This page describes gfx, a simple graphics library for CSE 20211.This library is meant to be simple and easy to learn, so that beginningCSE students can get right into the interesting parts of programming.The

Graphics.h This interface provides access to a simple graphics library that makes it possible to draw lines, rectangles, ovals, arcs, polygons, images, and strings on a graphical window. If you want to use graphics.h on Ubuntu platform you need to compile and install libgraph. It is the implementation of turbo c graphics API on Linux using SDL. It is the implementation of turbo c graphics API on Linux using SDL. Gfx.c (the source file: read if you like, but don't change) gfx.h (the header file: read if you like, but don't change) example.c (an example program: go ahead and change this) To compile a program that uses the gfx library, you need to use the following command, which compiles your program with gfx.c then adds the X11 and math libraries. Graphics.h is used for drawing graphics in c language. You can draw the different shapes, graphs, or write your name using this library in c language. This library is pretty cool. But questions come in our mind that how to include graphics.h library in our CodeBlocks software and can start drawing amazing graphics.

gfx library only requires that the programmer understandhow to invoke basic C functions with scalar arguments.

It is more than enough to explore raster and vector graphics,create animations, draw fractal shapes, and write simple video games. It doesn't do everything that you might want a graphicslibrary to do. As you learn more about programming, more advancedlibraries that you might consider using are OpenGL for precise 3-D graphics, Qt for windowed applications, and SDL for video games.

This library runs on Linux machines using the X11 Window System. (You may be able to run it on a Mac, but it won't work on Windows.) So, you will have to go to the computer lab to work on this assignment.

Getting Started

Download the following files and put them in your lab directory:

gfx.c (the source file: read if you like, but don't change)

gfx.h (the header file: read if you like, but don't change)

example.c (an example program: go ahead and change this)

To compile a program that uses the gfx library, you need touse the following command, which compiles your program with gfx.cthen adds the X11 and math libraries. (X11 is short for the X Window System used on Unix based machines.)

On a Mac with XCode and the X Windows option installed, the following might work:Run the example program, and you should see a window pop up with a green triangle.

Line by Line Example

To give you the idea of how to use the library, we will point outthe important parts of example.c in detail. Then, belowyou can read about how the individual functions work.

Begin by including gfx.h, to make the library available to the program. Note that quotes rather than angle brackets are used in this statement. Quotes indicate the header file is in the current directory, rather than in some system-defined place.

To open a graphics window, call gfx_open once at the beginning of the program, giving the width and height of the window in pixels, and the title of the window on the screen:gfx_color sets the current drawing color to a pale green:Now, use the gfx_line function to draw a line from (100,100) to (200,100):Wait for the user to press a key (or button):If the key is the letter 'q', break out of the loop:That shows you enough to get started.There are a few more useful functions in the library,read the following section to see them all.

Function Reference

gfx_open creates a new graphics window on the screen.width is the width of the window in pixels.height is the height of the window in pixels.title is the name of the window in the title bar.gfx_line draws a line in the graphics window, using thecurrent color, from location x1,y1 to x2,y2gfx_color sets the current color for drawing, using the RGB color model, in which you mix red, green, and blue components in order to get the desired color. gfx_color takes three integers between 0 and 255, each representing red, green, and blue. The following are some example colors:

Graphics.h Header File C++

Red	Green	Blue	Color Name
255	0	0	Red
0	255	0	Green
0	0	255	Blue
255	255	0	Yellow
255	255	255	White
100	100	100	Gray
0	0	0	Black

gfx_clear clears the window to the current background color,which is black by default.gfx_clear_color changes the background color, usingthe same format as gfx_clear above. The new backgroundcolor takes effect the next time

