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GDI+ Examples: Drawing Column Chart

 
 
Column Chart

Introduction

 

A chart is a technique of representing numeric values using colored shapes. The shape(s) can be geometric or not. To draw such a chart, you can use your knowledge of GDI+ techniques. In this exercise, we use the Graphics::DrawRectangle() method to draw a series of rectangles that represent a column chart.

 

Practical LearningPractical Learning: Creating the Chart

 
  1. Start a new Windows Forms Application named WeeklySales1
  2. Design the form as follows:
     
  3. Right-click the form and click View Code and declare the following two variables:
     
    private:
    	/// <summary>
    	/// Required designer variable.
    	/// </summary>
    	System::ComponentModel::Container ^components;
    	Graphics ^ graphDrawingArea;
    	Bitmap   ^ bmpDrawingArea;
  4. Return to the form
  5. Double-click an unoccupied area on the form and implement its Load event as follows:
     
    System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e)
    {
    	 bmpDrawingArea   = gcnew Bitmap(Width, Height);
    	 graphDrawingArea = Graphics::FromImage(bmpDrawingArea);
    }
  6. Return to the form and click an empty area on it. In the Properties window, click the Events button Events
  7. Double-click the Paint field and implement its event as follows:
     
    System::Void Form1_Paint(System::Object^  sender, 
    	System::Windows::Forms::PaintEventArgs^  e)
    {
    	 e->Graphics->DrawImage(bmpDrawingArea, 0, 0);
    }
  8. Return to the form
  9. Double-click the Generate button and implement its Click event as follows:
     
    System::Void btnGenerate_Click(System::Object^  sender,
    				 System::EventArgs^  e)
    {
    	 double monday = double::Parse(this->txtMonday->Text) / 100;
    	 double tuesday = double::Parse(this->txtTuesday->Text) / 100;
    	 double wednesday = double::Parse(this->txtWednesday->Text) / 100;
    	 double thursday = double::Parse(this->txtThursday->Text) / 100;
    	 double friday = double::Parse(this->txtFriday->Text) / 100;
    
    	 graphDrawingArea->Clear(this->BackColor);
    
    	 graphDrawingArea->FillRectangle(gcnew SolidBrush(Color::Red),       
    					 this->txtMonday->Left+5,    
    					 280-monday,    40, monday);
    	 graphDrawingArea->DrawRectangle(gcnew Pen(Color::Black),            
    					 this->txtMonday->Left+5,    
    					 280-monday,    40, monday);
    	 graphDrawingArea->FillRectangle(gcnew SolidBrush(Color::Blue),      
    					 this->txtTuesday->Left+5,   
    					 280-tuesday,   40, tuesday);
    	 graphDrawingArea->DrawRectangle(gcnew Pen(Color::Black),            
    					 this->txtTuesday->Left+5,   
    					 280-tuesday,   40, tuesday);
    	 graphDrawingArea->FillRectangle(gcnew SolidBrush(Color::Fuchsia),   
    					 this->txtWednesday->Left+5, 
    					 280-wednesday, 40, wednesday);
    	 graphDrawingArea->DrawRectangle(gcnew Pen(Color::Black),            
    					 this->txtWednesday->Left+5, 
    					 280-wednesday, 40, wednesday);
    	 graphDrawingArea->FillRectangle(gcnew SolidBrush(Color::Brown),     
    					 this->txtThursday->Left+5,  
    					 280-thursday,  40, thursday);
    	 graphDrawingArea->DrawRectangle(gcnew Pen(Color::Black),            
    					 this->txtThursday->Left+5,  
    					 280-thursday,  40, thursday);
    	 graphDrawingArea->FillRectangle(gcnew SolidBrush(Color::Turquoise), 
    					 this->txtFriday->Left+5,    
    					 280-friday,    40, friday);
    	 graphDrawingArea->DrawRectangle(gcnew Pen(Color::Black),            
    					 this->txtFriday->Left+5,    
    					 280-friday,    40, friday);
    
    	 graphDrawingArea->DrawRectangle(gcnew Pen(Color::Black), 
    					 10, 280, Width - 30, 1);
    	 Invalidate();
    }
  10. Execute the application and test the form
     
     Column Chart
  11. After using it, close the form

 

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