package uix import ( "errors" "fmt" "strings" "git.kirsle.net/apps/doodle/pkg/doodads" "git.kirsle.net/apps/doodle/pkg/level" "git.kirsle.net/apps/doodle/pkg/log" "git.kirsle.net/apps/doodle/pkg/scripting" "git.kirsle.net/go/render" ) // InstallActors adds external Actors to the canvas to be superimposed on top // of the drawing. func (w *Canvas) InstallActors(actors level.ActorMap) error { var errs []string w.actors = make([]*Actor, 0) for id, actor := range actors { doodad, err := doodads.LoadFromEmbeddable(actor.Filename, w.level) if err != nil { errs = append(errs, fmt.Sprintf("%s: %s", actor.Filename, err.Error())) continue } // Create the "live" Actor to exist in the world, and set its world // position to the Point defined in the level data. liveActor := NewActor(id, actor, doodad) liveActor.MoveTo(actor.Point) w.actors = append(w.actors, liveActor) } if len(errs) > 0 { return errors.New(strings.Join(errs, "\n")) } return nil } // Actors returns the list of actors currently in the Canvas. func (w *Canvas) Actors() []*Actor { return w.actors } // ClearActors removes all the actors from the Canvas. func (w *Canvas) ClearActors() { w.actors = []*Actor{} } // SetScriptSupervisor assigns the Canvas scripting supervisor to enable // interaction with actor scripts. func (w *Canvas) SetScriptSupervisor(s *scripting.Supervisor) { w.scripting = s } // InstallScripts loads all the current actors' scripts into the scripting // engine supervisor. func (w *Canvas) InstallScripts() error { if w.scripting == nil { return errors.New("no script supervisor is configured for this canvas") } if len(w.actors) == 0 { return errors.New("no actors exist in this canvas to install scripts for") } for _, actor := range w.actors { vm := w.scripting.To(actor.ID()) // Security: expose a selective API to the actor to the JS engine. vm.Self = w.MakeSelfAPI(actor) vm.Set("Self", vm.Self) if _, err := vm.Run(actor.Doodad().Script); err != nil { log.Error("Run script for actor %s failed: %s", actor.ID(), err) } // Call the main() function. if err := vm.Main(); err != nil { log.Error("main() for actor %s errored: %s", actor.ID(), err) } } return nil } // AddActor injects additional actors into the canvas, such as a Player doodad. func (w *Canvas) AddActor(actor *Actor) error { w.actors = append(w.actors, actor) return nil } // drawActors is a subroutine of Present() that superimposes the actors on top // of the level drawing. func (w *Canvas) drawActors(e render.Engine, p render.Point) { var ( Viewport = w.ViewportRelative() S = w.Size() ) // See if each Actor is in range of the Viewport. for i, a := range w.actors { if a == nil { log.Error("Canvas.drawActors: null actor at index %d (of %d actors)", i, len(w.actors)) continue } // Skip hidden actors. if a.hidden { continue } var ( can = a.Canvas // Canvas widget that draws the actor actorPoint = a.Position() actorSize = a.Size() resizeTo = actorSize ) // Adjust actor position and size by the zoom level. actorPoint.X = w.ZoomMultiply(actorPoint.X) actorPoint.Y = w.ZoomMultiply(actorPoint.Y) resizeTo.W = w.ZoomMultiply(resizeTo.W) resizeTo.H = w.ZoomMultiply(resizeTo.H) // Tell the actor's canvas to copy our zoom level so it resizes its image too. can.Zoom = w.Zoom // Create a box of World Coordinates that this actor occupies. The // Actor X,Y from level data is already a World Coordinate; // accomodate for the size of the Actor. actorBox := render.Rect{ X: actorPoint.X, Y: actorPoint.Y, W: actorSize.W, H: actorSize.H, } // Is any part of the actor visible? if !Viewport.Intersects(actorBox) { continue // not visible on screen } drawAt := render.Point{ X: p.X + w.Scroll.X + actorPoint.X + w.BoxThickness(1), Y: p.Y + w.Scroll.Y + actorPoint.Y + w.BoxThickness(1), } // XXX TODO: when an Actor hits the left or top edge and shrinks, // scrolling to offset that shrink is currently hard to solve. scrollTo := render.Origin // Handle cropping and scaling if this Actor's canvas can't be // completely visible within the parent. if drawAt.X+resizeTo.W > p.X+S.W { // Hitting the right edge, shrunk the width now. delta := (drawAt.X + resizeTo.W) - (p.X + S.W) resizeTo.W -= delta } else if drawAt.X < p.X { // Hitting the left edge. Cap the X coord and shrink the width. delta := p.X - drawAt.X // positive number drawAt.X = p.X // scrollTo.X -= delta / 2 // TODO resizeTo.W -= delta } if drawAt.Y+resizeTo.H > p.Y+S.H { // Hitting the bottom edge, shrink the height. delta := (drawAt.Y + resizeTo.H) - (p.Y + S.H) resizeTo.H -= delta } else if drawAt.Y < p.Y { // Hitting the top edge. Cap the Y coord and shrink the height. delta := p.Y - drawAt.Y drawAt.Y = p.Y // scrollTo.Y -= delta // TODO resizeTo.H -= delta } if resizeTo != actorSize { can.Resize(resizeTo) can.ScrollTo(scrollTo) } can.Present(e, drawAt) // Clean up the canvas size and offset. can.Resize(actorSize) // restore original size in case cropped can.ScrollTo(render.Origin) } }