Added tool to color image.

Separated some image related methods.
Added feedback for simulation speed (colored buttons).

animation.go

@@ -0,0 +1,56 @@
+package tins2020
+
+import "time"
+
+type Animation struct {
+	active     bool
+	start      time.Time
+	interval   time.Duration
+	lastUpdate time.Duration
+}
+
+func NewAnimation(interval time.Duration) Animation {
+	return Animation{
+		active:   true,
+		start:    time.Now(),
+		interval: interval,
+	}
+}
+
+func NewAnimationPtr(interval time.Duration) *Animation {
+	ani := NewAnimation(interval)
+	return &ani
+}
+
+func (a *Animation) Animate() bool {
+	since := time.Since(a.start)
+	if !a.active || since < a.lastUpdate+a.interval {
+		return false
+	}
+	a.lastUpdate += a.interval
+	return true
+}
+
+func (a *Animation) AnimateFn(fn func()) {
+	since := time.Since(a.start)
+	for a.active && since > a.lastUpdate+a.interval {
+		fn()
+		a.lastUpdate += a.interval
+	}
+}
+
+func (a *Animation) Pause() {
+	a.active = false
+}
+
+func (a *Animation) Run() {
+	if a.active {
+		return
+	}
+	a.active = true
+	a.start = time.Now()
+}
+
+func (a *Animation) SetInterval(interval time.Duration) {
+	a.interval = interval
+}

buttonbar.go

@@ -0,0 +1,57 @@
+package tins2020
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type ButtonBar struct {
+	Container
+
+	Background  sdl.Color
+	Orientation Orientation
+	Buttons     []Control
+}
+
+const buttonBarWidth = 96
+
+func (b *ButtonBar) Init(ctx *Context) error {
+	for i := range b.Buttons {
+		b.AddChild(b.Buttons[i])
+	}
+	return b.Container.Init(ctx)
+}
+
+func (b *ButtonBar) Arrange(ctx *Context, bounds Rectangle) {
+	b.Container.Arrange(ctx, bounds)
+	switch b.Orientation {
+	case OrientationHorizontal:
+		length := bounds.H
+		offset := bounds.X
+		for i := range b.Buttons {
+			b.Buttons[i].Arrange(ctx, RectSize(offset, bounds.Y, length, length))
+			offset += length
+		}
+	default:
+		length := bounds.W
+		offset := bounds.Y
+		for i := range b.Buttons {
+			b.Buttons[i].Arrange(ctx, RectSize(bounds.X, offset, length, length))
+			offset += length
+		}
+	}
+}
+
+func (b *ButtonBar) Handle(ctx *Context, event sdl.Event) {
+	b.Container.Handle(ctx, event)
+}
+
+func (b *ButtonBar) Render(ctx *Context) {
+	ctx.Renderer.SetDrawColor(b.Background.R, b.Background.G, b.Background.B, b.Background.A)
+	ctx.Renderer.FillRect(b.Bounds.SDLPtr())
+	b.Container.Render(ctx)
+}
+
+type Orientation int
+
+const (
+	OrientationVertical Orientation = iota
+	OrientationHorizontal
+)

