diff --git a/projection.go b/projection.go
deleted file mode 100644
index c90d7d1..0000000
--- a/projection.go
+++ /dev/null
@@ -1,127 +0,0 @@
-package tins2020
-
-import (
-	"opslag.de/schobers/geom"
-	"opslag.de/schobers/zntg/ui"
-)
-
-func mapToTile(q geom.PointF32) geom.Point {
-	return geom.Pt(int(geom.Round32(q.X)), int(geom.Round32(q.Y)))
-}
-
-type projection struct {
-	center  geom.PointF32
-	zoom    float32
-	zoomInv float32
-
-	windowInteractRect geom.Rectangle
-	windowVisibleRect  geom.Rectangle
-	tileScreenDelta    geom.PointF32
-	tileScreenDeltaInv geom.PointF32
-	tileScreenOffset   geom.Point
-	tileScreenSize     geom.Point
-	tileFitScreenSize  geom.Point
-	windowCenter       geom.Point
-}
-
-func newProjection() projection {
-	return projection{zoom: 1, tileScreenDelta: geom.PtF32(64, 32), tileScreenDeltaInv: geom.PtF32(1./64, 1./32)}
-}
-
-func (p *projection) mapToScreen(x, y int) geom.Point {
-	return p.mapToScreenF(float32(x), float32(y))
-}
-
-func (p *projection) mapToScreenF(x, y float32) geom.Point {
-	translated := geom.PtF32(x-p.center.X, y-p.center.Y)
-	return geom.Pt(p.windowCenter.X+int((translated.X-translated.Y)*64*p.zoom), p.windowCenter.Y+int((translated.X+translated.Y)*32*p.zoom))
-}
-
-func (p *projection) screenToMap(x, y int) geom.PointF32 {
-	pos := p.screenToMapRel(x-p.windowCenter.X, y-p.windowCenter.Y)
-	return p.center.Add(pos)
-}
-
-func (p *projection) screenToMapInt(x, y int) geom.Point {
-	pos := p.screenToMap(x, y)
-	return mapToTile(pos)
-}
-
-func (p *projection) screenToMapRel(x, y int) geom.PointF32 {
-	normX := p.zoomInv * float32(x)
-	normY := p.zoomInv * float32(y)
-	return geom.PtF32(.5*(p.tileScreenDeltaInv.X*normX+p.tileScreenDeltaInv.Y*normY), .5*(-p.tileScreenDeltaInv.X*normX+p.tileScreenDeltaInv.Y*normY))
-}
-
-func (p *projection) screenToTileFitRect(pos geom.Point) geom.Rectangle {
-	return geom.RectRel(pos.X-p.tileFitScreenSize.X, pos.Y-p.tileFitScreenSize.Y, 2*p.tileFitScreenSize.X, 2*p.tileFitScreenSize.Y)
-}
-
-func (p *projection) screenToTileRect(pos geom.Point) geom.Rectangle {
-	return geom.RectRel(pos.X-p.tileScreenOffset.X, pos.Y-p.tileScreenOffset.Y, p.tileScreenSize.X, p.tileScreenSize.Y)
-}
-
-func (p *projection) update(renderer ui.Renderer) {
-	p.zoomInv = 1 / p.zoom
-
