Get started on a level editor

.gitignore

@@ -1,3 +1,4 @@
 /assetsviewer
 /topdown
 /top-down-shooter
+/leveleditor

leveleditor.odin

@@ -0,0 +1,117 @@
+package leveleditor
+
+import rl "vendor:raylib"
+import "core:math"
+import "core:math/rand"
+import "core:fmt"
+import ui "vendor:microui"
+import "rlmui"
+
+Vec2  :: [2]f32
+Rect  :: rl.Rectangle
+Img   :: rl.Image
+Color :: rl.Color
+Tex   :: rl.Texture
+Key   :: rl.KeyboardKey
+
+SCREEN_WIDTH : i32 = 1400
+SCREEN_HEIGHT : i32 = 1000
+
+
+AppState :: struct {
+    dt: f32,
+    ctx: ^ui.Context,
+    keymap: map[string]Key,
+    mouse_drag_start: Maybe(Vec2),
+    tileset: Tex,
+} 
+
+init_state :: proc() -> ^AppState {
+    tileset := rl.LoadImage("./Assets/Tileset/tileset.png")
+    defer rl.UnloadImage(tileset)
+
+    keymap := make(map[string]Key)
+    keymap["Left"] = .A
+    keymap["Right"] = .D
+    keymap["Up"] = .W
+    keymap["Down"] = .S
+
+    ctx := rlmui.InitUIScope()
+    state := AppState {
+        keymap = keymap,
+        tileset = rl.LoadTextureFromImage(tileset),
+    }
+
+    return new_clone(state)
+}
+
+user_input :: proc(s: ^AppState) {
+    if rl.IsMouseButtonPressed(rl.MouseButton.LEFT) {
+        s.mouse_drag_start = rl.GetMousePosition()
+    }
+    if rl.IsMouseButtonReleased(rl.MouseButton.LEFT) {
+        s.mouse_drag_start = nil
+    }
+}
+
+update :: proc(s: ^AppState) {
+}
+
+draw :: proc(s: ^AppState) {
+    w, h := f32(s.tileset.width), f32(s.tileset.height)
+    src := Rect{0, 0, w, h}
+    ratio := h / w
+    scale :f32 = 2.6
+    dst := Rect{5, 5, w * scale, h * scale}
+    rl.DrawTexturePro(s.tileset, src, dst, {0,0}, 0, rl.WHITE)
+    pixels :f32 = 8
+    color_lines := Color{255, 255, 255, 127}
+    padding :f32 = 5
+    for row in 0..=h / pixels {
+        start := Vec2{0,         row * pixels * scale}
+        end   := Vec2{w * scale, row * pixels * scale}
+        rl.DrawLineEx(start + padding, end + padding, 1, color_lines)
+    }
+    for col in 0..=w / pixels {
+        start := Vec2{col * pixels * scale, 0}
+        end   := Vec2{col * pixels * scale, h * scale}
+        rl.DrawLineEx(start + padding, end + padding, 1, color_lines)
+    }
+    // Rectangular Mouse Selection
+    if mpos_start, ok := s.mouse_drag_start.(Vec2); ok {
+        mpos := rl.GetMousePosition()
+        start_x := min(mpos.x, mpos_start.x)
+        start_y := min(mpos.y, mpos_start.y)
+        w := abs(mpos.x - mpos_start.x)
+        h := abs(mpos.y - mpos_start.y)
+        rl.DrawRectangleLinesEx(Rect{start_x, start_y, w, h }, 4, rl.BLUE)
+    }
+}
+
+main :: proc() {
+    rl.SetTraceLogLevel(.ERROR)
+    rl.InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "Level Editor")
+    rl.SetTargetFPS(60)
+
+    state := init_state()
+    defer free(state)
+
+    for !rl.WindowShouldClose() {
+        state.dt = rl.GetFrameTime()
+
+        user_input(state)
+
+        update(state)
+
+        rl.BeginDrawing()
+        rl.ClearBackground(rl.GRAY)
+
+        draw(state)
+
+        free_all(context.temp_allocator)
+        rl.EndDrawing()
+    }
+
+    rl.UnloadTexture(state.tileset)
+    rl.CloseWindow()
+}