buyflowerbutton.go

@@ -0,0 +1,95 @@
+package tins2020
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+type BuyFlowerButton struct {
+	IconButton
+
+	Name        string
+	Price       int
+	Description string
+
+	hoverAnimation *Animation
+	hoverOffset    int32
+	hoverTexture   *Texture
+	priceTexture   *Texture
+}
+
+func NewBuyFlowerButton(icon, iconDisabled, name string, price int, description string, isDisabled bool, onClick EventFn) *BuyFlowerButton {
+	return &BuyFlowerButton{
+		IconButton: *NewIconButtonConfig(icon, onClick, func(b *IconButton) {
+			b.IconDisabled = iconDisabled
+			b.IsDisabled = isDisabled
+		}),
+		Name:        name,
+		Price:       price,
+		Description: description,
+	}
+}
+
+func (b *BuyFlowerButton) animate() {
+	b.hoverOffset++
+	if b.hoverOffset > b.hoverTexture.Size().X+b.Bounds.W {
+		b.hoverOffset = b.priceTexture.Size().X
+	}
+}
+
+func (b *BuyFlowerButton) Init(ctx *Context) error {
+	text := fmt.Sprintf("%s - %s - %s", FmtMoney(b.Price), b.Name, b.Description)
+	font := ctx.Fonts.Font("small")
+	color := MustHexColor("#ffffff")
+	texture, err := font.Render(ctx.Renderer, text, color)
+	if err != nil {
+		return err
+	}
+	b.hoverTexture = texture
+	texture, err = font.Render(ctx.Renderer, FmtMoney(b.Price), color)
+	if err != nil {
+		return err
+	}
+	b.priceTexture = texture
+	return nil
+}
+
+func (b *BuyFlowerButton) Handle(ctx *Context, event sdl.Event) {
+	b.IconButton.Handle(ctx, event)
+	if b.IsMouseOver && b.hoverAnimation == nil {
+		b.hoverAnimation = NewAnimationPtr(10 * time.Millisecond)
+		b.hoverOffset = b.priceTexture.Size().X
+	} else if !b.IsMouseOver {
+		b.hoverAnimation = nil
+	}
+}
+
+func (b *BuyFlowerButton) Render(ctx *Context) {
+	iconTexture := b.activeTexture(ctx)
+	mouseOverTexture := ctx.Textures.Texture("control-hover")
+
+	pos := Pt(b.Bounds.X, b.Bounds.Y)
+	iconTexture.CopyResize(ctx.Renderer, RectSize(pos.X, pos.Y-40, buttonBarWidth, 120))
+	if b.IsMouseOver && !b.IsDisabled {
+		mouseOverTexture.Copy(ctx.Renderer, pos)
+	}
+
+	if b.hoverAnimation != nil {
+		b.hoverAnimation.AnimateFn(b.animate)
+	}
+
+	if b.IsMouseOver {
+		left := buttonBarWidth - 8 - b.hoverOffset
+		top := pos.Y + buttonBarWidth - 20
+		if left < 0 {
+			part := Rect(-left, 0, b.hoverTexture.Size().X, b.hoverTexture.Size().Y)
+			b.hoverTexture.CopyPart(ctx.Renderer, part, Pt(pos.X, top))
+		} else {
+			b.hoverTexture.Copy(ctx.Renderer, Pt(pos.X+left, top))
+		}
+	} else {
+		b.priceTexture.Copy(ctx.Renderer, Pt(pos.X+buttonBarWidth-8-b.priceTexture.Size().X, pos.Y+buttonBarWidth-20))
+	}
+}

cmd/imadapt/color.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"image"
+	"image/color"
+
+	"opslag.de/schobers/tins2020/img"
+)
+
+func colorImage(path string, col color.Color) error {
+	src, err := img.DecodeImage(path)
+	if err != nil {
+		return err
+	}
+
+	colNRGBA := color.NRGBAModel.Convert(col).(color.NRGBA)
+	bounds := src.Bounds()
+	dst := image.NewRGBA(bounds)
+	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+		for x := bounds.Min.X; x < bounds.Max.X; x++ {
+			c := src.At(x, y)
+			srcCol := color.NRGBAModel.Convert(c).(color.NRGBA)
+			if srcCol.A > 0 {
+				dstCol := colNRGBA
+				dstCol.A = srcCol.A
+				dst.Set(x, y, dstCol)
+			} else {
+				dst.Set(x, y, c)
+			}
+		}
+	}
+	return img.EncodePNG(path, dst)
+	return nil
+}

cmd/imadapt/crop.go

@@ -5,10 +5,11 @@ import (
 	"image/draw"
 
 	"github.com/nfnt/resize"
+	"opslag.de/schobers/tins2020/img"
 )
 
 func crop(path string, crop rect, size *point) error {
-	src, err := decodeImage(path)
+	src, err := img.DecodeImage(path)
 	if err != nil {
 		return err
 	}
@@ -17,9 +18,9 @@ func crop(path string, crop rect, size *point) error {
 	dst := image.NewRGBA(dstRect)
 	draw.Draw(dst, dstRect, src, srcRect.Min, draw.Src)
 	if size == nil {
-		return encodePNG(path, dst)
+		return img.EncodePNG(path, dst)
 	}
 
 	resized := resize.Resize(uint(size.x), uint(size.y), dst, resize.Bilinear)
-	return encodePNG(path, resized)
+	return img.EncodePNG(path, resized)
 }

cmd/imadapt/gray.go

@@ -3,10 +3,12 @@ package main
 import (
 	"image"
 	"image/color"
+
+	"opslag.de/schobers/tins2020/img"
 )
 
 func convertToGray(path string) error {
-	src, err := decodeImage(path)
+	src, err := img.DecodeImage(path)
 	if err != nil {
 		return err
 	}
@@ -25,5 +27,5 @@ func convertToGray(path string) error {
 			}
 		}
 	}
-	return encodePNG(path, dst)
+	return img.EncodePNG(path, dst)
 }

cmd/imadapt/imadapt.go

@@ -5,6 +5,8 @@ import (
 	"flag"
 	"fmt"
 	"log"
+
+	"opslag.de/schobers/tins2020/img"
 )
 