-	p.tileScreenOffset = geom.Pt(int(p.zoom*64), int(p.zoom*112))
-	p.tileScreenSize = geom.Pt(int(p.zoom*128), int(p.zoom*160))
-	p.tileFitScreenSize = geom.Pt(int(p.zoom*64), int(p.zoom*32))
-
-	windowF32 := renderer.Size()
-	window := geom.Pt(int(windowF32.X), int(windowF32.Y))
-	p.windowCenter = geom.Pt(window.X/2, window.Y/2)
-	p.windowInteractRect = geom.Rect(buttonBarWidth, 64, window.X-buttonBarWidth, window.Y)
-	p.windowVisibleRect = geom.Rect(buttonBarWidth, 0, window.X-buttonBarWidth, window.Y+p.tileScreenSize.Y) // Adding a tile height to the bottom for trees that stick out from the cells below.
-}
-
-func (p *projection) visibleTiles(action func(int, int, geom.Point)) {
-	visible := p.windowVisibleRect
-	topLeft := p.screenToMap(visible.Min.X, visible.Min.Y)
-	topRight := p.screenToMap(visible.Max.X, visible.Min.Y)
-	bottomLeft := p.screenToMap(visible.Min.X, visible.Max.Y)
-	bottomRight := p.screenToMap(visible.Max.X, visible.Max.Y)
-	minY, maxY := int(Floor32(topRight.Y)), int(Ceil32(bottomLeft.Y))
-	minX, maxX := int(Floor32(topLeft.X)), int(Ceil32(bottomRight.X))
-	for y := minY; y <= maxY; y++ {
-		for x := minX; x <= maxX; x++ {
-			pos := p.mapToScreen(x, y)
-			rectFit := p.screenToTileFitRect(pos)
-			if rectFit.Max.X < visible.Min.X || rectFit.Max.Y < visible.Min.Y {
-				continue
-			}
-			if rectFit.Min.X > visible.Max.X || rectFit.Min.Y > visible.Max.Y {
-				break
-			}
-			action(x, y, pos)
-		}
-	}
-}
-
-func (p *projection) Pan(ctx ui.Context, delta geom.PointF32) {
-	p.center = p.center.Add(delta.Mul(p.zoomInv))
-	p.update(ctx.Renderer())
-}
-
-func (p *projection) SetZoom(ctx ui.Context, center geom.PointF32, zoom float32) {
-	if p.zoom == zoom {
-		return
-	}
-	p.center = center.Sub(center.Sub(p.center).Mul(p.zoom / zoom))
-	p.zoom = zoom
-	p.update(ctx.Renderer())
-}
-
-func (p *projection) ZoomOut(ctx ui.Context, center geom.PointF32) {
-	if p.zoom <= .25 {
-		return
-	}
-	p.SetZoom(ctx, center, .5*p.zoom)
-}
-
-func (p *projection) ZoomIn(ctx ui.Context, center geom.PointF32) {
-	if p.zoom >= 2 {
-		return
-	}
-	p.SetZoom(ctx, center, 2*p.zoom)
-}
diff --git a/terrainrenderer.go b/terrainrenderer.go
index 52bde42..82e7039 100644
--- a/terrainrenderer.go
+++ b/terrainrenderer.go
@@ -3,6 +3,8 @@ package tins2020
 import (
 	"fmt"
 
