fn build(self : CanvasBackend, systems : Array[((
@Milky2018/selene/system.Backend
Backend) -> Unit, 
@Milky2018/selene/system.Schedule
Schedule, String)], canvas_width : Double, canvas_height : Double, fps : UInt, image_smooth : Bool, zoom : Double) -> (() -> Unit)

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fn draw_color_rect(self : CanvasBackend, x~ : Double, y~ : Double, width~ : Double, height~ : Double, color~ : String) -> Unit

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fn draw_gradient_rect(self : CanvasBackend, x~ : Double, y~ : Double, width~ : Double, height~ : Double, color_start~ : String, color_end~ : String) -> Unit

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fn draw_picture(self : CanvasBackend, png : String, x~ : Double, y~ : Double, width~ : Double, height~ : Double, transform~ : 
@Milky2018/selene/math.Transform
Transform, repeat~ : 
@Milky2018/selene/system.RepeatMode
RepeatMode) -> Unit

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fn draw_sprite(self : CanvasBackend, sprite_path : String, x~ : Double, y~ : Double, offset_x~ : Double, offset_y~ : Double, width~ : Double, height~ : Double, transform~ : 
@Milky2018/selene/math.Transform
Transform) -> Unit

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fn draw_stroke_rect(self : CanvasBackend, x~ : Double, y~ : Double, width~ : Double, height~ : Double, color~ : String) -> Unit

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fn draw_text(self : CanvasBackend, text : String, x~ : Double, y~ : Double, font~ : String, color~ : String) -> Unit

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fn get_canvas_size(self : CanvasBackend) -> 
@Milky2018/selene/math.Vec2D
Vec2D

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fn get_debug_info(self : CanvasBackend) -> 
@Milky2018/selene/system.DebugInfo
DebugInfo

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fn get_zoom(self : CanvasBackend) -> Double

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fn lock_mouse(self : CanvasBackend, locked : Ref[Bool]) -> Unit

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fn play_audio(_self : CanvasBackend, audio_path : String, volume~ : Double, loop_~ : Bool) -> Unit

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fn preload_audio(_self : CanvasBackend, audio_path : String) -> Unit

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fn preload_img(_self : CanvasBackend, path : String) -> Unit

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fn register_key_events(_self : CanvasBackend, pressed_keys : 
@moonbitlang/core/set.Set
Set[
@Milky2018/selene/system.Code
Code]) -> Unit

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fn register_mouse_events(self : CanvasBackend, mouse : 
@Milky2018/selene/system.Mouse
Mouse, mouse_movement : 
@Milky2018/selene/system.MouseMovement
MouseMovement) -> Unit

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