Added renderer.

Added props.
Added map movement (dragging & hovering).

cmd/example/example.go

@@ -1,70 +0,0 @@
-// author: Jacky Boen
-
-package main
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/veandco/go-sdl2/img"
-	"github.com/veandco/go-sdl2/sdl"
-)
-
-var winTitle string = "Go-SDL2 Texture"
-var winWidth, winHeight int32 = 800, 600
-var imageName string = "../../assets/test.png"
-
-func run() int {
-	var window *sdl.Window
-	var renderer *sdl.Renderer
-	var texture *sdl.Texture
-	var src, dst sdl.Rect
-	var err error
-
-	window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
-		winWidth, winHeight, sdl.WINDOW_SHOWN)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", err)
-		return 1
-	}
-	defer window.Destroy()
-
-	renderer, err = sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Failed to create renderer: %s\n", err)
-		return 2
-	}
-	defer renderer.Destroy()
-
-	image, err := img.Load(imageName)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Failed to load PNG: %s\n", err)
-		return 3
-	}
-	defer image.Free()
-
-	texture, err = renderer.CreateTextureFromSurface(image)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Failed to create texture: %s\n", err)
-		return 4
-	}
-	defer texture.Destroy()
-
-	src = sdl.Rect{0, 0, 512, 512}
-	dst = sdl.Rect{100, 50, 512, 512}
-
-	renderer.Clear()
-	renderer.SetDrawColor(255, 0, 0, 255)
-	renderer.FillRect(&sdl.Rect{0, 0, int32(winWidth), int32(winHeight)})
-	renderer.Copy(texture, &src, &dst)
-	renderer.Present()
-
-	sdl.PollEvent()
-	sdl.Delay(2000)
-
-	return 0
-}
-
-func main() {
-	os.Exit(run())
-}

cmd/tins2020/terrainrenderer.go

@@ -1,41 +0,0 @@
-package main
-
-import (
-	"github.com/veandco/go-sdl2/sdl"
-	"opslag.de/schobers/tins2020"
-)
-
-type terrainRenderer struct {
-	terrain *tins2020.Map
-	center  tins2020.PointF
-	zoom    float32
-}
-
-func newTerrainRenderer(terrain *tins2020.Map) *terrainRenderer {
-	return &terrainRenderer{terrain: terrain}
-}
-
-func (r *terrainRenderer) Render(ctx *tins2020.Context) {
-	tempToTexture := func(temp float64) *tins2020.Texture {
-		if temp < .2 {
-			return ctx.Textures.Texture("snow")
-		}
-		if temp > .8 {
-			return ctx.Textures.Texture("dirt")
-		}
-		return ctx.Textures.Texture("grass")
-	}
-
-	// horizontal: [191, 321) = 130
-	// vertical: [267,332) = 65
-
-	for y := int32(0); y < 10; y++ {
-		left := -y * 65
-		top := y * 32
-		for x := int32(0); x < 10; x++ {
-			temp := r.terrain.Temp.Value(int(x), int(y))
-			text := tempToTexture(temp)
-			text.Copy(ctx.Renderer, &sdl.Rect{X: left + x*65, Y: top + x*32, W: 512, H: 512})
-		}
-	}
-}

cmd/tins2020/tins2020.go

@@ -28,7 +28,7 @@ func run() error {
 	}
 	defer sdl.Quit()
 
-	logSDLVersion()
+	// logSDLVersion()
 
