 1) + 5 );
G. DrawString (item. Text,
New System. Drawing. Font ("", intFontSize ),
New System. Drawing. SolidBrush (item. Color), 80,
M_intHeight/3*2 + intFontSize * (I * 2 + 1) + 5 );

}

// Draw a line
G. DrawLine (pen, 0, 10, 0, m_intHeight/3*2 + 10 );
G. DrawLine (pen, 0, m_intHeight/3*2 + 10, m_intWidth,
M_intHeight/3*2 + 10 );
For (int I = 0; I <10; I ++)
{
G. DrawLine (pen, 0, m_intHeight/3*2/10 * I + 10,
5, m_intHeight/3*2/10 * I + 10 );
}

// Write unit
// G. DrawString ("unit:" + m_strUnit, new System. Drawing. Font ("", m_intWidth/40 ),
// New SolidBrush (Color. Black), 10, 10 );

// Clear
Pen. Dispose ();
}

// Clear control object
G. Dispose ();

// Save as jpg
Try
{
MyBmp. Save (a_strFileName, System. Drawing. Imaging. ImageFormat. JPEG );
}
Catch (Exception e)
{
Throw (new Exception ("failed to save the image:" + e. ToString ()));
}

MyBmp. Dispose ();

}

/// <Summary>
/// Pie chart
/// </Summary>
/// <Param name = "a_strFileName"> </param>
/// <Remarks>
/// This program is difficult to understand, because the size of the pie chart and text needs to be determined based on the image size, so all Calculation Methods
/// All are tested.
/// </Remarks>
Protected void DrawPie (string a_strFileName)
{
// Prepare the drawing. Create an image object and a graphics object.
System. Drawing. Image myBmp = new Bitmap (m_intWidth, m_intHeight );
System. Drawing. Graphics g = Graphics. FromImage (myBmp );

// Fill in the background
G. FillRectangle (new System. Drawing. SolidBrush (m_objBackColor), 0, 0, m_intWidth, m_intHeight );

// If no answer is provided, no result is displayed.
If (this. m_intTotalCount = 0)
{
G. DrawString ("no statistics! ", New Font (" ", m_intWidth/14 ),
New SolidBrush (Color. Red), (m_intWidth-m_intWidth/8*6)/2,
M_intHeight/2-m_intWidth/8 );
}
Else
{
// Define a floating point variable and remember the end point of the previous project
Int intAngel = 180;

// Create a pie chart
For (int I = 0; I <m_arrItems.Count; I ++)
{
ChartItem item = (ChartItem) m_arrItems [I];

// Starts from 180 degrees.

// Percentage calculated
Float intPercent = (float) Decimal. Divide (item. Count * 100, m_intTotalCount );
If (I = m_arrItems.Count-1)
{
G. FillPie (new SolidBrush (item. Color), 0, 0, m_intWidth * 2/3,
M_intHeight * 2/3, intangels, 540-intAngel );
}
Else
{
G. FillPie (new SolidBrush (item. Color), 0, 0, m_intWidth * 2/3,
M_intHeight * 2/3, intAngel, 360 * intPercent/100 );
IntAngel + = (int) (360 * intPercent/100 );
}

// Percentage of legends on the right of the pie chart
// Calculate the rectangle size
Int intRectSize = m_intHeight/30;

// Draw color blocks
G. FillRectangle (new SolidBrush (item. Color), m_intWidth * 2/3 + intRectSize,
IntRectSize * (I * 2 + 1) + m_intHeight/2-m_arrItems.Coun