Added clipping to terrain renderer.

math.go

@@ -0,0 +1,7 @@
+package tins2020
+
+import "math"
+
+func Ceil32(x float32) float32 { return float32(math.Ceil(float64(x))) }
+
+func Floor32(x float32) float32 { return float32(math.Floor(float64(x))) }

projection.go

@@ -0,0 +1,90 @@
+package tins2020
+
+import (
+	"log"
+
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+type projection struct {
+	center  PointF
+	zoom    float32
+	zoomInv float32
+
+	windowRect         sdl.Rect
+	tileScreenDelta    PointF
+	tileScreenDeltaInv PointF
+	tileScreenOffset   Point
+	tileScreenSize     Point
+	tileFitScreenSize  Point
+	windowCenter       Point
+}
+
+func newProjection() projection {
+	return projection{zoom: 1, tileScreenDelta: PtF(65, 32), tileScreenDeltaInv: PtF(1./65, 1./32)}
+}
+
+func (p *projection) mapToScreen(x, y int32) Point {
+	return p.mapToScreenF(float32(x), float32(y))
+}
+
+func (p *projection) mapToScreenF(x, y float32) Point {
+	translated := PtF(x-p.center.X, y-p.center.Y)
+	return Pt(p.windowCenter.X+int32((translated.X-translated.Y)*65*p.zoomInv), p.windowCenter.Y+int32((translated.X+translated.Y)*32*p.zoomInv))
+}
+
+func (p *projection) screenToMap(x, y int32) PointF {
+	pos := p.screenToMapRel(x-p.windowCenter.X, y-p.windowCenter.Y)
+	return p.center.Add(pos)
+}
+
+func (p *projection) screenToMapRel(x, y int32) PointF {
+	normX := p.zoom * float32(x)
+	normY := p.zoom * float32(y)
+	return PtF(.5*(p.tileScreenDeltaInv.X*normX+p.tileScreenDeltaInv.Y*normY), .5*(-p.tileScreenDeltaInv.X*normX+p.tileScreenDeltaInv.Y*normY))
+}
+
+func (p *projection) screenToTileFitRect(pos Point) *sdl.Rect {
+	return &sdl.Rect{X: pos.X - p.tileFitScreenSize.X, Y: pos.Y - p.tileFitScreenSize.Y, W: 2 * p.tileFitScreenSize.X, H: 2 * p.tileFitScreenSize.Y}
+}
+
+func (p *projection) screenToTileRect(pos Point) *sdl.Rect {
+	return &sdl.Rect{X: pos.X - p.tileScreenOffset.X, Y: pos.Y - p.tileScreenOffset.Y, W: p.tileScreenSize.X, H: p.tileScreenSize.Y}
+}
+
+func (p *projection) update(renderer *sdl.Renderer) {
+	p.zoomInv = 1 / p.zoom
+
+	p.tileScreenOffset = Pt(int32(p.zoomInv*256), int32(p.zoomInv*300))
+	p.tileScreenSize = Pt(int32(p.zoomInv*512), int32(p.zoomInv*512))
+	p.tileFitScreenSize = Pt(int32(p.zoomInv*65), int32(p.zoomInv*32))
+
+	windowW, windowH, err := renderer.GetOutputSize()
+	if err != nil {
+		log.Fatal(err)
+	}
+	p.windowCenter = Pt(windowW/2, windowH/2)
+	p.windowRect = sdl.Rect{X: 200, Y: 200, W: windowW - 400, H: windowH - 400}
+}
+
+func (p *projection) visibleTiles(action func(int32, int32, Point)) {
+	topLeft := p.screenToMap(p.windowRect.X, p.windowRect.Y)
+	topRight := p.screenToMap(p.windowRect.X+p.windowRect.W, p.windowRect.Y)
+	bottomLeft := p.screenToMap(p.windowRect.X, p.windowRect.Y+p.windowRect.H)
+	bottomRight := p.screenToMap(p.windowRect.X+p.windowRect.W, p.windowRect.Y+p.windowRect.H)
+	minY, maxY := int32(Floor32(topRight.Y)), int32(Ceil32(bottomLeft.Y))
+	minX, maxX := int32(Floor32(topLeft.X)), int32(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.X+rectFit.W < p.windowRect.X || rectFit.Y+rectFit.H < p.windowRect.Y {
+				continue
+			}
+			if rectFit.X > p.windowRect.X+p.windowRect.W || rectFit.Y > p.windowRect.Y+p.windowRect.H {
+				break
+			}
+			action(x, y, pos)
+		}
+	}
+}

terrainrenderer.go

@@ -2,11 +2,9 @@ package tins2020
 
 import (
 	"fmt"
-	"log"
-
-	"opslag.de/schobers/geom"
 
 	"github.com/veandco/go-sdl2/sdl"
+	"opslag.de/schobers/geom"
 )
 
 type terrainRenderer struct {
@@ -23,59 +21,6 @@ type interaction struct {
 	mouseDrag     *Point
 }
 