 func run() error {
@@ -73,6 +75,17 @@ func run() error {
 				return fmt.Errorf("couldn't crop '%s'; error: %v", path, err)
 			}
 		}
+	case "color":
+		flags := flag.NewFlagSet("color", flag.ContinueOnError)
+		var col string
+		flags.StringVar(&col, "color", "#ff0000", "target color")
+		flags.Parse(args[1:])
+		for _, path := range flags.Args() {
+			err := colorImage(path, img.MustHexColor(col))
+			if err != nil {
+				return fmt.Errorf("couldn't convert to grayscale of '%s'; error: %v", path, err)
+			}
+		}
 	}
 	return nil
 }

cmd/imadapt/setalpha.go

@@ -3,10 +3,12 @@ package main
 import (
 	"image"
 	"image/color"
+
+	"opslag.de/schobers/tins2020/img"
 )
 
 func setAlpha(path string, alpha int) error {
-	src, err := decodeImage(path)
+	src, err := img.DecodeImage(path)
 	if err != nil {
 		return err
 	}
@@ -21,5 +23,5 @@ func setAlpha(path string, alpha int) error {
 			dst.Set(x, y, c)
 		}
 	}
-	return encodePNG(path, dst)
+	return img.EncodePNG(path, dst)
 }

cmd/tins2020/res/textures.txt

@@ -1,4 +1,18 @@
-game-control-hover: images/game_control_hover.png
+control-hover: images/game_control_hover.png
+control-shovel: images/genericItem_color_022.png
+control-research: images/genericItem_color_111.png
+
+control-settings: images/gear.png
+control-save: images/save.png
+control-load: images/basket.png
+control-quit: images/power.png
+
+control-pause: images/pause.png
+control-pause-disabled: images/pause_disabled.png
+control-run: images/forward.png
+control-run-disabled: images/forward_disabled.png
+control-run-fast: images/fastForward.png
+control-run-fast-disabled: images/fastForward_disabled.png
 
 tile-dirt: images/tile_dirt.png
 tile-grass: images/tile_grass.png

cmd/tins2020/tins2020.go

@@ -42,16 +42,10 @@ func run() error {
 	defer ctx.Destroy()
 
 	if ctx.Settings.Window.Location == nil {
-		ctx.Settings.Window.Location = &tins2020.Point{
-			X: sdl.WINDOWPOS_UNDEFINED,
-			Y: sdl.WINDOWPOS_UNDEFINED,
-		}
+		ctx.Settings.Window.Location = tins2020.PtPtr(sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED)
 	}
 	if ctx.Settings.Window.Size == nil {
-		ctx.Settings.Window.Size = &tins2020.Point{
-			X: 800,
-			Y: 600,
-		}
+		ctx.Settings.Window.Size = tins2020.PtPtr(800, 600)
 	}
 
 	sdl.SetHint(sdl.HINT_RENDER_SCALE_QUALITY, "1")
@@ -73,8 +67,10 @@ func run() error {
 	ctx.Init(renderer)
 
 	err = ctx.Fonts.LoadDesc(
-		tins2020.FontDescriptor{Name: "debug", Path: "fonts/OpenSans-Regular.ttf", Size: 12},
-		tins2020.FontDescriptor{Name: "default", Path: "fonts/FiraMono-Regular.ttf", Size: 10},
+		tins2020.FontDescriptor{Name: "debug", Path: "fonts/FiraMono-Regular.ttf", Size: 12},
+		tins2020.FontDescriptor{Name: "default", Path: "fonts/OpenSans-Regular.ttf", Size: 16},
+		tins2020.FontDescriptor{Name: "small", Path: "fonts/OpenSans-Regular.ttf", Size: 12},
+		tins2020.FontDescriptor{Name: "balance", Path: "fonts/OpenSans-Bold.ttf", Size: 40},
 	)
 	if err != nil {
 		return err
@@ -91,7 +87,7 @@ func run() error {
 
 	app := tins2020.NewContainer()
 	overlays := tins2020.NewContainer()
-	gameControls := tins2020.NewGameControls()
+	gameControls := tins2020.NewGameControls(game)
 	overlays.AddChild(gameControls)
 	overlays.AddChild(&tins2020.FPS{})
 	content := tins2020.NewContainer()
@@ -103,6 +99,9 @@ func run() error {
 		return err
 	}
 
