Pictures of various rotations, changes in size

1, all kinds of rotation, change the size

Note: To first add paint-related

Using

Reference.

//

Rotate the image to the right

90

° Code is as follows

:

private void Form1_paint (object sender, System.Windows.Forms.PaintEventArgs e)

{

Graphics g = e.graphics;

Bitmap bmp = New Bitmap ("rama.jpg");//

Loading images

G.fillrectangle (Brushes.white, this. ClientRectangle);//

Fill the form with white background

Point[] Destinationpoints = {

New Point (0),//destination to Upper-left point of original

New Point (+),//destination for Upper-right point of original

New Point (0, 0)}; Destination for Lower-left Point of original

G.drawimage (BMP, Destinationpoints);

}

//

Rotate image

180

° Code is as follows

:

private void Form1_paint (object sender, System.Windows.Forms.PaintEventArgs e)

{

Graphics g = e.graphics;

Bitmap bmp = New Bitmap ("rama.jpg");

G.fillrectangle (Brushes.white, this. ClientRectangle);

Point[] Destinationpoints = {

New Point (0, +),//destination for Upper-left point of original

New Point (+),//destination for Upper-right point of original

New Point (0, 0)}; Destination for Lower-left Point of original

G.drawimage (BMP, Destinationpoints);

}

//

Image Shear Code

:

private void Form1_paint (object sender, System.Windows.Forms.PaintEventArgs e)

{

Graphics g = e.graphics;

Bitmap bmp = New Bitmap ("rama.jpg");

G.fillrectangle (Brushes.white, this. ClientRectangle);

Point[] Destinationpoints = {

New Point (0, 0),//destination to Upper-left point of original

New Point (0),//destination to Upper-right point of original

New Point (};//) destination to Lower-left point of original

G.drawimage (BMP, Destinationpoints);

}

//

Image interception

:

private void Form1_paint (object sender, System.Windows.Forms.PaintEventArgs e)

{

2

Graphics g = e.graphics;

Bitmap bmp = New Bitmap ("rama.jpg");

G.fillrectangle (Brushes.white, this. ClientRectangle);

Rectangle sr = new Rectangle (80, 60, 400, 400);//

The rectangular area to intercept

Rectangle dr = new Rectangle (0, 0, 200, 200);//

To display to

Form

The rectangular area

G.drawimage (BMP, Dr, Sr, GraphicsUnit.Pixel);

}

//

Change image size

:

private void Form1_paint (object sender, System.Windows.Forms.PaintEventArgs e)

{

Graphics g = e.graphics;

Bitmap bmp = New Bitmap ("rama.jpg");

G.fillrectangle (Brushes.white, this. ClientRectangle);

int width = bmp. Width;

int height = bmp. Height;

//

Change image size using low-quality mode

G.interpolationmode = Interpolationmode.nearestneighbor;

G.drawimage (BMP, New Rectangle (Ten, ten, +),//Source Rectangle

New Rectangle (0, 0, width, height),//Destination Rectangle

GraphicsUnit.Pixel);

//

Use high-quality mode

g.compositingquality = Compositingquality.highspeed;

G.interpolationmode = Interpolationmode.highqualitybicubic;

G.drawimage (

Bmp

New Rectangle (130, 10, 120, 120),

New Rectangle (0, 0, width, height),

GraphicsUnit.Pixel);

}

//

Set the resolution of an image

:

private void Form1_paint (object sender, System.Windows.Forms.PaintEventArgs e)

{

Graphics g = e.graphics;

Bitmap bmp = New Bitmap ("rama.jpg");

G.fillrectangle (Brushes.white, this. ClientRectangle);

Bmp. Setresolution (300f, 300f);

G.drawimage (BMP, 0, 0);

Bmp. Setresolution (1200f, 1200f);

G.drawimage (BMP, 180, 0);

}

//

Use

Gdi+

Drawing

3

private void Form1_paint (object sender, System.Windows.Forms.PaintEventArgs e)

{

Graphics gForm = e.graphics;

Gform.fillrectangle (Brushes.white, this. ClientRectangle);

for (int i = 1; I <= 7; ++i)

{

//

Draw an orange rectangle on the form

Rectangle r = new Rectangle (i*40-15, 0, 15,

This. Clientrectangle.height);

Gform.fillrectangle (Brushes.orange, R);

}

//

In memory, create a

Bitmap

and set

CompositingMode

Bitmap bmp = new Bitmap (260, 260,

SYSTEM.DRAWING.IMAGING.PIXELFORMAT.FORMAT32BPPARGB);

Graphics gbmp = graphics.fromimage (BMP);

Gbmp.compositingmode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;

//

Create a

Alpha

The red area

//

and draw it in the memory bitmap.

Color red = Color.FromArgb (0x60, 0xff, 0, 0);

Brush Redbrush = new SolidBrush (red);

Gbmp.fillellipse (Redbrush, 70, 70, 160, 160);

//

Create a

Alpha

The green area

Color green = Color.FromArgb (0x40, 0, 0xFF, 0);

Brush Greenbrush = new SolidBrush (green);

Gbmp.fillrectangle (Greenbrush, 10, 10, 140, 140);

//

Draw a bitmap on a form

Now draw the bitmap in our window

Gform.drawimage (BMP, +, BMP). Width, BMP. Height);

//

Clean up resources

Bmp. Dispose ();

Gbmp.dispose ();

Redbrush.dispose ();

Greenbrush.dispose ();

}

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Rotate, change size of picture