fixed some performance things

geometry/grid.go

@@ -12,12 +12,12 @@ var defaultSquareSpacing = 5
 var minBorder = 20
 var ScoreOffset = 50
 var HighScoreOffset = 10
-var GameGrid Grid
+var GameGrid *Grid
 var MaxGridDimension = 20
 
 type Grid struct {
 	squareSpacing           int
-	squares                 [][]Square
+	squares                 [][]*Square
 	startX                  int
 	startY                  int
 	squareSize              int
@@ -77,14 +77,14 @@ func BuildGrid(numRows int, numColumns int) {
 	grd.startY = currentY
 	grd.squareSize = sqSize
 
-	table := make([][]Square, numRows)
+	table := make([][]*Square, numRows)
 
 	for i := 0; i < numRows; i++ {
-		row := make([]Square, numColumns)
+		row := make([]*Square, numColumns)
 		for j := 0; j < numColumns; j++ {
 			sq := MakeSquare(sqSize)
 			sq.SetPosition(currentX, currentY)
-			row[j] = sq
+			row[j] = &sq
 			currentX += sqSize + grd.squareSpacing
 		}
 		table[i] = row
@@ -133,7 +133,7 @@ func BuildGrid(numRows int, numColumns int) {
 	}
 	grd.coloredSquaresRemaining = squaresToColour
 
-	GameGrid = grd
+	GameGrid = &grd
 }
 
 func (grd *Grid) Draw(screen *ebiten.Image) {
@@ -174,7 +174,7 @@ func (grd *Grid) ChangeColour(row int, column int, clr color.Color) {
 }
 
 func (grd *Grid) GetSquareAt(row int, column int) *Square {
-	return &grd.squares[row-1][column-1]
+	return grd.squares[row-1][column-1]
 }
 
 func (grd *Grid) ColouredSquaresRemaining() int {