GDI+ Drawing, GDI+ Examples, Drawing Chart, Graphics, Free C++ Source Code

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GDI+ Examples: Drawing 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 Learning: Creating the Chart

Start a new Windows Forms Application named WeeklySales1
Design the form as follows:

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;

Return to the form

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);
}

Return to the form and click an empty area on it. In the Properties window, click the Events button

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);
}

Return to the form

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();
}

Execute the application and test the form
After using it, close the form

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