-type projection struct {
-	center  PointF
-	zoom    float32
-	zoomInv float32
-
-	tileScreenDelta    PointF
-	tileScreenDeltaInv PointF
-	tileScreenOffset   Point
-	tileScreenSize     Point
-	windowCenter       Point
-}
-
-func newProjection() projection {
-	return projection{zoom: 1, tileScreenDelta: PtF(65, 32), tileScreenDeltaInv: PtF(1./65, 1./32)}
-}
-
-func (p *projection) update(renderer *sdl.Renderer) {
-	p.zoomInv = 1 / p.zoom
-
-	p.tileScreenOffset = Pt(int32(p.zoomInv*256), int32(p.zoomInv*300))
-	p.tileScreenSize = Pt(int32(p.zoomInv*512), int32(p.zoomInv*512))
-
-	windowW, windowH, err := renderer.GetOutputSize()
-	if err != nil {
-		log.Fatal(err)
-	}
-	p.windowCenter = Pt(windowW/2, windowH/2)
-}
-
-func (p *projection) mapToScreen(x, y int32) Point {
-	return p.mapToScreenF(float32(x), float32(y))
-}
-
-func (p *projection) mapToScreenF(x, y float32) Point {
-	translated := PtF(x-p.center.X, y-p.center.Y)
-	return Pt(p.windowCenter.X+int32((translated.X-translated.Y)*65*p.zoomInv), p.windowCenter.Y+int32((translated.X+translated.Y)*32*p.zoomInv))
-}
-
-func (p *projection) screenToMapRel(x, y int32) PointF {
-	normX := p.zoom * float32(x)
-	normY := p.zoom * float32(y)
-	return PtF(.5*(p.tileScreenDeltaInv.X*normX+p.tileScreenDeltaInv.Y*normY), .5*(-p.tileScreenDeltaInv.X*normX+p.tileScreenDeltaInv.Y*normY))
-}
-
-func (p *projection) screenToMap(x, y int32) PointF {
-	pos := p.screenToMapRel(x-p.windowCenter.X, y-p.windowCenter.Y)
-	return p.center.Add(pos)
-}
-
-func (p *projection) screenToTileRect(pos Point) *sdl.Rect {
-	return &sdl.Rect{X: pos.X - p.tileScreenOffset.X, Y: pos.Y - p.tileScreenOffset.Y, W: p.tileScreenSize.X, H: p.tileScreenSize.Y}
-}
-
 func NewTerrainRenderer(terrain *Map) Control {
 	return &terrainRenderer{terrain: terrain, project: newProjection()}
 }
@@ -186,37 +131,40 @@ func (r *terrainRenderer) Render(ctx *Context) {
 	// vertical: [267,332) = 65
 
 	hover := Pt(int32(geom.Round32(r.hover.X)), int32(geom.Round32(r.hover.Y)))
-	for y := int32(-100); y < 100; y++ {
+	r.project.visibleTiles(func(x, y int32, pos Point) {
-		for x := int32(-100); x < 100; x++ {
 		if x == hover.X && y == hover.Y {
-				continue
+			return
 		}
 		temp := r.terrain.Temp.Value(x, y)
 		humid := r.terrain.Humid.Value(x, y)
 		text := toTileTexture(temp, humid)
-			pos := r.project.mapToScreen(x, y)
+		rect := r.project.screenToTileRect(pos)
-			text.Copy(ctx.Renderer, r.project.screenToTileRect(pos))
+		text.Copy(ctx.Renderer, rect)
-		}
+	})
-	}
 
-	for y := int32(-100); y < 100; y++ {
+	r.project.visibleTiles(func(x, y int32, pos Point) {
-		for x := int32(-100); x < 100; x++ {
 		variant := r.terrain.Variant.Value(x, y)
 		if variant < -1 || variant > 1 {
-				continue
+			return
 		}
 
 		temp := r.terrain.Temp.Value(x, y)
 		humid := r.terrain.Humid.Value(x, y)
 		text := toPropTexture(temp, humid, variant)
 		if text == nil {
-				continue
+			return
 		}
 
 		placeX, placeY := r.terrain.PlaceX.Value(x, y), r.terrain.PlaceY.Value(x, y)
-			pos := r.project.mapToScreenF(float32(x)-.2+float32(.8*placeX-.4), float32(y)-.2+float32(.8*placeY-.4))
+		pos = r.project.mapToScreenF(float32(x)-.2+float32(.8*placeX-.4), float32(y)-.2+float32(.8*placeY-.4))
-
 		text.Copy(ctx.Renderer, r.project.screenToTileRect(pos))
-		}
+	})
-	}
+
+	// gfx.RectangleColor(ctx.Renderer, r.project.windowRect.X, r.project.windowRect.Y, r.project.windowRect.X+r.project.windowRect.W, r.project.windowRect.Y+r.project.windowRect.H, sdl.Color{R: 255, A: 255})
+	// for y := int32(-40); y < 40; y++ {
+	// 	for x := int32(-40); x < 40; x++ {
+	// 		pos := r.project.mapToScreen(x, y)
+	// 		ctx.Fonts.Font("debug").RenderCopy(ctx.Renderer, fmt.Sprintf("(%d, %d)", x, y), pos, sdl.Color{R: 255, A: 255})
+	// 	}
+	// }
 }