 	if err := ttf.Init(); err != nil {
 		return err
@@ -69,24 +69,66 @@ func run() error {
 		return err
 	}
 	err = ctx.Textures.Load(
-		"dirt", "images/dirt.png",
+		"tile-dirt", "images/tile_dirt.png",
-		"grass", "images/grass.png",
+		"tile-grass", "images/tile_grass.png",
-		"snow", "images/snow.png",
+		"tile-snow", "images/tile_snow.png",
+
+		"cactus-small-1", "images/cactus_short_NE.png",
+		"cactus-small-2", "images/cactus_short_NW.png",
+		"cactus-small-3", "images/cactus_short_SW.png",
+		"cactus-small-4", "images/cactus_short_SE.png",
+
+		"cactus-tall-1", "images/cactus_tall_NE.png",
+		"cactus-tall-2", "images/cactus_tall_NW.png",
+		"cactus-tall-3", "images/cactus_tall_SW.png",
+		"cactus-tall-4", "images/cactus_tall_SE.png",
+
+		"tree-fat-1", "images/tree_fat_NE.png",
+		"tree-fat-2", "images/tree_fat_NW.png",
+		"tree-fat-3", "images/tree_fat_SW.png",
+		"tree-fat-4", "images/tree_fat_SE.png",
+
+		"tree-pine-1", "images/tree_pineDefaultA_NE.png",
+		"tree-pine-2", "images/tree_pineDefaultA_NW.png",
+		"tree-pine-3", "images/tree_pineDefaultA_SW.png",
+		"tree-pine-4", "images/tree_pineDefaultA_SE.png",
+
+		"grass-small-1", "images/grass_NE.png",
+		"grass-small-2", "images/grass_NW.png",
+		"grass-small-3", "images/grass_SW.png",
+		"grass-small-4", "images/grass_SE.png",
+
+		"grass-leafs-1", "images/grass_leafs_NE.png",
+		"grass-leafs-2", "images/grass_leafs_NW.png",
+		"grass-leafs-3", "images/grass_leafs_SW.png",
+		"grass-leafs-4", "images/grass_leafs_SE.png",
+
+		"bush-small-1", "images/plant_bushSmall_NE.png",
+		"bush-small-2", "images/plant_bushSmall_NW.png",
+		"bush-small-3", "images/plant_bushSmall_SW.png",
+		"bush-small-4", "images/plant_bushSmall_SE.png",
+
+		"bush-large-1", "images/plant_bushLarge_NE.png",
+		"bush-large-2", "images/plant_bushLarge_NW.png",
+		"bush-large-3", "images/plant_bushLarge_SW.png",
+		"bush-large-4", "images/plant_bushLarge_SE.png",
 	)
 	if err != nil {
 		return err
 	}
 
 	game := tins2020.NewGame()
-	tr := newTerrainRenderer(game.Terrain)
+	control := tins2020.NewTerrainRenderer(game.Terrain)
+	err = control.Init(ctx)
+	if err != nil {
+		return err
+	}
 
-	running := true
+	for {
-	for running {
 		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
 			switch e := event.(type) {
 			case *sdl.QuitEvent:
-				println("Quit")
+				ctx.Quit()
-				running = false
 				break
 			case *sdl.WindowEvent:
 				switch e.Event {
@@ -94,17 +136,22 @@ func run() error {
 					x, y := window.GetPosition()
 					ctx.Settings.Window.Location = &tins2020.Point{X: x, Y: y}
 				}
+			case *sdl.KeyboardEvent:
+				switch e.Keysym.Sym {
+				case sdl.K_ESCAPE:
+					ctx.Quit()
 				}
 			}
+			control.Handle(ctx, event)
+		}
+
+		if ctx.ShouldQuit {
+			break
+		}
 
 		renderer.SetDrawColor(0, 0, 0, 255)
 		renderer.Clear()
-		// renderer.SetDrawColor(255, 0, 0, 255)
+		control.Render(ctx)
-		// renderer.FillRect(&sdl.Rect{0, 0, 200, 200})
-		// ctx.Textures.Texture("grass").Copy(renderer, &sdl.Rect{X: 200, Y: 100, W: 456, H: 356})
-		// ctx.Textures.Texture("dirt").Copy(renderer, &sdl.Rect{X: 143, Y: 122, W: 456, H: 356})
-		// ctx.Textures.Texture("snow").Copy(renderer, &sdl.Rect{X: 257, Y: 122, W: 456, H: 356})
-		tr.Render(ctx)
 		renderer.Present()
 	}
 	return nil

context.go

@@ -11,6 +11,7 @@ type Context struct {
 	Resources  Resources
 	Textures   Textures
 	Settings   Settings
+	ShouldQuit bool
 }
 
 func NewContext(res *rice.Box) (*Context, error) {
@@ -26,15 +27,17 @@ func NewContext(res *rice.Box) (*Context, error) {
 	return ctx, nil
 }
 
-func (c *Context) Init(renderer *sdl.Renderer) {
-	c.Renderer = renderer
-	c.Fonts.Init(c.Resources.Copy())
-	c.Textures.Init(renderer, c.Resources.Copy())
-}
-
 func (c *Context) Destroy() {
 	c.Fonts.Destroy()
 	c.Resources.Destroy()
 	c.Textures.Destroy()
 	c.Settings.Store()
 }
+
+func (c *Context) Init(renderer *sdl.Renderer) {
+	c.Renderer = renderer
+	c.Fonts.Init(c.Resources.Copy())
+	c.Textures.Init(renderer, c.Resources.Copy())
+}
+
+func (c *Context) Quit() { c.ShouldQuit = true }

game.go

@@ -13,33 +13,69 @@ type Game struct {
 }
 
 type Map struct {
-	Temp  *NoiseMap
+	Temp    NoiseMap
-	Humid *NoiseMap
+	Humid   NoiseMap
+	Variant NoiseMap
+	PlaceX  NoiseMap // displacement map of props
+	PlaceY  NoiseMap
 }
 