+	w, h := window.GetSize()
+	app.Arrange(ctx, tins2020.Rect(0, 0, w, h))
+
 	for {
 		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
 			switch e := event.(type) {
@@ -113,10 +112,11 @@ func run() error {
 				switch e.Event {
 				case sdl.WINDOWEVENT_MOVED:
 					x, y := window.GetPosition()
-					ctx.Settings.Window.Location = &tins2020.Point{X: x, Y: y}
+					ctx.Settings.Window.Location = tins2020.PtPtr(x, y)
 				case sdl.WINDOWEVENT_SIZE_CHANGED:
 					w, h := window.GetSize()
-					ctx.Settings.Window.Size = &tins2020.Point{X: w, Y: h}
+					app.Arrange(ctx, tins2020.Rect(0, 0, w, h))
+					ctx.Settings.Window.Size = tins2020.PtPtr(w, h)
 				}
 			case *sdl.KeyboardEvent:
 				switch e.Keysym.Sym {

color.go

@@ -1,55 +1,9 @@
 package tins2020
 
 import (
-	"errors"
-	"regexp"
+	"opslag.de/schobers/tins2020/img"
 
 	"github.com/veandco/go-sdl2/sdl"
 )
 
-var hexColorRE = regexp.MustCompile(`^#?([0-9A-Fa-f]{2})-?([0-9A-Fa-f]{2})-?([0-9A-Fa-f]{2})-?([0-9A-Fa-f]{2})?$`)
-
-func HexColor(s string) (sdl.Color, error) {
-	match := hexColorRE.FindStringSubmatch(s)
-	if match == nil {
-		return sdl.Color{}, errors.New("invalid color format")
-	}
-	values, err := HexToInts(match[1:]...)
-	if err != nil {
-		return sdl.Color{}, err
-	}
-	a := 255
-	if len(match[4]) > 0 {
-		a = values[3]
-	}
-	return sdl.Color{R: uint8(values[0]), G: uint8(values[1]), B: uint8(values[2]), A: uint8(a)}, nil
-}
-
-func HexToInt(s string) (int, error) {
-	var i int
-	for _, c := range s {
-		i *= 16
-		if c >= '0' && c <= '9' {
-			i += int(c - '0')
-		} else if c >= 'A' && c <= 'F' {
-			i += int(c - 'A' + 10)
-		} else if c >= 'a' && c <= 'f' {
-			i += int(c - 'a' + 10)
-		} else {
-			return 0, errors.New("hex digit not supported")
-		}
-	}
-	return i, nil
-}
-
-func HexToInts(s ...string) ([]int, error) {
-	ints := make([]int, len(s))
-	for i, s := range s {
-		value, err := HexToInt(s)
-		if err != nil {
-			return nil, err
-		}
-		ints[i] = value
-	}
-	return ints, nil
-}
+func MustHexColor(s string) sdl.Color { return sdl.Color(img.MustHexColor(s)) }

container.go

@@ -5,6 +5,8 @@ import (
 )
 
 type Container struct {
+	ControlBase
+
 	Children []Control
 }
 
@@ -16,19 +18,23 @@ func (c *Container) AddChild(child Control) {
 	c.Children = append(c.Children, child)
 }
 
+func (c *Container) Arrange(ctx *Context, bounds Rectangle) {
+	c.ControlBase.Arrange(ctx, bounds)
+	for _, child := range c.Children {
+		child.Arrange(ctx, bounds)
+	}
+}
+
 func (c *Container) Handle(ctx *Context, event sdl.Event) {
+	c.ControlBase.Handle(ctx, event)
 	for _, child := range c.Children {
 		child.Handle(ctx, event)
 	}
 }
 
-func (c *Container) Render(ctx *Context) {
-	for _, child := range c.Children {
-		child.Render(ctx)
-	}
-}
-
 func (c *Container) Init(ctx *Context) error {
+	c.ControlBase.Init(ctx)
+
 	for _, child := range c.Children {
 		err := child.Init(ctx)
 		if err != nil {
@@ -37,3 +43,11 @@ func (c *Container) Init(ctx *Context) error {
 	}
 	return nil
 }
+
+func (c *Container) Render(ctx *Context) {
+	c.ControlBase.Render(ctx)
+
+	for _, child := range c.Children {
+		child.Render(ctx)
+	}
+}

control.go

@@ -4,15 +4,47 @@ import "github.com/veandco/go-sdl2/sdl"
 
 type Control interface {
 	Init(*Context) error
+	Arrange(*Context, Rectangle)
 	Handle(*Context, sdl.Event)
 	Render(*Context)
 }
 
-type ControlBase struct {
+type EventFn func(*Context)
+
+type EmptyEventFn func()
+
+func EmptyEvent(fn EmptyEventFn) EventFn {
+	return func(*Context) { fn() }
 }
 
-func (b *ControlBase) Handle(*Context, sdl.Event) {}
+type ControlBase struct {
+	Bounds Rectangle
 
