Introduction: Parabola Plotting Web Pages

About: Have 30+ years of experiences as a Mixed Signal IC Design Engineer.
Graphics have become more available on web pages. A web page that can design parabolas can show what is now available. 

Step 1:

 Different applications require parabolas having different focal points. A parabola follows the following equation.

Y = X^2/(4*focal)

The old camera flash bulbs appeared to use a short focal length when compared to its radius. When the focal is 0.25, then Y will be unity when X is unity.

The web page to do this is only a text file. Feel free to save it as source on you computer. 

Step 2:

 Solar application may need a long focal length. If the focal is 1, then Y will be 0.25 when X is one. The radius of the parabola can be thought of as being X. The depth of the parabola can be thought of as being Y. 

Step 3:

 Some applications may require the focal point to be close to one half the depth. Using a focal which is at sqrt(1/8) will do the job. 

Step 4:

 The new graphing feature can be extended such that a web page can print out the segments of a parabola. The web page that does this is only a text file. Select a focal and whether to plot segments or the sides. Feel free to save  this page on your computer. Look at the page's text. 

Step 5:

 The parabola is design to step X from 0 to 1 in 0.1 units. The side view plots both the X steps and the corresponding Y steps as lines. This web page should be printable on a single sheet of page. Or it can be saved as a pdf file to be printed later. 

Step 6:

 Half of a parabola can be constructed by printing out  six segments and a left and right side. 

Step 7:

 The lines on the half parabola show how well all the X and Y dimension line up. 

 The plots are 700x700 bitmaps which avoid the auto scaling features found in most plotting resources. The plot will define a segment shape from a input  a focal length which is relative to the parabola's radius. By importing these plots into a graphic application for scaling, it should be possible to construct any type of parabola desired.