tailieunhanh - GDI+

GDI+'s Objectives is introduction to graphics with x; the graphics class; introduction to graphics Objects; understanding the font class; working with advanced GDI+. It includes GDI+ class; Device Context – Graphics Objects and something else. | GDI+ Objectives GDI+ class Create and render Graphic Display information on the computer screen, printer Device Context – Graphics Objects Device Context is a DataStructure that contains information about different graphic objects Pen, Brush Draws Image, Graphics on any device Graphics Objects : Pen ( draw lines ) , Brush Graphics Object To Draw various object on any device Graphics Object Method Steps : Get Graphics Object Make a Pen object Call DrawXXX method Color structure Provided by the GDI+ to provide various Color This structure defines the alpha , red , green , blue value , which are the four primary components of the structure Alpha component increase the transparency of the color. Color - Method Pen class Brush class Graphical shapes can be filled with color by using the Brush class This is a abstract class – therefore you can use its derived classes bellow : Font class Provide the font face,size and style attributes to format text ( namespace) GDI fonts : ( in folder Fonts of system- “Arial”) Device fonts are used for output devices such as monitors or printers Display Image Printing GDI+ Object Using PrintDocument class to print data and Image Double Buffering One of the most problem with a complex image ( complex combination of shapes, text ) is that they flicker. Another reason for flickering is the frequent redrawing of images on the control To overcome the problem , .NET provide the Double Buffering technique – all the drawing operations is first performed in a buffer memory. Then , from the buffer, the image is drawn on the target screen. How to To implement DoubleBuffering technique, you can set the DoubleBufferred property of the Control class to TRUE Alternatively , you can also invoke the SetStyle() methol of the Control class to set the OptimizedDoubleBuffer value to TRUE. Summary | GDI+ Objectives GDI+ class Create and render Graphic Display information on the computer screen, printer Device Context – Graphics Objects Device Context is a DataStructure that contains information about different graphic objects Pen, Brush Draws Image, Graphics on any device Graphics Objects : Pen ( draw lines ) , Brush Graphics Object To Draw various object on any device Graphics Object Method Steps : Get Graphics Object Make a Pen object Call DrawXXX method Color structure Provided by the GDI+ to provide various Color This structure defines the alpha , red , green , blue value , which are the four primary components of the structure Alpha component increase the transparency of the color. Color - Method Pen class Brush class Graphical shapes can be filled with color by using the Brush class This is a abstract class – therefore you can use its derived classes bellow : Font class Provide the font face,size and style attributes to