-func (b *ControlBase) Render(*Context) {}
+	IsMouseOver bool
+
+	OnLeftMouseButtonClick EventFn
+}
+
+func (b *ControlBase) Arrange(ctx *Context, bounds Rectangle) { b.Bounds = bounds }
 
 func (b *ControlBase) Init(*Context) error { return nil }
+
+func (b *ControlBase) Handle(ctx *Context, event sdl.Event) {
+	switch e := event.(type) {
+	case *sdl.MouseMotionEvent:
+		b.IsMouseOver = b.Bounds.IsPointInside(e.X, e.Y)
+	case *sdl.MouseButtonEvent:
+		if b.IsMouseOver && e.Button == sdl.BUTTON_LEFT && e.Type == sdl.MOUSEBUTTONDOWN {
+			b.Invoke(ctx, b.OnLeftMouseButtonClick)
+		}
+	}
+}
+
+func (b *ControlBase) Invoke(ctx *Context, fn EventFn) {
+	if fn == nil {
+		return
+	}
+	fn(ctx)
+}
+
+func (b *ControlBase) Render(*Context) {}

flower.go

@@ -34,13 +34,14 @@ type FlowerResistance struct {
 // NewPoppyTraits creates the traits of a poppy, a very generic flower that thrives in a moderate climate.
 func NewPoppyTraits() FlowerTraits {
 	return FlowerTraits{
-		Spread: 0.0007,
-		Life:   0.99991,
+		// Spread: 0.0011,
+		Spread: 0.0011,
+		Life:   0.99993,
 		Resistance: FlowerResistance{
-			Cold: 0.3,
-			Hot:  0.3,
-			Dry:  0.3,
-			Wet:  0.3,
+			Cold: 0.5,
+			Hot:  0.5,
+			Dry:  0.5,
+			Wet:  0.5,
 		},
 	}
 }

fonts.go

@@ -20,7 +20,7 @@ type Font struct {
 	*ttf.Font
 }
 
-func (f *Font) Render(renderer *sdl.Renderer, text string, pos Point, color sdl.Color) (*Texture, error) {
+func (f *Font) Render(renderer *sdl.Renderer, text string, color sdl.Color) (*Texture, error) {
 	surface, err := f.RenderUTF8Blended(text, color)
 	if err != nil {
 		return nil, err
@@ -34,31 +34,25 @@ func (f *Font) Render(renderer *sdl.Renderer, text string, pos Point, color sdl.
 }
 
 func (f *Font) RenderCopyAlign(renderer *sdl.Renderer, text string, pos Point, color sdl.Color, align TextAlignment) error {
-	texture, err := f.Render(renderer, text, pos, color)
+	texture, err := f.Render(renderer, text, color)
 	if err != nil {
 		return err
 	}
 	defer texture.Destroy()
-	rect := texture.Rect()
+	size := texture.Size()
 	switch align {
 	case TextAlignmentLeft:
-		texture.Copy(renderer, &sdl.Rect{X: pos.X, Y: pos.Y, W: rect.W, H: rect.H})
+		texture.Copy(renderer, Pt(pos.X, pos.Y-size.Y))
 	case TextAlignmentCenter:
-		texture.Copy(renderer, &sdl.Rect{X: pos.X - (rect.W / 2), Y: pos.Y, W: rect.W, H: rect.H})
+		texture.Copy(renderer, Pt(pos.X-(size.X/2), pos.Y-size.Y))
 	case TextAlignmentRight:
-		texture.Copy(renderer, &sdl.Rect{X: pos.X - rect.W, Y: pos.Y, W: rect.W, H: rect.H})
+		texture.Copy(renderer, Pt(pos.X-size.X, pos.Y-size.Y))
 	}
 	return nil
 }
 
 func (f *Font) RenderCopy(renderer *sdl.Renderer, text string, pos Point, color sdl.Color) error {
-	texture, err := f.Render(renderer, text, pos, color)
-	if err != nil {
-		return err
-	}
-	defer texture.Destroy()
-	texture.Copy(renderer, texture.RectOffset(pos))
-	return nil
+	return f.RenderCopyAlign(renderer, text, pos, color, TextAlignmentLeft)
 }
 
 type Fonts struct {

fpsrenderer.go

@@ -37,5 +37,5 @@ func (f *FPS) Render(ctx *Context) {
 	f.ticks[f.slot]++
 
 	font := ctx.Fonts.Font("debug")
-	font.RenderCopy(ctx.Renderer, fmt.Sprintf("FPS: %d", f.total), Pt(5, 5), sdl.Color{R: 255, G: 255, B: 255, A: 255})
+	font.RenderCopy(ctx.Renderer, fmt.Sprintf("FPS: %d", f.total), Pt(5, 17), sdl.Color{R: 255, G: 255, B: 255, A: 255})
 }

game.go

@@ -6,13 +6,21 @@ import (
 )
 
 type Game struct {
-	Money   int
+	Balance int
+	Speed   GameSpeed
 	Terrain *Map
 
