Scratch

Project Notes

USE: Set the pixel size and maximum iteration count with the sliders, and hit the green flag go. -Big pixels make the picture blockier, but doubling the pixel size quadruples speed. -Fewer iterations give less detail toward the inside and (because of the color scaling) make more abrupt color changes. More iterations make a better picture but take much longer. HOW IT WORKS: -Image drawing: It draws rows of pixels by moving forward one brush-width with the pen down, then changing the color. After each row, it picks up the pen and returns to the start of the next row, one brush-width down. This takes two nested repeats. -Fractal: For each point, it initializes the complex numbers C and Z to the current point. It then repeatedly applies Z=Z^2+C until Z escapes from a circle of radius 2. Iteration count gives pixel color. This is the innermost repeat-until.