Added falling (& jumping) animation for lion.

Added some grass tiles.

src/assets/levels/level1.txt

@@ -14,8 +14,8 @@ x
 x                                                                                                 x
 x                                                                                                 x
 xxxxxxxxxx                                                                                        x
-x    SSSS                                                                                         x
-x         SSSSS                                                                                   x
+x                                                                                                 x
+x         S S S                                                                                   x
 x     P                       S S                  S S                                            x
 xxxxxxxxxxxxxxxxxxxxxxxxx    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                                                                                                    

src/context.zig

@@ -9,6 +9,8 @@ const Renderer = @import("renderer.zig").Renderer;
 pub const Context = struct {
     const DefaultDisplayWidth = 960;
     const DefaultDisplayHeight = 540;
+    // const DefaultDisplayWidth = 480;
+    // const DefaultDisplayHeight = 270;
 
     allocator: std.mem.Allocator,
     palette: Palette = undefined,

src/engine/point_f.zig

@@ -6,7 +6,7 @@ pub const PointF = struct {
     x: f32,
     y: f32,
 
-    pub const Zero = Point{ .x = 0, .y = 0 };
+    pub const Zero = PointF{ .x = 0, .y = 0 };
 
     pub fn init(x: f32, y: f32) PointF {
         return PointF{ .x = x, .y = y };

src/game/game.zig

@@ -20,10 +20,11 @@ pub const Game = struct {
     health: i64 = 4,
 
     playerPosition: engine.PointF,
+    playerFallingAnimation: Animation,
     playerIdleAnimation: Animation,
     playerWalkingAnimation: Animation,
     playerDirection: Direction,
-    isPlayerWalking: bool,
+    playerVelocity: engine.PointF,
 
     starAnimation: Animation,
 
@@ -37,10 +38,11 @@ pub const Game = struct {
         return Game{
             .level = level,
             .playerPosition = playerPosition,
+            .playerFallingAnimation = Animation.initPartialLoop(renderer.sprites.get("character_lion_48").?, 0.2, 8, 12),
             .playerIdleAnimation = Animation.initPartialLoop(renderer.sprites.get("character_lion_48").?, 0.25, 0, 4),
             .playerWalkingAnimation = Animation.initPartialLoop(renderer.sprites.get("character_lion_48").?, 0.125, 4, 8),
             .playerDirection = Direction.Right,
-            .isPlayerWalking = false,
+            .playerVelocity = engine.PointF.Zero,
             .starAnimation = Animation.init(renderer.sprites.get("item_star_32").?, 0.15),
             .renderer = renderer,
             .randomTile = TileMap(usize).init(allocator),
@@ -79,14 +81,49 @@ pub const Game = struct {
         renderer.textures.get("opaque").?.drawTintedScaled(allegro.mapRgba(127, 127, 127, 127), topLeftScreen.x, topLeftScreen.y, tileSizeScreen, tileSizeScreen);
     }
 
-    pub fn moveCharacter(self: *Game, distance: f32) void {
-        self.playerPosition.x += distance;
-        self.isPlayerWalking = true;
-        self.playerDirection = if (distance > 0) Direction.Right else Direction.Left;
+    pub fn movePlayer(self: *Game, dt: f32) void {
+        const to = self.playerPosition.add(self.playerVelocity.multiply(dt));
+        self.playerPosition = to;
+        if (self.playerVelocity.y > 0 and self.playerIsOnTile()) {
+            self.playerPosition.y = std.math.floor(self.playerPosition.y);
+            self.playerVelocity.y = 0;
+        } else if (self.playerVelocity.y < 0 and self.playerIsUnderTile()) {
+            self.playerPosition.y = std.math.ceil(self.playerPosition.y);
+            self.playerVelocity.y = -self.playerVelocity.y;
+        }
+        if (self.playerVelocity.x != 0) {
+            const playerTileTop = @floatToInt(i64, std.math.floor(self.playerPosition.y));
+            const playerTileBottom = @floatToInt(i64, std.math.floor(self.playerPosition.y + 0.99));
+            if (self.playerVelocity.x < 0) {
+                const playerTileLeft = @floatToInt(i64, std.math.ceil(self.playerPosition.x)) - 1;
+                if (self.level.tiles.get(playerTileLeft, playerTileTop) != null or self.level.tiles.get(playerTileLeft, playerTileBottom) != null) {
+                    self.playerPosition.x = std.math.ceil(self.playerPosition.x);
+                    self.playerVelocity.x = 0;
+                }
+            }
+            // const playerTileRight = @floatToInt(i64, std.math.floor(self.playerPosition.x)) + 1;
+        }
+        self.playerDirection = if (self.playerVelocity.x == 0) self.playerDirection else if (self.playerVelocity.x > 0) Direction.Right else Direction.Left;
 