-	start      time.Time
-	lastUpdate time.Duration
+	simulation Animation
 }
 
+type GameSpeed string
+
+const (
+	GameSpeedNormal GameSpeed = "normal"
+	GameSpeedFast             = "fast"
+	GameSpeedPaused           = "paused"
+)
+
 type Map struct {
 	Temp    NoiseMap
 	Humid   NoiseMap
@@ -36,6 +44,9 @@ func (m *Map) NewFlower(pos Point, traits FlowerTraits) Flower {
 	return flower
 }
 
+const simulationInterval = 120 * time.Millisecond
+const fastSimulationInterval = 40 * time.Millisecond
+
 func NewGame() *Game {
 	terrain := &Map{
 		Temp:    NewNoiseMap(rand.Int63()),
@@ -47,18 +58,11 @@ func NewGame() *Game {
 	}
 	terrain.AddFlower(Pt(0, 0), NewPoppyTraits())
 	return &Game{
-		Money:   100,
+		Speed:   GameSpeedNormal,
+		Balance: 100,
 		Terrain: terrain,
 
-		start: time.Now(),
-	}
-}
-
-func (g *Game) Update() {
-	update := time.Since(g.start)
-	for g.lastUpdate < update {
-		g.tick()
-		g.lastUpdate += time.Millisecond * 10
+		simulation: NewAnimation(time.Millisecond * 10),
 	}
 }
 
@@ -92,3 +96,26 @@ func (g *Game) tick() {
 	}
 	g.Terrain.Flowers = flowers
 }
+
+func (g *Game) Pause() {
+	g.Speed = GameSpeedPaused
+	g.simulation.Pause()
+}
+
+func (g *Game) Run() {
+	g.Speed = GameSpeedNormal
+	g.simulation.SetInterval(simulationInterval)
+	g.simulation.Run()
+}
+
+func (g *Game) RunFast() {
+	g.Speed = GameSpeedFast
+	g.simulation.SetInterval(fastSimulationInterval)
+	g.simulation.Run()
+}
+
+func (g *Game) Update() {
+	for g.simulation.Animate() {
+		g.tick()
+	}
+}

gamecontrols.go

@@ -1,113 +1,90 @@
 package tins2020
 
-import (
-	"log"
-
-	"github.com/veandco/go-sdl2/sdl"
-)
-
 type GameControls struct {
-	ControlBase
+	Container
+
+	game *Game
 
 	menu    ButtonBar
+	top     ButtonBar
 	flowers ButtonBar
+
+	pause   *IconButton
+	run     *IconButton
+	runFast *IconButton
 }
 
-type ButtonBar struct {
-	Top     int32
-	Left    int32
-	Bottom  int32
-	Hover   int
-	Buttons []Button
+func NewGameControls(game *Game) *GameControls {
+	return &GameControls{game: game}
 }
 
-type Button struct {
-	Icon     string
-	Disabled string
-
-	IsDisabled bool
+func (c *GameControls) updateSpeedControls() {
+	disable := func(b *IconButton, speed GameSpeed) {
+		b.IsDisabled = speed == c.game.Speed
+	}
+	disable(c.pause, GameSpeedPaused)
+	disable(c.run, GameSpeedNormal)
+	disable(c.runFast, GameSpeedFast)
 }
 
-const buttonBarWidth = 96
-
-func (b *ButtonBar) Handle(ctx *Context, event sdl.Event) {
-	switch e := event.(type) {
-	case *sdl.MouseMotionEvent:
-		if e.X > b.Left && e.X < b.Left+buttonBarWidth {
-			button := int(e.Y-b.Top) / buttonBarWidth
-			if button < 0 || button >= len(b.Buttons) || b.Buttons[button].IsDisabled {
-				button = -1
-			}
-			b.Hover = button
-		} else {
-			b.Hover = -1
-		}
-	}
+func (c *GameControls) Arrange(ctx *Context, bounds Rectangle) {
+	c.Bounds = bounds
+	c.menu.Arrange(ctx, RectSize(bounds.X, bounds.Y, buttonBarWidth, bounds.H))
+	c.top.Arrange(ctx, Rect(bounds.X+bounds.W/2+8, bounds.Y, bounds.Right(), bounds.Y+64))
+	c.flowers.Arrange(ctx, RectSize(bounds.Right()-buttonBarWidth, bounds.Y, buttonBarWidth, bounds.H))
 }
 
