Can add blocks with mouse now

src/display.zig

@@ -0,0 +1,26 @@
+const rl = @import("raylib");
+
+// functions for drawing shapes from WS coordinates
+
+// RECTANGLES ===============
+pub inline fn DrawRectangleWS(posX: c_int, posY: c_int, width: c_int, height: c_int, color: rl.Color) void 
+    { rl.DrawRectangle(posX, -(posY + height), width, height, color); }
+
+pub inline fn DrawRectangleVWS(position: rl.Vector2, size: rl.Vector2, color: rl.Color) void
+    { rl.DrawRectangleV(.{ .x = position.x, .y = -(position.y + size.y) }, size, color); }
+
+pub inline fn DrawRectangleRecWS(rec: rl.Rectangle, color: rl.Color) void
+    { rl.DrawRectangleRec(.{ .x = rec.x, .y = -(rec.y + rec.height), .width = rec.width, .height = rec.height}, color); }
+
+
+// CIRCLES ===============
+pub inline fn DrawCircleVWS(center: rl.Vector2, radius: f32, color: rl.Color) void
+    { rl.DrawCircleV(.{ .x = center.x, .y = -center.y }, radius, color); }
+
+
+// TEXTURES ===============
+pub inline fn DrawTextureVWS(texture: rl.Texture2D, position: rl.Vector2, tint: rl.Color) void
+    { rl.DrawTextureV(texture, .{ .x = position.x, .y = -position.y}, tint); }
+
+pub inline fn DrawTextureRecWS(texture: rl.Texture2D, source: rl.Rectangle, position: rl.Vector2, tint: rl.Color) void
+    { rl.DrawTextureRec(texture, .{ .x = source.x, .y = -source.y, .width = source.width, .height = source.height }, .{ .x = position.x, .y = -position.y }, tint); }

src/main.zig

@@ -3,19 +3,21 @@ const rlm = @import("raylib-math");
 const std = @import("std");
 const obj = @import("types.zig");
 const phs = @import("physics.zig");
+const utils = @import("utils.zig");
+const disp = @import("display.zig");
 
 const DEBUG = true;
 
 // NOTE
-// Coordinate system starts at top left corner, whitch means THE Y AXIS IS FLIPPED!!!
+// Coordinate system starts at top left corner, whitch means THE Y AXIS IS FLIPPED!!! (for on screen coordinates)
 
 // MAIN
 pub fn main() anyerror!void
 {
     // MEMORY ALLOCATOR
     //--------------------------------------------------------------------------------------
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
-    var arenaAlloc = arena.allocator();
+    var gp_alloc = std.heap.GeneralPurposeAllocator(.{}){};
+    var allocator = gp_alloc.allocator();
 
     // Initialization
     //--------------------------------------------------------------------------------------
@@ -26,20 +28,15 @@ pub fn main() anyerror!void
     // rl.SetWindowState(rl.ConfigFlags.FLAG_WINDOW_RESIZABLE);
     defer rl.CloseWindow(); // Close window and OpenGL context
 
-    var camera = rl.Camera2D {
+    var ws_camera = rl.Camera2D {
         .target = rl.Vector2 { .x = 0, .y = 0 },
         .offset = rl.Vector2 { .x = screenWidth / 2, .y = screenHeight / 2 },
         .rotation = 0,
         .zoom = 1,
     };
 
-    // var map: obj.Map = obj.Map { .tiles = undefined };
-    // var objects = [_]obj.Object{
-    //     .{ .box = .{ .x = 0, .y = 0, .width = 300, .height = 20, },   .texture = null },
-    //     .{ .box = .{ .x = 100, .y = 0, .width = 20, .height = 200, }, .texture = null }
-    // };
 
-    var objects = std.ArrayList(obj.Object).init(arenaAlloc);
+    var objects = std.ArrayList(obj.Object).init(allocator);
     try objects.append(.{ .box = .{ .x = 0,   .y = 0, .width = 300, .height = 20,  }, .texture = null }); 
     try objects.append(.{ .box = .{ .x = 100, .y = 0, .width = 20,  .height = 200, }, .texture = null });
 
@@ -55,13 +52,15 @@ pub fn main() anyerror!void
     player.detection_box = .{ .x = &player.box.x, .y = &player.box.y, .width = 22, .height = 22 };
     
     var texture = rl.LoadTexture("./resources/log.png");
-    var playerTexture = rl.LoadTexture("./resources/cursor.png");
+    var player_texture = rl.LoadTexture("./resources/cursor.png");
 
     // freefly
     var fly = true;
 
     rl.SetTargetFPS(60); // Set our game to run at 60 frames-per-second
 
+    var mouse_ws_position: rl.Vector2 = undefined;
+    var mouse_ws_end_position: rl.Vector2 = undefined;
 