Graphics.h File For Dev C++ Download

gfx_clear is called.gfx_wait waits until the user presses a key or mouse button.If the user has pressed a mouse button, the integer 1, 2, or 3 will be returned,indicating the button pressed. If the user has pressed a key, that characterwill be returned. To determine the mouse location at that time, call gfx_xpos and gfx_ypos.gfx_xpos() and gfx_ypos return the X and Y coordinates, respectively, of the mouse pointerwhen the last key or button was pressed.gfx_wait causes the program to wait until something is pressed,which can be inconvenient in a real-time program. To avoid this, callgfx_event_waiting, which returns true if an event (key or button press)has occurred, otherwise returns false immediately. If it returns true, thenyou can call gfx_wait to retrieve the event without waiting.gfx_flush flushes all output to the graphics window.This forces all previous drawing commands to take effect.Output is normally flushed after a called to gfx_wait.If your program does not call gfx_wait then you needto call gfx_flush after drawing to the screen.This page describes gfx, a simple graphics library for CSE 20211.This library is meant to be simple and easy to learn, so that beginningCSE students can get right into the interesting parts of programming.The gfx library only requires that the programmer understandhow to invoke basic C functions with scalar arguments.

It is more than enough to explore raster and vector graphics,create animations, draw fractal shapes, and write simple video games. It doesn't do everything that you might want a graphicslibrary to do. As you learn more about programming, more advancedlibraries that you might consider using are OpenGL for precise 3-D graphics, Qt for windowed applications, and SDL for video games.

This library runs on Linux machines using the X11 Window System. (You may be able to run it on a Mac, but it won't work on Windows.) So, you will have to go to the computer lab to work on this assignment.

Getting Started

Download the following files and put them in your lab directory:

gfx.c (the source file: read if you like, but don't change)

gfx.h (the header file: read if you like, but don't change)

example.c (an example program: go ahead and change this)

To compile a program that uses the gfx library, you need touse the following command, which compiles your program with gfx.cthen adds the X11 and math libraries. (X11 is short for the X Window System used on Unix based machines.)

On a Mac with XCode and the X Windows option installed, the following might work:Run the example program, and you should see a window pop up with a green triangle.

Line by Line Example

To give you the idea of how to use the library, we will point outthe important parts of example.c in detail. Then, belowyou can read about how the individual functions work.

Begin by including gfx.h, to make the library available to the program. Note that quotes rather than angle brackets are used in this statement. Quotes indicate the header file is in the current directory, rather than in some system-defined place.

To open a graphics window, call gfx_open once at the beginning of the program, giving the width and height of the window in pixels, and the title of the window on the screen:gfx_color sets the current drawing color to a pale green:Now, use the gfx_line function to draw a line from (100,100) to (200,100):Wait for the user to press a key (or button):If the key is the letter 'q', break out of the loop:That shows you enough to get started.There are a few more useful functions in the library,read the following section to see them all.

Function Reference

gfx_open creates a new graphics window on the screen.width is the width of the window in pixels.height is the height of the window in pixels.title is the name of the window in the title bar.gfx_line draws a line in the graphics window, using thecurrent color, from location x1,y1 to x2,y2gfx_color sets the current color for drawing, using the RGB color model, in which you mix red, green, and blue components in order to get the desired color. gfx_color takes three integers between 0 and 255, each representing red, green, and blue. The following are some example colors:

Red	Green	Blue	Color Name
255	0	0	Red
0	255	0	Green
0	0	255	Blue
255	255	0	Yellow
255	255	255	White
100	100	100	Gray
0	0	0	Black

gfx_clear clears the window to the current background color,which is black by default.gfx_clear_color changes the background color, usingthe same format as gfx_clear above. The new backgroundcolor takes effect the next time gfx_clear is called.gfx_wait waits until the user presses a key or mouse button.If the user has pressed a mouse button, the integer 1, 2, or 3 will be returned,indicating the button pressed. If the user has pressed a key, that characterwill be returned. To determine the mouse location at that time, call gfx_xpos and gfx_ypos.gfx_xpos() and gfx_ypos return the X and Y coordinates, respectively, of the mouse pointerwhen the last key or button was pressed.gfx_wait causes the program to wait until something is pressed,which can be inconvenient in a real-time program. To avoid this, callgfx_event_waiting, which returns true if an event (key or button press)has occurred, otherwise returns false immediately. If it returns true, thenyou can call gfx_wait to retrieve the event without waiting.gfx_flush flushes all output to the graphics window.This forces all previous drawing commands to take effect.Output is normally flushed after a called to gfx_wait.If your program does not call gfx_wait then you needto call gfx_flush after drawing to the screen.