-func (b *ButtonBar) Render(ctx *Context) {
-	ctx.Renderer.FillRect(&sdl.Rect{X: b.Left, Y: b.Top, W: b.Left + buttonBarWidth, H: b.Bottom})
-	texture := func(b Button) *Texture {
-		if b.IsDisabled {
-			texture := ctx.Textures.Texture(b.Disabled)
-			if texture != nil {
-				return texture
-			}
-		}
-		return ctx.Textures.Texture(b.Icon)
-	}
-	hoverTexture := ctx.Textures.Texture("game-control-hover")
-	for i, button := range b.Buttons {
-		pos := Pt(b.Left, b.Top+int32(i)*buttonBarWidth)
-		texture := texture(button)
-		texture.Copy(ctx.Renderer, &sdl.Rect{X: pos.X, Y: pos.Y - 40, W: buttonBarWidth, H: 120})
-		if b.Hover == i {
-			hoverTexture.Copy(ctx.Renderer, hoverTexture.RectOffset(pos))
-		}
-	}
-}
-
-func NewGameControls() *GameControls {
-	return &GameControls{}
+func (c *GameControls) buyPoppy(ctx *Context) {
+	c.game.Balance -= 10
 }
 
 func (c *GameControls) Init(ctx *Context) error {
-	c.flowers.Hover = -1
-	c.flowers.Buttons = []Button{
-		Button{Icon: "flower-poppy-1", Disabled: "flower-poppy-disabled"},
-		Button{Icon: "flower-red-c-1", Disabled: "flower-red-c-disabled", IsDisabled: true},
-	}
-	return c.updateBarPositions(ctx)
+	c.flowers.Background = MustHexColor("#356dad") // brown alternative? #4ac69a
+	c.flowers.Buttons = []Control{
+		NewBuyFlowerButton("flower-poppy-1", "flower-poppy-disabled", "Poppy", 10, "A very generic flower that thrives in a moderate climate.", false, c.buyPoppy),
+		NewBuyFlowerButton("flower-red-c-1", "flower-poppy-disabled", "Unknown", 100, "Traits are not known yet.", true, nil),
 	}
 
-func (c *GameControls) Handle(ctx *Context, event sdl.Event) {
-	c.menu.Handle(ctx, event)
-	c.flowers.Handle(ctx, event)
+	c.top.Orientation = OrientationHorizontal
+	c.pause = NewIconButtonConfig("control-pause", EmptyEvent(func() {
+		c.game.Pause()
+		c.updateSpeedControls()
+	}), func(b *IconButton) {
+		b.IconDisabled = "control-pause-disabled"
+	})
+	c.run = NewIconButtonConfig("control-run", EmptyEvent(func() {
+		c.game.Run()
+		c.updateSpeedControls()
+	}), func(b *IconButton) {
+		b.IconDisabled = "control-run-disabled"
+	})
+	c.runFast = NewIconButtonConfig("control-run-fast", EmptyEvent(func() {
+		c.game.RunFast()
+		c.updateSpeedControls()
+	}), func(b *IconButton) {
+		b.IconDisabled = "control-run-fast-disabled"
+	})
+	c.updateSpeedControls()
+	c.top.Buttons = []Control{c.pause, c.run, c.runFast}
 
-	switch e := event.(type) {
-	case *sdl.WindowEvent:
-		switch e.Event {
-		case sdl.WINDOWEVENT_RESIZED:
-			err := c.updateBarPositions(ctx)
-			if err != nil {
-				log.Fatal(err)
-			}
-		}
+	c.menu.Background = MustHexColor("#356dad")
+	c.menu.Buttons = []Control{
+		NewIconButton("control-settings", EmptyEvent(func() {})),
+		NewIconButton("control-save", EmptyEvent(func() {})),
+		NewIconButton("control-load", EmptyEvent(func() {})),
 	}
+
+	c.Container.AddChild(&c.menu)
+	c.Container.AddChild(&c.top)
+	c.Container.AddChild(&c.flowers)
+	return c.Container.Init(ctx)
 }
 
 func (c *GameControls) Render(ctx *Context) {
-	ctx.Renderer.SetDrawColor(74, 198, 154, 255)
-	c.menu.Render(ctx)
-	c.flowers.Render(ctx)
-}
+	topBar := MustHexColor("#0000007f")
+	ctx.Renderer.SetDrawColor(topBar.R, topBar.G, topBar.B, topBar.A)
+	ctx.Renderer.FillRect(Rect(c.menu.Bounds.Right(), 0, c.flowers.Bounds.X, 64).SDLPtr())
+	ctx.Fonts.Font("balance").RenderCopyAlign(ctx.Renderer, FmtMoney(c.game.Balance), Pt(c.top.Bounds.X-8, 58), MustHexColor("#4AC69A"), TextAlignmentRight)
 