+	"opslag.de/schobers/zntg/play"
+
 	"opslag.de/schobers/geom"
 	"opslag.de/schobers/zntg/ui"
 )
@@ -10,31 +12,30 @@ import (
 type terrainRenderer struct {
 	ui.ControlBase
 
-	game    *Game
-	hover   *geom.Point
-	project projection
+	game           *Game
+	hover          *geom.Point
+	viewBounds     geom.RectangleF32
+	interactBounds geom.RectangleF32
+	isometric      *play.IsometricProjection
 
 	drag ui.Dragable
 }
 
 func NewTerrainRenderer(game *Game) ui.Control {
-	renderer := &terrainRenderer{game: game, project: newProjection()}
+	renderer := &terrainRenderer{game: game, isometric: play.NewIsometricProjection(geom.PtF32(128, 64), geom.RectF32(0, 0, 100, 100))}
 
 	renderer.game.CenterChanged().AddHandler(func(ctx ui.Context, state interface{}) {
 		center := state.(geom.Point)
-		renderer.project.center = center.ToF32()
-		renderer.project.update(ctx.Renderer())
+		renderer.isometric.MoveCenterTo(center.ToF32())
 	})
-	// renderer.project.update(ctx.Renderer)
 	return renderer
 }
 
-func (r *terrainRenderer) Arrange(ctx ui.Context, _ geom.RectangleF32, _ geom.PointF32, _ ui.Control) {
-	r.project.update(ctx.Renderer())
-}
-
-func (r *terrainRenderer) Init(ctx ui.Context) error {
-	return nil
+func (r *terrainRenderer) Arrange(ctx ui.Context, bounds geom.RectangleF32, _ geom.PointF32, _ ui.Control) {
+	r.viewBounds = geom.RectF32(buttonBarWidth, 0, bounds.Dx()-buttonBarWidth, bounds.Dy())
+	r.isometric.SetViewBounds(r.viewBounds)
+	r.interactBounds = r.viewBounds
+	r.interactBounds.Min.Y += 64
 }
 
 func isControlKeyDown(ctx ui.Context) bool {
@@ -46,7 +47,7 @@ func (r *terrainRenderer) Handle(ctx ui.Context, event ui.Event) bool {
 	switch e := event.(type) {
 	case *ui.MouseButtonDownEvent:
 		pos := e.Pos()
-		if pos.ToInt().In(r.project.windowInteractRect) {
+		if pos.In(r.interactBounds) {
 			controlKeyDown := isControlKeyDown(ctx)
 			if e.Button == ui.MouseButtonMiddle || (e.Button == ui.MouseButtonLeft && controlKeyDown) {
 				if _, ok := r.drag.IsDragging(); !ok {
@@ -54,7 +55,7 @@ func (r *terrainRenderer) Handle(ctx ui.Context, event ui.Event) bool {
 				}
 			}
 			if e.Button == ui.MouseButtonLeft && !controlKeyDown {
-				pos := r.project.screenToMapInt(int(e.X), int(e.Y))
+				pos := r.isometric.ViewToTileInt(pos)
 				r.game.UserClickedTile(pos)
 			}
 			if e.Button == ui.MouseButtonRight {
@@ -62,62 +63,60 @@ func (r *terrainRenderer) Handle(ctx ui.Context, event ui.Event) bool {
 			}
 		}
 	case *ui.MouseButtonUpEvent:
-		pos := e.Pos().ToInt()
-		if pos.In(r.project.windowInteractRect) {
+		pos := e.Pos()
+		if pos.In(r.interactBounds) {
 			if _, ok := r.drag.IsDragging(); ok {
-				r.game.Terrain.Center = mapToTile(r.project.center)
+				r.game.Terrain.Center = r.isometric.TileInt(r.isometric.Center())
 				r.drag.Cancel()
 			}
 		}
 	case *ui.MouseMoveEvent:
 		pos := e.Pos()
-		if pos.ToInt().In(r.project.windowInteractRect) {
-			hover := r.project.screenToMapInt(int(e.X), int(e.Y))
+		if pos.In(r.interactBounds) {
+			hover := r.isometric.ViewToTileInt(pos)
 			r.hover = &hover
 		} else {
 			r.hover = nil
 		}
 		if _, ok := r.drag.IsDragging(); ok {
 			delta, _ := r.drag.Move(pos)
-			r.project.center = r.project.center.Sub(r.project.screenToMapRel(int(delta.X), int(delta.Y)))
-			r.project.update(ctx.Renderer())
+			r.isometric.Pan(r.isometric.ViewToTileRelative(delta.Invert()))
 		}
 		if r.hover != nil {
 			if e.MouseWheel < 0 {
-				r.project.ZoomOut(ctx, r.hover.ToF32())
+				r.isometric.ZoomOut(r.hover.ToF32())
 			} else if e.MouseWheel > 0 {
-				r.project.ZoomIn(ctx, r.hover.ToF32())
+				r.isometric.ZoomIn(r.hover.ToF32())
 			}
 		}
 	case *ui.MouseLeaveEvent:
 		r.hover = nil
-		r.project.update(ctx.Renderer())
 	case *ui.KeyDownEvent:
 		switch e.Key {
 		case ui.KeyPadPlus:
-			r.project.ZoomIn(ctx, r.project.center)
+			r.isometric.ZoomIn(r.isometric.Center())
 		case ui.KeyMinus:
-			r.project.ZoomOut(ctx, r.project.center)
+			r.isometric.ZoomOut(r.isometric.Center())
 		case ui.KeyPadMinus:
-			r.project.ZoomOut(ctx, r.project.center)
+			r.isometric.ZoomOut(r.isometric.Center())
 		case ui.KeyW:
-			r.project.Pan(ctx, geom.PtF32(-1, -1))
+			r.isometric.Pan(geom.PtF32(-1, -1))
 		case ui.KeyA:
-			r.project.Pan(ctx, geom.PtF32(-1, 1))
+			r.isometric.Pan(geom.PtF32(-1, 1))
 		case ui.KeyS:
-			r.project.Pan(ctx, geom.PtF32(1, 1))
+			r.isometric.Pan(geom.PtF32(1, 1))
 		case ui.KeyD:
-			r.project.Pan(ctx, geom.PtF32(1, -1))
+			r.isometric.Pan(geom.PtF32(1, -1))
 		}
 	}
 	return false
 }
 
