How to Do Draft Unit 1 Lab 3 Modern Art With Polygons Page 4

Alter Your Pinwheel

On this page, y'all volition change your existing pinwheel block so that y'all can apply information technology to draw a multifariousness of shapes.

Adding Multiple Inputs

Call up how y'all commencement generalized your original pinwheel script: you added an input called number of branches that controlled the turning bending of the sprite. By calculation more inputs, you can generalize other aspects of your program.

The procedure definition for the custom pinwheel command

would exist written as

PROCEDURE pinwheel(numberOfBranches) {     REPEAT numberOfBranches TIMES     {         motility(100)         move(-37)         turn_clockwise(360 / numberOfBranches)     } }

or

The procedures

move()

and

turn_clockwise()

aren't congenital in to the AP's language so they are written in lower case like other programmer-defined procedures.

Detect that the lid cake, , would exist written every bit

Procedure pinwheel(numberOfBranches)

. The word

PROCEDURE

tells yous that that line of the lawmaking is like a hat block; the variable name in the parentheses on that line is the input that the procedure takes.

Debugging Tip: Organizing Your Code

One mode to avoid having bugs in your program in the offset place is to go along your code organized by deleting any unused scripts. You tin utilize the clean up option by right-clicking (or control-clicking on a Mac) in the scripting surface area to organize your blocks. You can remove a block or script either past dragging it out of the scripting expanse and back to the palettes on the left or by choosing the "delete" option from the drop-downward menu. Click here for a video. (Annotation that this is different from the "delete block definition" choice which will permanently delete a custom block and all its instances from your entire project.)

8. Tidy up the lawmaking in your project, if necessary.

This instruction would exist written every bit

Pinwheel(6, 80, 20)

or .

You lot may hear people utilise the term "pseudocode" to refer to this pseudo-language used on the AP CS Principles exam, but it's not pseudocode. Pseudocode isn't a programming language at all, it's the apply of normal human language to describe an algorithm.

9. Notice inputs to pinwheel that make the issue wait like a circumvolve.

1. On the right is a painting past Vassily Kandinsky. The four pictures above were inspired by it, just the sizes and placement of the circles in the original were carefully chosen, whereas the ones above are random. Also, Kandinsky'southward solid circles aren't quite uniform in colour. For example, the greenish circle nigh the tiptop correct of the movie has a low-cal green outer edge, a somewhat darker dark-green within, a bluish-green inner edge, and black inside that.

   When two solid circles overlap, you can see both colors, or rather, a color in between the two. To achieve that effect in Snap!, before cartoon the second circle, utilise the block. A transparency of 0 means you see only the new color; a transparency of 100 means you meet only the old colour. In-between values determine which color is stronger in the overlapping area.

   Most of Kandinsky's circles are solid, but a few aren't. well-nigh notably the large white "halo" near the heart of the painting. His hollow circles don't accept a abiding width; if yous want yours to look like his, change the pen size a trivial as y'all're drawing. But of course y'all don't take to make your fine art look exactly like his, nor exactly similar the examples above. Utilise them for inspiration, simply you're the artist.
2. Make a moving picture that looks more like a real pinwheel:
   
   Copyright 2010 Victoria Hudgins. Used by permission.

   (Save your project first; yous'll demand the pinwheel block you already accept afterward.)

   It doesn't accept to expect exactly like the photo. But each arm of a pinwheel is essentially two triangles. You lot may find the block helpful.

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Source: https://bjc.berkeley.edu/bjc-r/cur/programming/1-introduction/3-drawing/4-modify-your-pinwheel.html

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