Add function drawWall()

Main.go

@@ -117,6 +117,28 @@ func drawMonth(m time.Month, x, y int) {
 }
 
 func drawWall() {
+	w, h := wall.Size()
+	if w < monthWidth + 2 * smallGap || h < monthHeight + 2 * smallGap + titleHeight {
+		wrappedText("Екран је премали за календар.", wall, defStyle)
+		return
+	}
+	monthsWide := (w - 2*smallGap + largeGap) / (monthWidth + largeGap)
+	monthsHigh := (h - smallGap - titleHeight) / (monthHeight + smallGap)
+	monthsDrawn := min(monthsHigh*monthsWide, 12) // TODO: izraziti 12 drugacije??
+
+	startingMonth := time.Month((int(selTime.Month()) - 1) / monthsDrawn * monthsDrawn + 1)
+	endingMonth := time.Month(min(12, int(startingMonth) + monthsDrawn - 1))
+
+	centerVert := (w - monthsWide*monthWidth - (monthsWide-1)*largeGap) / 2
+	for i, m := 0, startingMonth ; i < monthsHigh ; i++ {
+		for j := 0 ; j < monthsWide ; j++ {
+			drawMonth(m, centerVert + j*(monthWidth+largeGap), titleHeight + smallGap + i*(monthHeight+smallGap))
+			if m >= endingMonth {
+				return
+			}
+			m++
+		}
+	}
 }
 
 func main() {
@@ -135,8 +157,7 @@ func main() {
 
 	wall.SetStyle(defStyle)
 	wall.Clear()
-	drawMonth(time.January, 0, 0)
-	drawMonth(time.July, monthWidth * 2, 0)
+	drawWall()
 
 
 	quit := func() {