Examples of drawing with GDI

Today, I learned a small example of using GDI to draw images, which makes a small foreshadowing for the future study of GDI.

Using system;
Using system. drawing;
Using system. Windows. forms;
Using system. Drawing. drawing2d;

Namespace GDI _
{
Public partial class form1: Form
{
Public form1 ()
{
Initializecomponent ();
}


Private pointf (int p, int p_2)
{
Throw new notimplementedexception ();
}

Private void form=mousemove (Object sender, mouseeventargs E)
{
// Obtain the desktop coordinates
This. Text = string. Format ("x = {0}, y = {1}", E. X, E. y );
}

Private void button#click (Object sender, eventargs E)
{
Drawimage = new drawimage ();
Drawimage. OBJ = rtb_image.creategraphics ();
Drawimage. Draw ();
}

Private void textbox1_textchanged (Object sender, eventargs E)
{

}
}
Public class drawimage
{

// Attributes
/// <Summary>
/// This attribute is used to obtain different graphics objects (initial image 600*385)
/// </Summary>
Public graphics OBJ
{
Get;
Set;
}
// Drawing Method
Public void draw ()
{
Font font = new font ("", 9 );
// Determine the drawing path. The test is performed here.
Graphicspath gpath = new graphicspath ();
// Monthly profit data
Double [] DATA = {34.3, 65.7, 33.1, 87, 57.3, 56, 99, 56.3, 41.6, 48.1, 57.3 };
// Store the coordinates of the highest profit data point of each month
Pointf [] dotp = new system. Drawing. pointf [12];
// Fixed origin coordinates are not modified
Point O = new point (1, 35,350 );
// Redefine a pen with a front arrow
Pen = new pen (color. Red );
Pen. endcap = system. Drawing. drawing2d. linecap. arrowanchor;
// Create a graphics object
Graphics G = OBJ;
// Origin ID
G. drawstring ("O", Font, brushes. Black, O. X-5, O. Y + 5 );
// Draw the X axis
G. drawline (pen, o. x, O. Y, o. x + 550, O. Y );
// Draw the Y axis
G. drawline (pen, o. x, O. Y, o. x, O. Y-325 );
// Draw the X axis Scale (X, Y + 5) and month
For (INT I = 0; I <12; I ++)
{
G. drawline (pens. red, O. X + (I + 1) * 42, O. y, O. X + (I + 1) * 42, O. y-5 );
// Determine the month coordinates
Pointf monp = new system. Drawing. pointf (O. X + (I + 1) * 42-10, O. Y + 5 );
G. drawstring (string. Format ("{0} month", I + 1), Font, brushes. Green, monp );
// Determine the maximum profit point coordinates of each month
Pointf mofpp = new pointf (monp. X, O. Y-(float) data [I] * 3 );
Dotp [I] = mofpp;
// G. drawellipse (pens. seagreen, new rectanglef (mofpp. X, mofpp. Y, 2, 2 ));
Gpath. addellipse (New rectanglef (mofpp. X, mofpp. Y, 2, 2 ));
}
Gpath. addlines (dotp );
G. drawpath (pens. Purple, gpath );
// G. drawlines (pens. Plum, dotp );
// Draw Y axis coordinates (x, Y-5), profit 10 W = 30px ==> 1 W = 3px
For (INT I = 0; I <10; I ++)
{
G. drawline (pens. red, O. x, O. y-(I + 1) * 30, O. X + 5, O. y-(I + 1) * 30 );
// Determine the amount Coordinate
Pointf payp = new pointf (O. X-35, O. Y-(I + 1) * 30-8 );
G. drawstring (string. Format ("{0} million", (I + 1) * 10), Font, brushes. Green, payp );
}
Pen. Dispose (); // release the created pen object.
}
}
}

: