Draw a Letter

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IT 211 -- Project 4

Draw Two Letters

Goal: Draw two letters using "*" characters. Write your letter to an output file.
Look up your letter assignments here.
Relevant Examples: LetterH LetterZ French Flag LetterHPpm LetterZPpm
Restriction: when drawing letters, you must use double loops for which the action only prints one character (such as "*") at a time.
Important: Draw a hand sketch of your letter before you start writing any code.
Optional: If you wish, draw your letter in a .PBM or .PGM, or .PPM image file as with the French Flag Example. Sometimes the file extension .PNM (Portable Any Map) is used generically to indicate that any one of the three file formats PBM, PGM, or PPM is being used. If you expect to obtain an A in IT 211, your Project 3 Ruby script should produce a letter in a .PNM file.
1. For a .PBM (Portable Bit Map) file, each pixel consists of 0 or 1, depending on whether the image is black or white, respectively.
  The header in the first line of a PBM file is
```
P1 100 80
```
  where P1 is the magic number, 100 is the image width, and 80 is the image height. Here is a complete tiny image:
```
P1 3 3
0 1 0
1 1 0
0 0 1
```
2. For a .PGM (Portable Greylevel Map) file, each pixel is a number between 0 and 255 inclusive, which represents a gray level.
  The first line of the file is a header like this
```
P2 100 80 255 
```
  Where P2 is the magic number, 100 is the image width, 80 is the image height, and 255 is the maximum pixel value. Here is a complete tiny image:
```
P2 3 3 255
230 210  32
120  89   5
255 100   0
```
3. For a .PPM (Portable Pixel Map) file, each pixel contains the three color components red, green, and blue. Each component is a number between 0 and 255 inclusive, which represents a color pixel.
  The first line of the file is a header like this
```
P3 100 80 255 
```
  Where P3 is the magic number, 100 is the image width, 80 is the image height, and 255 is the maximum pixel value. Here is a complete tiny image:
```
P3 3 3 255
  0   0 128    0   0 128    0   0 128  
  0   0 128  196 196 196    0   0 128  
  0   0 128    0   0 128    0   0 128      
```

Free Image Viewers for PPM Images

Download IrfanView for Windows.
Download ToyViewer for Mac.

Grading Breakdown

Letter 1: 60 Letter 2: 25 Source Code Comments: 10 Properly Submitted: 5