##
## cursor.py
##
## Split Visionaries is (c)2006, Rikard Bosnjakovic <bos@hack.org>
##
## Last update: 2006-06-25
##
import pygame

class Cursor:
    def __init__(self, size, limit):
        # size in pixels
        self.size = size

        # max value for x/y-movement
        self.limit = (limit - 1, limit)

        # paint and store the cursor
        self.init_cursor()

        # initiate the cursor at the first board block
        self.pos_x = 0
        self.pos_y = 0
        self.pos   = (self.pos_x, self.pos_y)

    def init_cursor(self):
        # draw a cursor
        size = self.size
        self.surface = pygame.Surface((size, size))
        self.surface.set_alpha(150)
        self.surface.fill( (255, 255, 255) )
        self.surface = self.surface.convert_alpha()

        # make a hole in the middle
        x = y = int(size * 0.1)
        width = height = int(size - 2*x)
        _rect = (x, y, width, height)
        _RGBA = (0, 0, 0, 0)
        pygame.draw.rect(self.surface, _RGBA, _rect)

    def move(self, direction):
        # current pos
        _x, _y = self.pos
        # direction
        x, y   = direction

        # add delta to current position
        _x += x
        _y += y

        limit = self.limit
        if _x > limit[0]: _x = limit[0]
        if _x < 0:        _x = 0
        if _y > limit[1]: _y = limit[1]
        if _y < 0:        _y = 0
        
        self.pos = (_x, _y)