New class MapDisplay implements displaying maps to terminal. See #1

dungeonbattle/mapdisplay.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+import curses
+from dungeonbattle.interfaces import Map
+
+class MapDisplay:
+
+    def __init__(self, m: Map):
+        self.map = m
+        self.pad = curses.newpad(m.height, m.width)
+
+    def update_pad(self):
+        for i in range(self.map.height):
+            self.pad.addstr(i, 0, self.map.tiles[i][:-1])
+        for e in self.map.entities:
+            self.pad.addch(e.y, e.x, e.img)
+
+    def display(self, y, x):
+        self.pad.clear()
+        deltay, deltax = (curses.LINES // 2) + 1, (curses.COLS //2) + 1
+        pminrow, pmincol = y-deltay, x-deltax
+        sminrow, smincol = max(-pminrow, 0), max(-pmincol, 0)
+        deltay, deltax = curses.LINES - deltay, curses.COLS - deltay
+        smaxrow = self.map.height - (y + deltay) + curses.LINES
+        smaxrow = min(smaxrow, curses.LINES-1)
+        smaxcol = self.width - (x + deltax) + curses.COLS
+        smaxcol = min(smaxcol, curses.COLS-1)
+        pminrow = max(0, min(self.map.height, pminrow)) 
+        pmincol = max(0, min(self.map.width, pmincol))
+        self.update_pad()
+        self.pad.refresh(pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol)