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added zoom + dragging support

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This commit is contained in:
Thomas von Dein
2024-05-22 19:48:37 +02:00
parent a5f4657d18
commit 3f0b4df8ff
2 changed files with 56 additions and 32 deletions
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77
main.go
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@@ -42,16 +42,18 @@ type Game struct {
ScreenWidth, ScreenHeight int
Generations int // Stats
Black, White, Grey, Beige color.RGBA
TPG int // ticks per generation/game speed, 1==max
TicksElapsed int // tick counter for game speed
Debug, Paused, Empty, Invert bool // game modi
ShowEvolution, NoGrid, RunOneStep bool // flags
Rule *Rule // which rule to use, default: B3/S23
Tiles Images // pre-computed tiles for dead and alife cells
RLE *rle.RLE // loaded GOL pattern from RLE file
Camera Camera
World *ebiten.Image
WheelTurned bool
TPG int // ticks per generation/game speed, 1==max
TicksElapsed int // tick counter for game speed
Debug, Paused, Empty, Invert bool // game modi
ShowEvolution, NoGrid, RunOneStep bool // flags
Rule *Rule // which rule to use, default: B3/S23
Tiles Images // pre-computed tiles for dead and alife cells
RLE *rle.RLE // loaded GOL pattern from RLE file
Camera Camera // for zoom+move
World *ebiten.Image // actual image we render to
WheelTurned bool // when user turns wheel multiple times, zoom faster
Dragging bool // middle mouse is pressed, move canvas
LastCursorPos []int
}
func (game *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
@@ -216,36 +218,55 @@ func (game *Game) CheckInput() {
game.RunOneStep = true
}
}
}
// Pane
if ebiten.IsKeyPressed(ebiten.KeyA) || ebiten.IsKeyPressed(ebiten.KeyArrowLeft) {
// Check dragging input. move the canvas with the mouse while pressing
// the middle mouse button, zoom in and out using the wheel.
func (game *Game) CheckDraggingInput() {
// move canvas
if game.Dragging && !ebiten.IsMouseButtonPressed(ebiten.MouseButton1) {
// release
game.Dragging = false
}
if !game.Dragging && ebiten.IsMouseButtonPressed(ebiten.MouseButton1) {
// start dragging
game.Dragging = true
game.LastCursorPos[0], game.LastCursorPos[1] = ebiten.CursorPosition()
}
if game.Dragging {
x, y := ebiten.CursorPosition()
if x != game.LastCursorPos[0] || y != game.LastCursorPos[1] {
// actually drag by mouse cursor pos diff to last cursor pos
game.Camera.Position[0] -= float64(x - game.LastCursorPos[0])
game.Camera.Position[1] -= float64(y - game.LastCursorPos[1])
}
game.LastCursorPos[0], game.LastCursorPos[1] = ebiten.CursorPosition()
}
// also support the arrow keys to move the canvas
if ebiten.IsKeyPressed(ebiten.KeyArrowLeft) {
game.Camera.Position[0] -= 1
}
if ebiten.IsKeyPressed(ebiten.KeyD) || ebiten.IsKeyPressed(ebiten.KeyArrowRight) {
if ebiten.IsKeyPressed(ebiten.KeyArrowRight) {
game.Camera.Position[0] += 1
}
if ebiten.IsKeyPressed(ebiten.KeyW) || ebiten.IsKeyPressed(ebiten.KeyArrowUp) {
if ebiten.IsKeyPressed(ebiten.KeyArrowUp) {
game.Camera.Position[1] -= 1
}
if ebiten.IsKeyPressed(ebiten.KeyS) || ebiten.IsKeyPressed(ebiten.KeyArrowDown) {
if ebiten.IsKeyPressed(ebiten.KeyArrowDown) {
game.Camera.Position[1] += 1
}
// Zoom
_, dy := ebiten.Wheel()
if ebiten.IsKeyPressed(ebiten.KeyO) {
if game.Camera.ZoomFactor > -2400 {
game.Camera.ZoomFactor -= 1
}
}
if ebiten.IsKeyPressed(ebiten.KeyI) {
if game.Camera.ZoomFactor < 2400 {
game.Camera.ZoomFactor += 1
}
}
step := 1
if game.WheelTurned {
// if keep scrolling the wheel, zoom faster
step = 50
} else {
game.WheelTurned = false
@@ -271,6 +292,7 @@ func (game *Game) CheckInput() {
func (game *Game) Update() error {
game.CheckInput()
game.CheckDraggingInput()
if !game.Paused || game.RunOneStep {
game.UpdateCells()
@@ -421,7 +443,6 @@ func (game *Game) InitTiles() {
if game.Invert {
game.White = color.RGBA{0, 0, 0, 0xff}
game.Black = color.RGBA{200, 200, 200, 0xff}
//game.Beige = color.RGBA{0x8b, 0x1a, 0x1a, 0xff}
game.Beige = color.RGBA{0x30, 0x1c, 0x11, 0xff}
}
@@ -455,6 +476,8 @@ func (game *Game) Init() {
game.Index = 0
game.TicksElapsed = 0
game.LastCursorPos = make([]int, 2)
}
// count the living neighbors of a cell