117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
package uix
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import (
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"fmt"
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"git.kirsle.net/apps/doodle/lib/render"
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"git.kirsle.net/apps/doodle/pkg/doodads"
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"git.kirsle.net/apps/doodle/pkg/level"
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"git.kirsle.net/apps/doodle/pkg/log"
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"git.kirsle.net/apps/doodle/pkg/userdir"
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)
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// InstallActors adds external Actors to the canvas to be superimposed on top
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// of the drawing.
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func (w *Canvas) InstallActors(actors level.ActorMap) error {
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w.actors = make([]*Actor, 0)
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for id, actor := range actors {
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doodad, err := doodads.LoadJSON(userdir.DoodadPath(actor.Filename))
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if err != nil {
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return fmt.Errorf("InstallActors: %s", err)
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}
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w.actors = append(w.actors, NewActor(id, actor, doodad))
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}
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return nil
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}
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// AddActor injects additional actors into the canvas, such as a Player doodad.
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func (w *Canvas) AddActor(actor *Actor) error {
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w.actors = append(w.actors, actor)
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return nil
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}
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// drawActors is a subroutine of Present() that superimposes the actors on top
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// of the level drawing.
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func (w *Canvas) drawActors(e render.Engine, p render.Point) {
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var (
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Viewport = w.ViewportRelative()
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S = w.Size()
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)
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// See if each Actor is in range of the Viewport.
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for i, a := range w.actors {
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if a == nil {
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log.Error("Canvas.drawActors: null actor at index %d (of %d actors)", i, len(w.actors))
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continue
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}
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var (
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actor = a.Actor // Static Actor instance from Level file, DO NOT CHANGE
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can = a.Canvas // Canvas widget that draws the actor
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actorPoint = actor.Point // XXX TODO: DO NOT CHANGE
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actorSize = can.Size()
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)
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// Create a box of World Coordinates that this actor occupies. The
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// Actor X,Y from level data is already a World Coordinate;
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// accomodate for the size of the Actor.
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actorBox := render.Rect{
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X: actorPoint.X,
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Y: actorPoint.Y,
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W: actorSize.W,
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H: actorSize.H,
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}
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// Is any part of the actor visible?
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if !Viewport.Intersects(actorBox) {
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continue // not visible on screen
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}
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drawAt := render.Point{
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X: p.X + w.Scroll.X + actorPoint.X + w.BoxThickness(1),
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Y: p.Y + w.Scroll.Y + actorPoint.Y + w.BoxThickness(1),
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}
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resizeTo := actorSize
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// XXX TODO: when an Actor hits the left or top edge and shrinks,
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// scrolling to offset that shrink is currently hard to solve.
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scrollTo := render.Origin
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// Handle cropping and scaling if this Actor's canvas can't be
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// completely visible within the parent.
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if drawAt.X+resizeTo.W > p.X+S.W {
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// Hitting the right edge, shrunk the width now.
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delta := (drawAt.X + resizeTo.W) - (p.X + S.W)
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resizeTo.W -= delta
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} else if drawAt.X < p.X {
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// Hitting the left edge. Cap the X coord and shrink the width.
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delta := p.X - drawAt.X // positive number
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drawAt.X = p.X
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// scrollTo.X -= delta // TODO
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resizeTo.W -= delta
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}
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if drawAt.Y+resizeTo.H > p.Y+S.H {
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// Hitting the bottom edge, shrink the height.
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delta := (drawAt.Y + resizeTo.H) - (p.Y + S.H)
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resizeTo.H -= delta
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} else if drawAt.Y < p.Y {
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// Hitting the top edge. Cap the Y coord and shrink the height.
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delta := p.Y - drawAt.Y
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drawAt.Y = p.Y
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// scrollTo.Y -= delta // TODO
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resizeTo.H -= delta
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}
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if resizeTo != actorSize {
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can.Resize(resizeTo)
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can.ScrollTo(scrollTo)
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}
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can.Present(e, drawAt)
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// Clean up the canvas size and offset.
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can.Resize(actorSize) // restore original size in case cropped
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can.ScrollTo(render.Origin)
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}
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}
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