-type NoiseMap struct {
+type NoiseMap interface {
+	Value(x, y int32) float64
+}
+
+func NewNoiseMap(seed int64) NoiseMap {
+	return &noiseMap{
+		noise:     noise.NewPerlin(seed),
+		alpha:     2,
+		beta:      4,
+		harmonics: 2,
+	}
+}
+
+func NewRandomNoiseMap(seed int64) NoiseMap {
+	return &randomNoiseMap{noise.NewPerlin(seed)}
+}
+
+type noiseMap struct {
 	noise       *noise.Perlin
 	alpha, beta float64
 	harmonics   int
 }
 
-func NewNoiseMap(seed int64) *NoiseMap {
+func clipNormalized(x float64) float64 {
-	return &NoiseMap{
+	if x < 0 {
-		noise:     noise.NewPerlin(seed),
+		return 0
-		alpha:     2,
-		beta:      2.13,
-		harmonics: 4,
 	}
+	if x > 1 {
+		return 1
+	}
+	return x
 }
 
-func (m *NoiseMap) Value(x, y int) float64 {
+// Value generates the noise value for an x/y pair. The range of the output is approximately [-1.325825214,1.325825214] (for 4 harmonics).
-	return m.noise.Noise2D(float64(x), float64(y), m.alpha, m.beta, m.harmonics)
+func (m *noiseMap) Value(x, y int32) float64 {
+	value := m.noise.Noise2D(float64(x)*.01, float64(y)*.01, m.alpha, m.beta, m.harmonics)*.565 + .5
+	return clipNormalized(value)
+}
+
+type randomNoiseMap struct {
+	*noise.Perlin
+}
+
+// Value generates the noise value for an x/y pair. The range of the output is approximately [-1.325825214,1.325825214] (for 4 harmonics).
+func (m randomNoiseMap) Value(x, y int32) float64 {
+	value := m.Noise2D(float64(x)*.53, float64(y)*.53, 1.01, 2, 2)*.5 + .5
+	return clipNormalized(value)
 }
 
 func NewGame() *Game {
 	terrain := &Map{
 		Temp:    NewNoiseMap(rand.Int63()),
 		Humid:   NewNoiseMap(rand.Int63()),
+		Variant: NewRandomNoiseMap(rand.Int63()),
+		PlaceX:  NewRandomNoiseMap(rand.Int63()),
+		PlaceY:  NewRandomNoiseMap(rand.Int63()),
 	}
 	return &Game{
 		Terrain: terrain,
@@ -48,10 +84,6 @@ func NewGame() *Game {
 	}
 }
 
-type PointF struct {
-	X, Y float32
-}
-
 type Flower struct {
 	Location PointF
 }

point.go

@@ -1,6 +1,18 @@
 package tins2020
 
 type Point struct {
-	X int32
+	X, Y int32
-	Y int32
 }
+
+func (p Point) Add(q Point) Point { return Pt(p.X+q.X, p.Y+q.Y) }
+
+type PointF struct {
+	X, Y float32
+}
+
+func (p PointF) Add(q PointF) PointF { return PtF(p.X+q.X, p.Y+q.Y) }
+
+func (p PointF) Sub(q PointF) PointF { return PtF(p.X-q.X, p.Y-q.Y) }
+
+func Pt(x, y int32) Point     { return Point{x, y} }
+func PtF(x, y float32) PointF { return PointF{x, y} }

renderer.go

@@ -0,0 +1,9 @@
+package tins2020
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type Control interface {
+	Init(*Context) error
+	Handle(*Context, sdl.Event)
+	Render(*Context)
+}

