Merge pull request #37 from jdoleary/sprite_anim2

add example "sprite_anim"

build.zig

@@ -50,11 +50,16 @@ pub fn build(b: *Builder) void {
             .path = "examples/core/2d_camera.zig",
             .desc = "Shows the functionality of a 2D camera",
         },
+        .{
+            .name = "sprite_anim",
+            .path = "examples/textures/sprite_anim.zig",
+            .desc = "Animate a sprite",
+        },
         .{
             .name = "texture_outline",
             .path = "examples/shaders/texture_outline.zig",
             .desc = "Uses a shader to create an outline around a sprite",
-        },
+        }
         // .{
         //     .name = "models_loading",
         //     .path = "examples/models/models_loading.zig",

examples/textures/sprite_anim.zig

@@ -0,0 +1,91 @@
+// Port of https://github.com/raysan5/raylib/blob/master/examples/textures/textures_sprite_anim.c to zig
+
+const std = @import("std");
+const rl = @import("raylib");
+
+const MAX_FRAME_SPEED = 15;
+const MIN_FRAME_SPEED = 1;
+
+pub fn main() anyerror!void {
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const screenWidth = 800;
+    const screenHeight = 450;
+
+    rl.InitAudioDevice();      // Initialize audio device
+    rl.InitWindow(screenWidth, screenHeight, "raylib [texture] example - sprite anim");
+
+    // NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+    const scarfy: rl.Texture2D = rl.LoadTexture("resources/textures/scarfy.png");  // Texture loading
+
+    const position = rl.Vector2{ .x = 350.0, .y = 280.0 };
+    var frameRec = rl.Rectangle{ .x = 0.0, .y = 0.0, .width = @intToFloat(f32, @divFloor(scarfy.width,6)), .height = @intToFloat(f32, scarfy.height) };
+    var currentFrame:u8 = 0;
+
+    var framesCounter:u8 = 0;
+    var framesSpeed:u8 = 8;            // Number of spritesheet frames shown by second
+
+    rl.SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!rl.WindowShouldClose())   // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        framesCounter += 1;
+
+        if (framesCounter >= (60/framesSpeed))
+        {
+            framesCounter = 0;
+            currentFrame += 1;
+
+            if (currentFrame > 5) currentFrame = 0;
+
+            frameRec.x = @intToFloat(f32,currentFrame)*@intToFloat(f32,@divFloor(scarfy.width,6));
+        }
+
+        // Control frames speed
+        if (rl.IsKeyPressed(rl.KeyboardKey.KEY_RIGHT)) {framesSpeed+=1;}
+        else if (rl.IsKeyPressed(rl.KeyboardKey.KEY_LEFT)) {framesSpeed-=1;}
+
+        if (framesSpeed > MAX_FRAME_SPEED) {framesSpeed = MAX_FRAME_SPEED;}
+        else if (framesSpeed < MIN_FRAME_SPEED) {framesSpeed = MIN_FRAME_SPEED;}
+
+
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        rl.BeginDrawing();
+
+            rl.ClearBackground(rl.RAYWHITE);
+
+            rl.DrawTexture(scarfy, 15, 40, rl.WHITE);
+            rl.DrawRectangleLines(15, 40, scarfy.width, scarfy.height, rl.LIME);
+            rl.DrawRectangleLines(15 + @floatToInt(i32,frameRec.x), 40 + @floatToInt(i32, frameRec.y), @floatToInt(i32,frameRec.width), @floatToInt(i32,frameRec.height), rl.RED);
+
+            rl.DrawText("FRAME SPEED: ", 165, 210, 10, rl.DARKGRAY);
+            rl.DrawText(rl.TextFormat("%02i FPS", framesSpeed), 575, 210, 10, rl.DARKGRAY);
+            rl.DrawText("PRESS RIGHT/LEFT KEYS to CHANGE SPEED!", 290, 240, 10, rl.DARKGRAY);
+
+            for ([_]u32{0} ** MAX_FRAME_SPEED) |_, i| {
+                if (i < framesSpeed) {rl.DrawRectangle(250 + 21*@intCast(c_int, i), 205, 20, 20, rl.RED);}
+                rl.DrawRectangleLines(250 + 21*@intCast(c_int, i), 205, 20, 20, rl.MAROON);
+            }
+
+            rl.DrawTextureRec(scarfy, frameRec, position, rl.WHITE);  // Draw part of the texture
+
+            rl.DrawText("(c) Scarfy sprite by Eiden Marsal", screenWidth - 200, screenHeight - 20, 10, rl.GRAY);
+
+        rl.EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    rl.UnloadTexture(scarfy);       // Texture unloading
+
+    rl.CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+}