fix #7: use only left mouse button to draw, it toggles cell state

README.md

@@ -82,17 +82,16 @@ Usage of ./golsky:
 
 While it runs, there are a couple of commands you can use:
 
-* left mouse click: set a cell to alife (also pauses the game)
-* right mouse click: set a cell to dead
+
 * space: pause or resume the game
 * while game is paused: press n to forward one step
 * page up: speed up
 * page down: slow down
 * Mouse wheel: zoom in or out
 * move mouse while left mouse button pressed: move canvas
-* i: enter "insert" (draw) mode: use left mouse to set cells alife and right
-  button to dead. Leave with "space". While in insert mode, use middle mouse
-  button to drag grid.
+* i: enter "insert" (draw) mode: use left mouse to toggle cells alife state.
+  Leave with insert mode "space". While in insert mode, use middle mouse
+  button to drag the grid.
 * r: reset to 1:1 zoom
 * escape: open menu
 * s: save game state to file (can be loaded with -l)

src/config.go

@@ -52,7 +52,7 @@ const (
 	DEFAULT_CELLSIZE    = 4
 	DEFAULT_ZOOMFACTOR  = 400
 	DEFAULT_GEOM        = "640x384"
-	DEFAULT_THEME       = "standard" // "light" // inverse => "dark"
+	DEFAULT_THEME       = "standard"
 )
 
 const KEYBINDINGS string = `
@@ -62,9 +62,9 @@ const KEYBINDINGS string = `
 - PAGE DOWN: slow down
 - MOUSE WHEEL: zoom in or out
 - LEFT MOUSE BUTTON: use to drag canvas, keep clicked and move mouse
-- I: enter "insert" (draw) mode: use left mouse to set cells alife and right
-     button to dead. Leave with "space". While in insert mode, use middle mouse
-     button to drag grid.
+- I: enter "insert" (draw) mode: use left mouse to toggle a cells alife state.
+     Leave with insert mode with "space". While in insert mode, use middle mouse
+     button to drag the grid.
 - R: reset to 1:1 zoom
 - ESCAPE: open menu, o: open options menu
 - S: save game state to file (can be loaded with -l)

src/play.go

@@ -264,10 +264,8 @@ func (scene *ScenePlay) CheckInput() {
 func (scene *ScenePlay) CheckDrawingInput() {
 	if scene.Config.Drawmode {
 		switch {
-		case ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft):
-			scene.ToggleCellOnCursorPos(Alive)
-		case ebiten.IsMouseButtonPressed(ebiten.MouseButtonRight):
-			scene.ToggleCellOnCursorPos(Dead)
+		case inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft):
+			scene.ToggleCellOnCursorPos()
 		case inpututil.IsKeyJustPressed(ebiten.KeyEscape):
 			scene.Config.Drawmode = false
 		}
@@ -465,14 +463,14 @@ func (scene *ScenePlay) Update() error {
 }
 
 // set a cell to alive or dead
-func (scene *ScenePlay) ToggleCellOnCursorPos(alive uint8) {
+func (scene *ScenePlay) ToggleCellOnCursorPos() {
 	// use cursor pos relative to the world
 	worldX, worldY := scene.Camera.ScreenToWorld(ebiten.CursorPosition())
 	x := int(worldX) / scene.Config.Cellsize
 	y := int(worldY) / scene.Config.Cellsize
 
 	if x > -1 && y > -1 && x < scene.Config.Width && y < scene.Config.Height {
-		scene.Grids[scene.Index].Data[y][x].State = alive
+		scene.Grids[scene.Index].Data[y][x].State ^= 1
 		scene.History.Age[y][x] = 1
 	}
 }