terrainrenderer.go

@@ -0,0 +1,225 @@
+package tins2020
+
+import (
+	"fmt"
+	"log"
+
+	"opslag.de/schobers/geom"
+
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+type terrainRenderer struct {
+	terrain *Map
+	hover   PointF
+	project projection
+
+	interact interaction
+}
+
+type interaction struct {
+	mousePos      Point
+	mouseLeftDown bool
+	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()}
+}
+
+func (r *terrainRenderer) Init(ctx *Context) error {
+	r.project.update(ctx.Renderer)
+	return nil
+}
+
+func (r *terrainRenderer) Handle(ctx *Context, event sdl.Event) {
+	switch e := event.(type) {
+	case *sdl.MouseButtonEvent:
+		if e.Button == sdl.BUTTON_LEFT {
+			r.interact.mouseLeftDown = e.Type == sdl.MOUSEBUTTONDOWN
+			if r.interact.mouseLeftDown && r.interact.mouseDrag == nil {
+				r.interact.mouseDrag = &Point{e.X, e.Y}
+				fmt.Println("Drag start", r.interact.mouseDrag)
+			} else if !r.interact.mouseLeftDown && r.interact.mouseDrag != nil {
+				fmt.Println("Drag end", r.interact.mouseDrag)
+				r.interact.mouseDrag = nil
+			}
+		}
+	case *sdl.MouseMotionEvent:
+		r.hover = r.project.screenToMap(e.X, e.Y)
+		if r.interact.mouseDrag != nil {
+			fmt.Println("Dragging...", r.project.center)
+			r.project.center = r.project.center.Sub(r.project.screenToMapRel(e.X-r.interact.mouseDrag.X, e.Y-r.interact.mouseDrag.Y))
+			r.project.update(ctx.Renderer)
+			r.interact.mouseDrag = &Point{e.X, e.Y}
+		}
+	case *sdl.MouseWheelEvent:
+		if e.Y > 0 {
+			r.project.zoom *= .5
+			r.project.update(ctx.Renderer)
+		} else if e.Y < 0 {
+			r.project.zoom *= 2
+			r.project.update(ctx.Renderer)
+		}
+	case *sdl.WindowEvent:
+		if e.Event == sdl.WINDOWEVENT_RESIZED {
+			r.project.update(ctx.Renderer)
+		}
+	}
+}
+
+func (r *terrainRenderer) Render(ctx *Context) {
+	toTileTexture := func(temp, humid float64) *Texture {
+		if temp < .35 {
+			return ctx.Textures.Texture("tile-snow")
+		}
+		if temp > .65 {
+			return ctx.Textures.Texture("tile-dirt")
+		}
+		return ctx.Textures.Texture("tile-grass")
+	}
+
+	variantToInt := func(variant float64) int {
+		if variant < .25 {
+			return 1
+		}
+		if variant < .5 {
+			return 2
+		}
+		if variant < .75 {
+			return 3
+		}
+		if variant < 1 {
+			return 4
+		}
+		return -1
+	}
+
+	variantToTexture := func(format string, variant float64) *Texture {
+		textName := fmt.Sprintf(format, variantToInt(variant))
+		return ctx.Textures.Texture(textName)
+	}
+
+	stretch := func(x, from, to float64) float64 { return (x - from) * 1 / (to - from) }
+
+	toPropTexture := func(temp, humid, variant float64) *Texture {
+		if temp < .35 {
+			if humid < .2 {
+				return nil
+			} else if humid < .7 {
+				return variantToTexture("bush-small-%d", variant*5)
+			}
+			return variantToTexture("tree-pine-%d", variant*5)
+		}
+		if temp > .65 {
+			if humid < .2 {
+				return nil
+			}
+			if humid < .7 {
+				return variantToTexture("cactus-short-%d", variant*7)
+			}
+			return variantToTexture("cactus-tall-%d", variant*2)
+		}
+		if humid < .2 {
+			return nil
+		}
+		multiplier := 1 - stretch(humid, 0.2, 1)
+		if variant < .5 {
+			return variantToTexture("tree-fat-%d", stretch(variant, 0, .5)*multiplier*3)
+		} else if variant < .8 {
+			return variantToTexture("grass-small-%d", stretch(variant, .5, .8)*multiplier*2)
+		}
+		return variantToTexture("bush-large-%d", stretch(variant, .8, 1)*multiplier)
+	}
+
+	// horizontal: [191, 321) = 130
+	// 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++ {
+		for x := int32(-100); x < 100; x++ {
+			if x == hover.X && y == hover.Y {
+				continue
+			}
+			temp := r.terrain.Temp.Value(x, y)
+			humid := r.terrain.Humid.Value(x, y)
+			text := toTileTexture(temp, humid)
+			pos := r.project.mapToScreen(x, y)
+			text.Copy(ctx.Renderer, r.project.screenToTileRect(pos))
+		}
+	}
+
+	for y := int32(-100); y < 100; y++ {
+		for x := int32(-100); x < 100; x++ {
+			variant := r.terrain.Variant.Value(x, y)
+			if variant < -1 || variant > 1 {
+				continue
+			}
+
+			temp := r.terrain.Temp.Value(x, y)
+			humid := r.terrain.Humid.Value(x, y)
+			text := toPropTexture(temp, humid, variant)
+			if text == nil {
+				continue
+			}
+
+			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))
+
+			text.Copy(ctx.Renderer, r.project.screenToTileRect(pos))
+		}
+	}
+}