package uix import ( "git.kirsle.net/apps/doodle/level" "git.kirsle.net/apps/doodle/pkg/wallpaper" "git.kirsle.net/apps/doodle/render" ) // Wallpaper configures the wallpaper in a Canvas. type Wallpaper struct { pageType level.PageType maxWidth int64 maxHeight int64 corner render.Texturer top render.Texturer left render.Texturer repeat render.Texturer } // Valid returns whether the Wallpaper is configured. Only Levels should // have wallpapers and Doodads will have nil ones. func (wp *Wallpaper) Valid() bool { return wp.repeat != nil } // PresentWallpaper draws the wallpaper. func (w *Canvas) PresentWallpaper(e render.Engine, p render.Point) error { var ( wp = w.wallpaper S = w.Size() size = wp.corner.Size() Viewport = w.ViewportRelative() origin = render.Point{ X: p.X + w.Scroll.X + w.BoxThickness(1), Y: p.Y + w.Scroll.Y + w.BoxThickness(1), } limit = render.Point{ // NOTE: we add + the texture size so we would actually draw one // full extra texture out-of-bounds for the repeating backgrounds. // This is cuz for scrolling we offset the draw spot on a loop. X: origin.X + S.W - w.BoxThickness(1) + size.W, Y: origin.Y + S.H - w.BoxThickness(1) + size.H, } ) // For tiled textures, compute the offset amount. If we are scrolled away // from the Origin (0,0) we find out by how far (subtract full tile sizes) // and use the remainder as an offset for drawing the tiles. var dx, dy int32 if origin.X > 0 { for origin.X > 0 && origin.X > size.W { origin.X -= size.W } dx = origin.X origin.X = 0 } if origin.Y > 0 { for origin.Y > 0 && origin.Y > size.H { origin.Y -= size.H } dy = origin.Y origin.Y = 0 } // And capping the scroll delta in the other direction. if limit.X < S.W { limit.X = S.W } if limit.Y < S.H { // TODO: slight flicker on bottom edge when scrolling down limit.Y = S.H } // Tile the repeat texture. for x := origin.X - size.W; x < limit.X; x += size.W { for y := origin.Y - size.H; y < limit.Y; y += size.H { src := render.Rect{ W: size.W, H: size.H, } dst := render.Rect{ X: x + dx, Y: y + dy, W: src.W, H: src.H, } // Trim the edges of the destination box, like in canvas.go#Present render.TrimBox(&src, &dst, p, S, w.BoxThickness(1)) e.Copy(wp.repeat, src, dst) } } // The left edge corner tiled along the left edge. if wp.pageType > level.Unbounded { for y := origin.Y; y < limit.Y; y += size.H { src := render.Rect{ W: size.W, H: size.H, } dst := render.Rect{ X: origin.X, Y: y + dy, W: src.W, H: src.H, } render.TrimBox(&src, &dst, p, S, w.BoxThickness(1)) e.Copy(wp.left, src, dst) } // The top edge tiled along the top edge. for x := origin.X; x < limit.X; x += size.W { src := render.Rect{ W: size.W, H: size.H, } dst := render.Rect{ X: x, Y: origin.Y, W: src.W, H: src.H, } render.TrimBox(&src, &dst, p, S, w.BoxThickness(1)) e.Copy(wp.top, src, dst) } // The top left corner for all page types except Unbounded. if Viewport.Intersects(size) { src := render.Rect{ W: size.W, H: size.H, } dst := render.Rect{ X: origin.X, Y: origin.Y, W: src.W, H: src.H, } render.TrimBox(&src, &dst, p, S, w.BoxThickness(1)) e.Copy(wp.corner, src, dst) } } return nil } // Load the wallpaper settings from a level. func (wp *Wallpaper) Load(e render.Engine, pageType level.PageType, v *wallpaper.Wallpaper) error { wp.pageType = pageType if tex, err := v.CornerTexture(e); err == nil { wp.corner = tex } else { return err } if tex, err := v.TopTexture(e); err == nil { wp.top = tex } else { return err } if tex, err := v.LeftTexture(e); err == nil { wp.left = tex } else { return err } if tex, err := v.RepeatTexture(e); err == nil { wp.repeat = tex } else { return err } return nil }