     // Main game loop ================================================================
     while (!rl.WindowShouldClose()) // Detect window close button or ESC key
@@ -83,62 +82,86 @@ pub fn main() anyerror!void
         phs.ApplyPlayerCollisions(&player, map);
 
         // camera setup
-        camera.target = rl.Vector2 { .x = player.box.x + player.box.width / 2, .y = -(player.box.y + player.box.height / 2) };
+        ws_camera.target = rl.Vector2 { .x = player.box.x + player.box.width / 2, .y = -(player.box.y + player.box.height / 2) };
         // input related to camera
-        camera.zoom += rl.GetMouseWheelMove() * 0.05 * camera.zoom;
+        ws_camera.zoom += rl.GetMouseWheelMove() * 0.05 * ws_camera.zoom;
 
 
         // DEBUG
         // try stdout.print("player position: x = {d}, y = {d}\n", .{player.box.x, player.box.y});
         // std.log.debug("player position: x = {d}, y = {d}, velocity: x = {d}, y = {d}", .{player.box.x, player.box.y, player.velocity.x, player.velocity.y});    
         // std.log.debug("{}", .{player.detection_box});
+        // std.debug.print("camera terget: x = {d}, y = {d}\n", .{camera.target.x, camera.target.y});
+        
+
+        // MOUSE SELECTION LOGIC =======
+        if (rl.IsMouseButtonPressed(.MOUSE_BUTTON_LEFT)) { mouse_ws_position     = utils.GetMousePositionWS(ws_camera, screenWidth, screenHeight); }
+        if (rl.IsMouseButtonDown(.MOUSE_BUTTON_LEFT))    { mouse_ws_end_position = utils.GetMousePositionWS(ws_camera, screenWidth, screenHeight); }
+
+        var rec_fixed = .{ .x = mouse_ws_position.x, .y = mouse_ws_position.y };
+        var rec_wh = .{ .x = @fabs(mouse_ws_position.x - mouse_ws_end_position.x), .y = @fabs(mouse_ws_position.y - mouse_ws_end_position.y)};
+        if (mouse_ws_end_position.x < mouse_ws_position.x) { rec_fixed.x = mouse_ws_end_position.x; }
+        if (mouse_ws_end_position.y < mouse_ws_position.y) { rec_fixed.y = mouse_ws_end_position.y; }
+
+        if (rl.IsMouseButtonReleased(.MOUSE_BUTTON_LEFT)) { try map.tiles.append( .{ .box = .{ .x = rec_fixed.x, .y = rec_fixed.y, .width = rec_wh.x, .height = rec_wh.y }, .texture = null } ); }
+
+
 
         {
             // init drawing
             rl.BeginDrawing();
+            defer rl.EndDrawing();
             
             // clear screen with WHITE
-            defer rl.ClearBackground(rl.RAYWHITE);
+            rl.ClearBackground(rl.RAYWHITE);
+            
 
             {
                 // init camera
-                camera.Begin();
-                defer camera.End();
+                ws_camera.Begin();
+                defer ws_camera.End();
 
-                defer rl.DrawCircleV( .{ .x = 0, .y = 0 } , 4, rl.BLUE);
+
+                defer disp.DrawCircleVWS( .{ .x = 0, .y = 0 }, 4, rl.BLUE);
 
                 // what have I done
                 rl.DrawTextureV(texture, .{ .x = -100, .y = -200}, rl.WHITE);
                     
+                disp.DrawCircleVWS( mouse_ws_position, 10, rl.RED);
+                disp.DrawCircleVWS( mouse_ws_end_position, 10, rl.BLUE);
 
-                // draw player
-                var playerRenderBox = .{ .x = player.box.x, .y = -player.box.y - player.box.height, .width = player.box.width, .height = player.box.height };
-                _ = playerRenderBox;
+                // for drawing region selected with mouse
+                disp.DrawRectangleVWS( rec_fixed, rec_wh, rl.BLUE );
+                
+
+
+                // draw player =====
+                // var playerRenderBox = .{ .x = player.box.x, .y = -player.box.y - player.box.height, .width = player.box.width, .height = player.box.height };
+                // _ = playerRenderBox;
                 // defer rl.DrawRectangleRec( playerRenderBox, rl.RED);
-                defer rl.DrawTextureV( playerTexture, .{ .x = player.box.x, .y = -player.box.y - player.box.height }, rl.WHITE);
+                defer disp.DrawTextureVWS( player_texture, .{ .x = player.box.x, .y = player.box.y + player.box.height}, rl.WHITE);
                 // rl.DrawRectangleRec(.{ .x = player.detection_box.x.* - 5 , .y = player.detection_box.y.* - 5, .width = player.detection_box.width, .height = player.detection_box.height }, rl.RED);
 