         self.boundsInTiles = Game.calculateBoundsInTiles(self.playerPosition);
     }
 
+    pub fn playerIsOnTile(self: Game) bool {
+        const playerTileHeight = @floatToInt(i64, std.math.floor(self.playerPosition.y)) + 1;
+        const playerTileLeft = @floatToInt(i64, std.math.floor(self.playerPosition.x + 0.5));
+        const playerTileRight = @floatToInt(i64, std.math.ceil(self.playerPosition.x - 0.5));
+
+        return self.level.tiles.get(playerTileLeft, playerTileHeight) != null or self.level.tiles.get(playerTileRight, playerTileHeight) != null;
+    }
+
+    pub fn playerIsUnderTile(self: Game) bool {
+        const playerTileHeight = @floatToInt(i64, std.math.ceil(self.playerPosition.y)) - 1;
+        const playerTileLeft = @floatToInt(i64, std.math.floor(self.playerPosition.x + 0.5));
+        const playerTileRight = @floatToInt(i64, std.math.ceil(self.playerPosition.x - 0.5));
+
+        return self.level.tiles.get(playerTileLeft, playerTileHeight) != null or self.level.tiles.get(playerTileRight, playerTileHeight) != null;
+    }
+
     pub fn randomTileOffset(self: *Game, x: i64, y: i64, maxOffset: usize) usize {
         if (self.randomTile.get(x, y)) |offset| {
             return offset;
@@ -134,7 +171,8 @@ pub const Game = struct {
     }
 
     pub fn tick(self: *Game, t: f32, dt: f32) void {
+        _ = t;
+        _ = self;
         _ = dt;
-        self.playerAnimation.tick(t);
     }
 };

src/game_scene.zig

@@ -26,21 +26,46 @@ pub const GameScene = struct {
     }
 
     pub fn tick(self: *GameScene, ctx: *Context, t: f32, dt: f32) void {
-        const speed: f32 = 6; // tiles/s
+        const horizontalWalkAcceleration: f32 = 13;
+        const gravity: f32 = 71;
+        const jumpVelocity: f32 = -26;
+        const maxFallVelocity: f32 = 23;
+        const maxHorizontalWalkVelocity: f32 = 7; // tiles/s
 
         if (ctx.keys.isKeyPressed(allegro.c.ALLEGRO_KEY_LEFT)) {
-            self.game.moveCharacter(-speed * dt);
-            self.game.playerWalkingAnimation.tick(t);
+            self.game.playerVelocity.x = std.math.max(-maxHorizontalWalkVelocity, self.game.playerVelocity.x - horizontalWalkAcceleration);
         } else if (ctx.keys.isKeyPressed(allegro.c.ALLEGRO_KEY_RIGHT)) {
-            self.game.moveCharacter(speed * dt);
-            self.game.playerWalkingAnimation.tick(t);
+            self.game.playerVelocity.x = std.math.min(maxHorizontalWalkVelocity, self.game.playerVelocity.x + horizontalWalkAcceleration);
         } else {
-            if (self.game.isPlayerWalking) {
-                self.game.playerWalkingAnimation.reset();
+            if (std.math.fabs(self.game.playerVelocity.x) > 0.2) {
+                self.game.playerVelocity.x = self.game.playerVelocity.x - std.math.sign(self.game.playerVelocity.x) * horizontalWalkAcceleration * dt;
+            } else {
+                self.game.playerVelocity.x = 0;
             }
-            self.game.isPlayerWalking = false;
-            self.game.playerIdleAnimation.tick(t);
         }
+
+        if (self.game.playerVelocity.y == 0 and ctx.keys.isKeyPressed(allegro.c.ALLEGRO_KEY_SPACE)) {
+            self.game.playerVelocity.y = jumpVelocity;
+        } else if (!self.game.playerIsOnTile()) {
+            self.game.playerVelocity.y = std.math.min(maxFallVelocity, self.game.playerVelocity.y + gravity * dt);
+        }
+
+        // self.game.playerVelocity.y = std.math.min(maxFallVelocity, self.game.playerVelocity.y + self.game.playerAcceleration.y * dt);
+        if (self.game.playerVelocity.y != 0) {
+            self.game.playerFallingAnimation.tick(t);
+            self.game.playerIdleAnimation.reset();
+            self.game.playerWalkingAnimation.reset();
+        } else if (self.game.playerVelocity.x != 0 and self.game.playerVelocity.y == 0) {
+            self.game.playerWalkingAnimation.tick(t);
+            self.game.playerFallingAnimation.tick(t);
+            self.game.playerIdleAnimation.reset();
+        } else if (self.game.playerVelocity.x == 0) {
+            self.game.playerIdleAnimation.tick(t);
+            self.game.playerFallingAnimation.tick(t);
+            self.game.playerWalkingAnimation.reset();
+        }
+        self.game.movePlayer(dt);
+
         self.game.starAnimation.tick(t);
     }
 
