91 lines
2.2 KiB
Odin
91 lines
2.2 KiB
Odin
package main
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import "core:math"
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import rl "vendor:raylib"
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Game :: struct {
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running: bool,
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time: f32, // total time elapsed
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tilemap: Tilemap,
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camera: Camera2D,
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}
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Camera2D :: struct {
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offset: rl.Vector2,
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zoom: f32,
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}
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CAMERA_PAN_SPEED :: 400
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game_init :: proc() -> Game {
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g := Game {
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running = true,
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time = 0,
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}
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g.tilemap = tilemap_init()
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g.camera = camera_init()
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return g
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}
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camera_init :: proc() -> Camera2D {
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camera_x := f32(MAP_WIDTH * TILE_SIZE) * 0.5
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camera_y := f32(MAP_HEIGHT * TILE_SIZE) * 0.5
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return Camera2D{offset = {camera_x, camera_y}, zoom = 1.0}
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}
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camera_update :: proc(camera: ^Camera2D, dt: f32) {
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pan := rl.Vector2{0, 0}
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if rl.IsKeyDown(.W) || rl.IsKeyDown(.UP) {pan.y -= 1}
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if rl.IsKeyDown(.S) || rl.IsKeyDown(.DOWN) {pan.y += 1}
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if rl.IsKeyDown(.A) || rl.IsKeyDown(.LEFT) {pan.x -= 1}
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if rl.IsKeyDown(.D) || rl.IsKeyDown(.RIGHT) {pan.x += 1}
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if pan.x != 0 || pan.y != 0 {
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len := math.sqrt(pan.x * pan.x + pan.y * pan.y)
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pan.x /= len
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pan.y /= len
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camera.offset.x += pan.x * CAMERA_PAN_SPEED * dt / camera.zoom
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camera.offset.y += pan.y * CAMERA_PAN_SPEED * dt / camera.zoom
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}
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wheel := rl.GetMouseWheelMove()
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if wheel != 0 {
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camera.zoom = math.clamp(camera.zoom + wheel * 0.15, 0.35, 3.0)
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}
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}
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world_to_screen :: proc(camera: ^Camera2D, wx, wy: f32) -> (f32, f32) {
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screen_x := (wx - camera.offset.x) * camera.zoom + f32(WINDOW_WIDTH) * 0.5
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screen_y := (wy - camera.offset.y) * camera.zoom + f32(WINDOW_HEIGHT) * 0.5
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return screen_x, screen_y
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}
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screen_to_world :: proc(camera: ^Camera2D, sx, sy: f32) -> (f32, f32) {
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world_x := (sx - f32(WINDOW_WIDTH) * 0.5) / camera.zoom + camera.offset.x
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world_y := (sy - f32(WINDOW_HEIGHT) * 0.5) / camera.zoom + camera.offset.y
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return world_x, world_y
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}
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game_update :: proc(g: ^Game, dt: f32) {
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g.time += dt
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if rl.IsKeyPressed(.ESCAPE) {
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g.running = false
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}
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camera_update(&g.camera, dt)
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}
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game_draw :: proc(g: ^Game) {
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tilemap_draw(&g.tilemap, &g.camera)
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fps := rl.GetFPS()
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rl.DrawText(rl.TextFormat("FPS: %i", fps), 10, 36, 20, rl.GREEN)
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rl.DrawText(rl.TextFormat("Time: %.1fs", g.time), 10, 62, 20, rl.GRAY)
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rl.DrawText(rl.TextFormat("Zoom: %2f", g.camera.zoom), 10, 88, 20, rl.GRAY)
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}
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game_shutdown :: proc(g: ^Game) {
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tilemap_destroy(&g.tilemap)
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}
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