C # GDI + simple plotting (1)

Latest pair GDI + This item has many contacts and some simple examples, such as drawing board and Imitation Qq And so on.

I first came into contact with this class because I wanted to copy it.QqAfter learning how to do it,. NetThe teacher is about to talk aboutC #Drawing knowledge, and I have learned the training courses of instructor Jin on the Internet, I also want to use this class. I have some experience in learning, so I want to write down these experiences. Because there are many content, I may write it several times.

Let's get to know this.GDI +To see what it looks like..

GDI + : Graphics Device Interface plus That is, the graphic device interface. , Provides a variety of graphic image processing functions ; In C #. net , Use GDI + Processing two-dimensional ( 2d ). DirectX Processing 3D ( 3D ). , The main namespace used for image processing is System. Drawing : Provides GDI + Access to basic graphic functions mainly includes Graphics Class, Bitmap Class, slave Brush Class inherited class, Font Class, Icon Class, Image Class, Pen Class, Color Class .

What is GDI + After , Let's take a look at the main tools used for plotting. , Drawing , YesCanvasRight , In C # You can use Graphics This class is used to create , With the canvas , Always get onePenWhat? , Otherwise, why? , It's hard. . Pen can be divided into many types , For example, pencil , Image painter . Their main difference is that pencils can be used to draw lines. , What about image painter? , Hey , Consider it yourself . In C # We can use Pen, brush Class to implement similar functions . Pigments are used naturally. Color Class .

With tools,Let's get started.! (Required namespace: using system. Drawing ;)

Effect:Draw a basic image in a blank form

First Prepare a canvas :
Creating an artboard mainly includes 3 Method :
A: In Paint Direct reference in the event Graphics Object
B: Using a form or a widget's Creategraphics Method
C: Create from any object inherited from the image Graphics Object
This time, we will start A For example, describe the problem :

  Private   Void Form1_paint ( Object Sender, painteventargs E)
{
Graphics g=E. graphics;//Create a canvas. The canvas here is provided by form.
}

Then,We only need a pen:

Private   Void Form1_paint ( Object Sender, painteventargs E)
{
Graphics g = E. graphics; // Create a canvas. The canvas here is provided by form.
Pen P =   New Pen (color. Blue, 2 ); // Defines a blue, width-based brush.
}

NextSo we can paint..

Private   Void Form1_paint ( Object Sender, painteventargs E)
{
Graphics g = E. graphics; // Create a canvas. The canvas here is provided by form.
Pen P =   New Pen (color. Blue, 2 ); // Defines a blue, width-based brush.
G. drawline (p, 10 , 10 , 100 , 100 ); // Draw a straight line on the drawing board. The starting coordinate is (10, 10), and the ending coordinate is (100,100)
G. drawrectangle (p, 10 , 10 , 100 , 100 ); // Draw a rectangle on the canvas. The start coordinate is (10, 10), the width is, and the height is
G. drawellipse (p, 10 , 10 , 100 , 100 ); // Draw an ellipse on the drawing board. The starting coordinate is (10, 10), the width of the external rectangle is, and the height is
}

As follows::

 

This filmArticleIn fact, I also posted a blog http://blog.54master.com/index.php/586951/ in my, but the continuous film has not been sent, do not know what's going on, so move to this, re-send!

 

Other links:

C # GDI + simple drawing (1): introduce the basic knowledge of GDI +

C # GDI + simple drawing (2): Introduce the knowledge of GDI + drawing

C # GDI + simple drawing (3): implement the QQ imitation Function

C # GDI + simple drawing (4): implement the windows-like drawing board Function