@@ -82,10 +107,14 @@ pub const GameScene = struct {
                                 1 => {
                                     if (ordinals.right) offset = 0;
                                     if (ordinals.left) offset = 3;
+                                    if (ordinals.top) offset = 15;
+                                    if (ordinals.bottom) offset = 14;
                                 },
                                 2 => {
                                     if (ordinals.right and ordinals.left) offset = 1 + self.game.randomTileOffset(x, y, 2);
                                     if (ordinals.top and ordinals.bottom) offset = 12;
+                                    if (ordinals.top and ordinals.left) offset = 9;
+                                    if (ordinals.top and ordinals.right) offset = 8;
                                     if (ordinals.right and ordinals.bottom) offset = 4;
                                     if (ordinals.left and ordinals.bottom) offset = 5;
                                 },
@@ -112,15 +141,17 @@ pub const GameScene = struct {
             }
         }
 
-        const playerDirectionFrameOffset: usize = if (self.game.playerDirection == game.Game.Direction.Left) 0 else 8;
-        if (self.game.isPlayerWalking) {
+        const playerDirectionFrameOffset: usize = if (self.game.playerDirection == game.Game.Direction.Left) 0 else 12;
+        if (self.game.playerVelocity.y != 0) {
+            self.game.drawSpriteFrameP("character_lion_48", self.game.playerFallingAnimation.current + playerDirectionFrameOffset, self.game.playerPosition.add(engine.PointF.init(-0.25, -0.25)));
+        } else if (self.game.playerVelocity.x != 0 and self.game.playerVelocity.y == 0) {
             self.game.drawSpriteFrameP("character_lion_48", self.game.playerWalkingAnimation.current + playerDirectionFrameOffset, self.game.playerPosition.add(engine.PointF.init(-0.25, -0.25)));
         } else {
             self.game.drawSpriteFrameP("character_lion_48", self.game.playerIdleAnimation.current + playerDirectionFrameOffset, self.game.playerPosition.add(engine.PointF.init(-0.25, -0.25)));
         }
 
         if (ctx.showDebug) {
-            ctx.renderer.printTextV("debug", ctx.palette.background.text, 0.01, 0.1, Renderer.TextAlignment.Left, "Character: ({d}, {d})", .{ self.game.playerPosition.x, self.game.playerPosition.y });
+            ctx.renderer.printTextV("debug", ctx.palette.background.text, 0.01, 0.1, Renderer.TextAlignment.Left, "Character: ({d:.2}, {d:.2})", .{ self.game.playerPosition.x, self.game.playerPosition.y });
             ctx.renderer.printTextV("debug", ctx.palette.background.text, 0.01, 0.15, Renderer.TextAlignment.Left, "Tiles: ({d}, {d}) -> ({d}, {d})", .{ tileBounds.min.x, tileBounds.min.y, tileBounds.max.x, tileBounds.max.y });
             // self.game.debugHighlightTile(self.game.playerPosition);
         }