ij-macro-programming-workshop
Exercise 08.03 - for-loop
Aim:
- use a nested for-loop to iterate ofer the pixel of an image
Write a nested for-loop that iterates over the pixel of the image.
The outer for-loop will iterate over the x-coordinates and the inner
for-loop over the y-coordinates (or vice versa). Use the build-in
function setPixel(x,y,v) to set each pixel to the value x*y%255.
Create a new image with the title pattern, the type 8-bit,
the width 255, the height 255 and 1 slice:
newImage("pattern", "8-bit", 255, 255, 1);
Apply a lookup-table (mapping of gray-values to colors) to the image:
run("16 colors");
Get the width of the image:
width = getWidth();
Get the height of the image:
height = getHeight();
Your code starts after this line
for(x=0; x<width; x++) {
for(y=0; y<height; y++) {
setPixel(x, y, x*y % 255);
}
}
Your code ends before this line
The code below is for automatically checking the result. Please ignore it!
ok = (getPixel(2,3) == 6);
ok = (ok && (getPixel(10,20) == 200));
ok = (ok && (getPixel(12,12) == 144));
ok = (ok && (getPixel(200,201) == 165));
if (ok)
showMessage("That's right. Great, you did it!");
else
showMessage("Your result is wrong! Please check your macro and try again!");