 
                 // tile drawing
-                for (map.tiles.allocatedSlice()) |tile| {
-                    var dispTile = .{ .x = tile.box.x, .y = tile.box.y - tile.box.height, .width = tile.box.width, .height = tile.box.height };
-                    rl.DrawRectangleRec(dispTile, rl.GRAY);
+                for (map.tiles.items) |tile| {
+                    disp.DrawRectangleRecWS(tile.box, rl.GRAY);
 
                     // DEBUG
                     if (DEBUG) {
                         // draw block midpoints
-                        var midpoint: rl.Vector2 = .{ .x = tile.box.x + (tile.box.width / 2), .y = -(tile.box.y + (tile.box.height / 2)) };
-                        rl.DrawCircleV( midpoint, 4, rl.GREEN);
+                        var midpoint: rl.Vector2 = .{ .x = tile.box.x + (tile.box.width / 2), .y = tile.box.y + (tile.box.height / 2) };
+                        disp.DrawCircleVWS( midpoint, 4, rl.GREEN);
 
                         // draw collision rectangles (with player)
                         var col_rec = rl.GetCollisionRec(player.box, tile.box);
-                        rl.DrawRectangleRec(col_rec, rl.BLUE);
+                        disp.DrawRectangleRecWS(col_rec, rl.BLUE);
 
                         // draw tile origin points
-                        rl.DrawCircleV( .{ .x = tile.box.x, .y = -tile.box.y }, 4, rl.ORANGE );
+                        disp.DrawCircleVWS( .{ .x = tile.box.x, .y = tile.box.y }, 4, rl.ORANGE );
 
-                        // draw collision rectangle (with player collision box)
-                        rl.DrawRectangleRec( rl.GetCollisionRec( .{ .x = player.detection_box.x.* - 1, .y = -player.detection_box.y.* - 1 - player.box.height, .width = player.detection_box.width, .height = player.detection_box.height}, dispTile ), rl.BLUE);
+                        // draw collision rectangle (with player detection box)
+                        disp.DrawRectangleRecWS( rl.GetCollisionRec( .{ .x = player.detection_box.x.* - 1, .y = player.detection_box.y.* - 1, .width = player.detection_box.width, .height = player.detection_box.height}, tile.box ), rl.BLUE);
                     }
 
                     if (!fly) {
@@ -148,9 +171,9 @@ pub fn main() anyerror!void
                     }
 
                 }
+                
             }
             
-            rl.EndDrawing();
         }
        
     }

src/physics.zig

@@ -49,7 +49,7 @@ pub const movement = struct {
 pub fn ApplyPlayerCollisions(player: *obj.Player, map: obj.Map) void {
 
     // for every tile
-    for (map.tiles.allocatedSlice()) |tile| {
+    for (map.tiles.items) |tile| {
 
         // check if any collision occured
         if ( rl.CheckCollisionRecs(player.box, tile.box) ) {

src/types.zig

@@ -3,7 +3,7 @@ const std = @import("std");
 
 pub const Object = struct {
     box: rl.Rectangle,
-    texture: ?rl.Texture2D,
+    texture: ?*rl.Texture2D,
 };
 
 pub const Player = struct {

src/utils.zig

@@ -0,0 +1,17 @@
+const rl = @import("raylib");
+
+pub fn GetMousePositionWS(camera: rl.Camera2D, screenWidth: f32, screenHeight: f32) rl.Vector2 {
+    var mouse_position = rl.GetMousePosition();
+
+    // wold space position vectors for left-top and right-botton respectivly
+    var ws_position_vector_lt: rl.Vector2 = .{ .x = camera.target.x - (screenWidth / 2) * (1 / camera.zoom), .y = camera.target.y - (screenHeight / 2) * (1 / camera.zoom)};
+    var ws_position_vector_rb: rl.Vector2 = .{ .x = camera.target.x + (screenWidth / 2) * (1 / camera.zoom), .y = camera.target.y + (screenHeight / 2) * (1 / camera.zoom)};
+    
+    // range vector of distances of screen height and width translated to worldspace coordinates
+    var ws_position_vector_range: rl.Vector2 = .{ .x = ws_position_vector_rb.x - ws_position_vector_lt.x, .y = ws_position_vector_rb.y - ws_position_vector_lt.y};
+    
+    // mouse position vector but it's a range between 0 and 1
+    var scaled_mouse_position_vector: rl.Vector2 = .{ .x = mouse_position.x / screenWidth, .y =  mouse_position.y / screenHeight};
+
+    return .{ .x = ws_position_vector_lt.x + scaled_mouse_position_vector.x * ws_position_vector_range.x, .y = -(ws_position_vector_lt.y + scaled_mouse_position_vector.y * ws_position_vector_range.y)};
+}