Write an algorithm to draw a line in computer graphics

Once the major axis is found we sample the major axis at unit intervals and find the value in the other axis by using the slope equation of the line. Regardless, the plotting is the same. After moving some distance forward, you rise upwards and continue this sequence in discrete steps.

Let us say we have two endpoints xa,ya and xb,yb.

Similar algorithms[ edit ] The Bresenham algorithm can be interpreted as slightly modified digital differential analyzer using 0.

Here we will calculate y2-y1 and x2-x1 to find which one is greater. So here we need to sample the x axis at unit intervals i.

This can be done using the formulae: Basic algorithms rasterize lines in one color. So then, how do we represent the continuous object on this discrete matrix. Suppose at step i we have calculated xi, yi to be a point on the line. We have the slope equation as? View a machine-translated version of the German article.

On continuous media, by contrast, no algorithm is necessary to draw a line. Ok, so lets get down to some mathematics. Had there been no problems why would you be reading this?

The voxel heightmap software-rendering engines seen in some PC games also used this principle. Exact name of German article]]; see its history for attribution.

Therefore we sample x axis at unit intervals and find the y values corresponding to each x value. A line can be represented by the equation: After all, most of us ignore geometry in school. The same approach has been used for drawing a line on the screen.

If possible, verify the text with references provided in the foreign-language article. Enough of this introduction work.

I also realized that behind hardcore graphics were involved some very basic concepts that we used to blindly ignore in our school days. Lets say, the endpoints provided to us are not integers but fractions!

Bresenham also published a Run-Slice as opposed to the Run-Length computational algorithm. To my amazement I realized, that after all graphics was not such a tough cake. A line drawing algorithm is a graphical algorithm for approximating a line segment on discrete graphical media.

By writing this article, I myself am ensuring that I have got a good grasp on the algorithm. The Cartesian slope-intercept equation for a straight line is Y. I bought a book on graphics algorithms and set off to work. The result is this article. Content in this edit is translated from the existing German Wikipedia article at [[: The only thing we are left with now, is the actual calculations.

After grasping the fundamentals behind simple line drawing, I thought why not share the knowledge with the world. For more guidance, see Wikipedia: However, the computer monitor screen consists of a matrix of pixels.

On discrete media, such as pixel -based displays and printersline drawing requires such an approximation in nontrivial cases. The plotting can be viewed by plotting at the intersection of lines blue circles or filling in pixel boxes yellow squares.

What we require is to draw a line on the screen when we have been provided with the endpoints. The characteristic of the DDA algorithm is to take unit steps along one coordinate and compute the corresponding values along the other coordinate.

What we have to do is to draw a line segment that has the two given points as its endpoints.The DDA algorithm is faster than the direct use of the line equation since it calculates points on the line without any floating point multiplication.

Advantages of DDA Algorithm. 1. It is the simplest algorithm and it does not require special skills for implementation. 2. This algorithm is used in computer graphics for drawing line.

Here you will get program for bresenham's line drawing algorithm in C and C++. This algorithm is used in computer graphics for drawing line. Compiler settings – Linker settings, into write window (Other linker settings) (type it strictly as it is here: lbbgi-lgdilcomdlg line() is a library function of graphics.c in c programming language which is used to draw a line from two coordinates.

For example if you want to draw a line from point(x1,y1) to point(x2,y2) you have to use line() function like line(x1,y1,x2,y2). A line drawing algorithm is a graphical algorithm for approximating a line segment on discrete graphical media.

On continuous media, by contrast, no algorithm is necessary to draw a line. For example, oscilloscopes use natural phenomena to draw lines and curves. Fundamentals of Computer Graphics, 2nd Edition, A.K. Peters by Peter. Jul 17,  · After grasping the fundamentals behind simple line drawing, I thought why not share the knowledge with the world.

The result is this article. By writing this article, I myself am ensuring that I have got a good grasp on the algorithm. OK! Enough of this introduction work. Let's get down to some work. What we require is to draw a line on 5/5(1). In Computer Graphics the first basic line drawing algorithm is Digital Differential Analyzer (DDA) Algorithm.

Here you will learn about dda line drawing algorithm in C and C++. In Computer Graphics the first basic line drawing algorithm is Digital Differential Analyzer (DDA) Algorithm. It is a basic element in graphics.

To draw a line.

Write an algorithm to draw a line in computer graphics
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