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COMPUTER GRAPHICS PROGRAMS IN C PDF

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Learning Modern 3D Graphics Programming .. B. History of PC Graphics Hardware. . You are expected to be able to read C and reasonable C++ code. Department of Computer Science. COMSATS IIT Abbottabad To start with graphics programming, Turbo C is a good choice. Even though DOS has its own . Griswold, Ralph E., Graphics programming in Icon / Ralph E. Griswold, Clinton personal computer words or terms in which proprietary rights might exist.

If pathtodriver is null. Basic Shapes and Colors: Now let us write a program to draw some basic shapes. It clears the screen also.

All the coordinates are mentioned with respect to top-left corner of the screen. If you have the BGI file in the same folder of your program. Number of pixels in the screen decides resolution of the screen.

In graphics mode. Integer that specifies the graphics driver to be used. If they're not there. BGI first. Otherwise DOS screen will not go to text mode after running the program. There is another function outtext that displayes a text in the current position. Current position is the place where last drawing is ended.

Parameters passed are x and y coordinates of the position on the screen where text is to be displayed. These functions are declared as follows: You can use different fonts. Function outtextxy displays a string in graphical mode. Not that. By looking at the output of the previous program.

Graphics Programming in C++

Center point of arc. Another basic shape that we come across is a rectangle. To use these functions.

Refer this figure for clear idea: For the details of current color. Start angle in degrees endangle: End angle in degrees radius: Radius of arc. To draw a border. After calling setfillstyle. Each pair of integers gives the x and y coordinates of a point on the polygon.

Let us study more about shapes latter. To draw a closed polygon with N points. There are 16 colors declared in graphics.. Points to a sequence of numpoints x 2 integers. You can either use color as defined above or number like setcolor 4.

Colors in C Graphics Programming

Here is some idea about colors. Setfillstyle sets fill pattern and fill colors. The parameter pattern in setfillstyle is as follows: Names Value Means Fill With. These function declarations are as follows. If we use setcolor RED. We have a function random no. The effect is by drawing random radius. We need your suggestions. Ranjith K. Tell us which part of the article need to be explained more.

Read Part II Tell us about this article: This is the first article of this tutorial. Next part of the article will be depending on the comments you post. To continue with. We are planning to expand it. Click here to post a feed back or e-mail me: We will study the difference between text mode and graphics mode in detail latter.

Integer that specifies the graphics driver to be used. You can give graphdriver a value using a constant of the graphics drivers enumeration type. It clears the screen also.

Writing Graphics Applications for Windows 98

A graphics program should have a closegraph function at the end of graphics. Otherwise DOS screen will not go to text mode after running the program. Here, closegraph is called after getch since screen should not clear until user hits a key. If you have the BGI file in the same folder of your program, you can just leave it as "" only.

In graphics mode, all the screen co-ordinates are mentioned in terms of pixels. Number of pixels in the screen decides resolution of the screen. All the coordinates are mentioned with respect to top-left corner of the screen. Here is the screenshot of output: Here, circle function takes x, y coordinates of the circle with respect to left top of the screen and radius of the circle in terms of pixels as arguments.

Not that, in graphics, almost all the screen parameters are measured in terms of pixels. Function outtextxy displays a string in graphical mode. You can use different fonts, text sizes, alignments, colors and directions of the text that we will study later. Parameters passed are x and y coordinates of the position on the screen where text is to be displayed.

There is another function outtext that displayes a text in the current position.

Current position is the place where last drawing is ended. These functions are declared as follows:. End angle in degrees. Refer this figure for clear idea: For the details of current color, fill color and fill patterns, refer the sections Lines and Colors.

Graphics programming in C

Another basic shape that we come across is a rectangle. To draw a border, use rectangle with the coordinates of outline, to draw a square use rectangle with same height and width. To use these functions, store coordinates of the shape in an array and pass the address of array as an argument to the function.

By looking at the output of the previous program, you can understand what drawpoly is. Specifies number of points. Points to a sequence of numpoints x 2 integers. Each pair of integers gives the x and y coordinates of a point on the polygon. Let us study more about shapes latter. Here is some idea about colors. There are 16 colors declared in graphics. To use these colors, use functions setcolor , setbkcolor and setfillstyle. If we use setcolor RED ; and draw any shape, line or text after that, the drawing will be in red color.

You can either use color as defined above or number like setcolor 4 ;. Setfillstyle sets fill pattern and fill colors. These function declarations are as follows.

functions of graphics.h

Names Value Means Fill With Here is an example program with colors, pixels, bar, cleardevice etc. We have a function random no , it returns a random number between 0 an no. The effect is by drawing random radius, random color circles with same center and random pixels. So, the loop will continue until a key is pressed.

In the next part of the article, Ranjith K. Read Part II. Tell us about this article: This is the first article of this tutorial. We are planning to expand it. To continue with, We need your suggestions. Tell us which part of the article need to be explained more, how can the article be elaborated more and how did you feel the article.

Click here to post a feed back or e-mail me: In GUI's like Windows, mouse is very important for user interaction. But in DOS, mouse will come in to picture only in some of the programs. If you are writing DOS games or graphics programs, you can add mouse functionality to your code.

Here is how to do that. If you are beginner to Turbo C graphics programming, read our introduction to Turbo C graphics.

Mouse can be used in text mode as well as in graphics mode. Usually it is used in graphics mode. Hence we must first change over to graphics mode. In our program the function initgraph is responsible for switching the mode from text to graphics.

It requests initgraph to automatically determine which graphics driver to load in order to switch to the highest resolution graphics mode.

The initgraph function takes three parameters, the graphics driver, the graphics mode and the path to the driver file. Once the driver has been loaded, initgraph sets up the numeric values of the graphics mode chosen in the variables gd and gm respectively. Here we are assuming that the driver files are in the directory 'c: Hence the path passed to initgraph is 'c: The various mouse functions can be accessed by setting up the AX register with different values service number and issuing interrupt number When this function is called in main it displays the mouse pointer.

The position of the pointer can be changed by using the mouse. When this function is called in main it hides the mouse pointer.

This function is useful while drawing figures, first the mouse pointer is kept hidden, then the figure is been drawn and again the mouse pointer is been called. This function returns the position of the mouse pointer. It contains three parameters,they are xpos,ypos,click.

Click is the integer variable which returns the values 1,2,3 corresponding to the button pressed on the mouse and 0 for buttons being not pressed. If any key is pressed kbhit returns nonzero integer; if not it returns zero. This function sets the mouse pointer to specific position. CX is been loaded by x co-ordinate of the mouse pointer and DX is been loaded with the y co-ordinate of the mouse pointer.

Its sets the horizontal barrier for the pointer which restricts the mouse pointer to pass that limit. CX is been loaded with the minimum x co-ordinate and Dx is been loaded with the maximum x co-ordinate. Its sets the vertical barrier for the pointer which restricts the mouse pointer to pass that limit. CX is been loaded with the minimum y co-ordinate and Dx is been loaded with the maximum y co- ordinate.A letter of verification for approved accommodations can be obtained from DSP.

Not that, in graphics, almost all the screen parameters are measured in terms of pixels. Refer this figure for clear idea: For the details of current color, fill color and fill patterns, refer the sections Lines and Colors. When this function is called in main it displays the mouse pointer.

BGI file from disk.

To start the graphics system, you must first call initgraph. It also resets or initializes all graphics settings like color, palette, current position etc, to their default values.

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