Trying to make a python map editor

Question

The program is supposed to read the pixel color values from an image, and use that data as a map for where to place objects in a game world.

Getting the color values was easy enough:

import numpy
from PIL import Image

img = Image.open("colors.png")
data = numpy.array(img)

The color value should be used to choose a type of object, and the data[ ] index values translated as coordinates to choose where on a surface the object is placed. It's not clear to me how to go about implementing this, I'm still trying to learn python.

I need help with understanding how to structure a system which goes through all the values of the data[ ] array, and creates a map based off of those values. For example, data[0,0] is a red pixel, therefore make an instance of object_type_1 and place it in the top left corner of the screen surface, data[0,1] is a blue pixel, make an instance of object_type_2 and place it 20 pixels to the right of the first object.

Answer 1

The general process here is simply something like this:

for row_number in rows:
  for column_number in columns:
    value = data[column,row]
    if value == 1:
      obj = ObjectType1()
    elif value == 2:
      obj = ObjectType2()
    else value == 3:
      obj = ObjectType3()
    obj.x_position = column * 20
    obj.y_position = row * 20

I have assumed objects are 20 units in width because your question implied it.

This gives the objects a position, but it does not place them on the screen - how to draw objects depends on the graphics library you choose to use. But the process there will look a bit like this:

for object in all_objects:
    screen.draw(object.graphic, object.position_x, object.position_y)