 func (r *terrainRenderer) Render(ctx ui.Context) {
-	zoom := r.project.zoom
+	zoom := r.isometric.Zoom()
 	terrain := r.game.Terrain
-	toTileTexture := func(x, y int) ui.Texture {
-		temp := terrain.Temp.Value(x, y)
+	toTileTexture := func(tile geom.Point) ui.Texture {
+		temp := terrain.Temp.Value(tile.X, tile.Y)
 		if temp < .35 {
 			return ctx.Textures().ScaledByName("tile-snow", zoom)
 		}
@@ -195,26 +194,35 @@ func (r *terrainRenderer) Render(ctx ui.Context) {
 	// vertical (tile): [96,160) = 64
 	// vertical (total): [0,160) = 160
 
-	r.project.visibleTiles(func(x, y int, pos geom.Point) {
-		text := toTileTexture(x, y)
-		rect := r.project.screenToTileRect(pos)
-		ctx.Renderer().DrawTexture(text, rect.ToF32())
+	topLeft := geom.PtF32(-64*zoom, -112*zoom)
+	bottomRight := geom.PtF32(64*zoom, 48*zoom)
+	textureRect := func(center geom.PointF32) geom.RectangleF32 {
+		return geom.RectangleF32{Min: center.Add(topLeft), Max: center.Add(bottomRight)}
+	}
+	hoverTexture := ctx.Textures().ScaledByName("tile-hover", zoom)
 
-		if r.hover != nil && x == r.hover.X && y == r.hover.Y {
-			ctx.Renderer().DrawTexture(ctx.Textures().ScaledByName("tile-hover", zoom), rect.ToF32())
+	r.isometric.EnumerateInt(func(tile geom.Point, view geom.PointF32) {
+		text := toTileTexture(tile)
+		rect := textureRect(view)
+		ctx.Renderer().DrawTexture(text, rect)
+		// if r.game.Debug {
+		// 	ctx.Renderer().FillRectangle(view.Add2D(-1, -1).RectRel2D(2, 2), color.White)
+		// 	ctx.Fonts().TextAlign("debug", view, color.White, fmt.Sprintf("%d, %d", tile.X, tile.Y), ui.AlignCenter)
+		// }
+		if r.hover != nil && tile.X == r.hover.X && tile.Y == r.hover.Y {
+			ctx.Renderer().DrawTexture(hoverTexture, rect)
 		}
 	})
 
-	r.project.visibleTiles(func(x, y int, pos geom.Point) {
-		text := toItemTexture(x, y)
+	r.isometric.EnumerateInt(func(tile geom.Point, view geom.PointF32) {
+		text := toItemTexture(tile.X, tile.Y)
 		if text == nil {
 			return
 		}
 
-		placeX, placeY := terrain.PlaceX.Value(x, y), terrain.PlaceY.Value(x, y)
-		pos = r.project.mapToScreenF(float32(x)-.2+float32(.9*placeX-.45), float32(y)-.2+float32(.9*placeY-.45))
-		rect := r.project.screenToTileRect(pos)
-		ctx.Renderer().DrawTexture(text, rect.ToF32())
-		// ctx.Fonts().Text("debug", pos.ToF32(), color.White, fmt.Sprintf("%d, %d", x, y))
+		placeX, placeY := terrain.PlaceX.Value(tile.X, tile.Y), terrain.PlaceY.Value(tile.X, tile.Y)
+		displaced := r.isometric.TileToView(tile.ToF32().Add2D(-.2+.9*float32(placeX)-.45, -.2+.9*float32(placeY)-.45))
+		rect := textureRect(displaced)
+		ctx.Renderer().DrawTexture(text, rect)
 	})
 }