-func (c *GameControls) updateBarPositions(ctx *Context) error {
-	w, h, err := ctx.Renderer.GetOutputSize()
-	if err != nil {
-		return err
-	}
-	c.menu.Top, c.menu.Left, c.menu.Bottom = 0, 0, h
-	c.flowers.Top, c.flowers.Left, c.flowers.Bottom = 0, w-buttonBarWidth, h
-	return nil
+	c.Container.Render(ctx)
 }

iconbutton.go

@@ -0,0 +1,62 @@
+package tins2020
+
+type IconButton struct {
+	ControlBase
+
+	Icon         string
+	IconDisabled string
+	IconScale    Scale
+	IconWidth    int32
+
+	IsDisabled bool
+}
+
+type Scale int
+
+const (
+	ScaleCenter Scale = iota
+	ScaleStretch
+)
+
+func NewIconButton(icon string, onClick EventFn) *IconButton {
+	return &IconButton{
+		ControlBase: ControlBase{
+			OnLeftMouseButtonClick: onClick,
+		},
+		Icon: icon,
+	}
+}
+
+func NewIconButtonConfig(icon string, onClick EventFn, configure func(*IconButton)) *IconButton {
+	button := NewIconButton(icon, onClick)
+	configure(button)
+	return button
+}
+
+func (b *IconButton) activeTexture(ctx *Context) *Texture {
+	if b.IsDisabled {
+		texture := ctx.Textures.Texture(b.IconDisabled)
+		if texture != nil {
+			return texture
+		}
+	}
+	return ctx.Textures.Texture(b.Icon)
+}
+
+func (b *IconButton) Render(ctx *Context) {
+	iconTexture := b.activeTexture(ctx)
+	mouseOverTexture := ctx.Textures.Texture("control-hover")
+
+	if b.IconScale == ScaleCenter {
+		size := iconTexture.Size()
+		if b.IconWidth != 0 {
+			size = Pt(b.IconWidth, b.IconWidth*size.Y/size.X)
+		}
+		iconTexture.CopyResize(ctx.Renderer, RectSize(b.Bounds.X+(b.Bounds.W-size.X)/2, b.Bounds.Y+(b.Bounds.H-size.Y)/2, size.X, size.Y))
+	} else {
+		iconTexture.CopyResize(ctx.Renderer, b.Bounds)
+	}
+	if b.IsMouseOver && !b.IsDisabled {
+		mouseOverTexture.CopyResize(ctx.Renderer, b.Bounds)
+	}
+}

img/color.go

@@ -0,0 +1,62 @@
+package img
+
+import (
+	"errors"
+	"image/color"
+	"regexp"
+)
+
+var hexColorRE = regexp.MustCompile(`^#?([0-9A-Fa-f]{2})-?([0-9A-Fa-f]{2})-?([0-9A-Fa-f]{2})-?([0-9A-Fa-f]{2})?$`)
+
+func HexColor(s string) (color.RGBA, error) {
+	match := hexColorRE.FindStringSubmatch(s)
+	if match == nil {
+		return color.RGBA{}, errors.New("invalid color format")
+	}
+	values, err := HexToInts(match[1:]...)
+	if err != nil {
+		return color.RGBA{}, err
+	}
+	a := 255
+	if len(match[4]) > 0 {
+		a = values[3]
+	}
+	return color.RGBA{R: uint8(values[0]), G: uint8(values[1]), B: uint8(values[2]), A: uint8(a)}, nil
+}
+
+func MustHexColor(s string) color.RGBA {
+	color, err := HexColor(s)
+	if err != nil {
+		panic(err)
+	}
+	return color
+}
+
+func HexToInt(s string) (int, error) {
+	var i int
+	for _, c := range s {
+		i *= 16
+		if c >= '0' && c <= '9' {
+			i += int(c - '0')
+		} else if c >= 'A' && c <= 'F' {
+			i += int(c - 'A' + 10)
+		} else if c >= 'a' && c <= 'f' {
+			i += int(c - 'a' + 10)
+		} else {
+			return 0, errors.New("hex digit not supported")
+		}
+	}
+	return i, nil
+}
+
+func HexToInts(s ...string) ([]int, error) {
+	ints := make([]int, len(s))
+	for i, s := range s {
+		value, err := HexToInt(s)
+		if err != nil {
+			return nil, err
+		}
+		ints[i] = value
+	}
+	return ints, nil
+}

img/io.go

@@ -1,4 +1,4 @@
-package main
+package img
 
 import (
 	"image"
@@ -6,7 +6,7 @@ import (
 	"os"
 )
 
-func encodePNG(path string, im image.Image) error {
+func EncodePNG(path string, im image.Image) error {
 	dst, err := os.Create(path)
 	if err != nil {
 		return err
@@ -15,7 +15,7 @@ func encodePNG(path string, im image.Image) error {
 	return png.Encode(dst, im)
 }
 
-func decodeImage(path string) (image.Image, error) {
+func DecodeImage(path string) (image.Image, error) {
 	f, err := os.Open(path)
 	if err != nil {
 		return nil, err

math.go

@@ -20,6 +20,13 @@ func Ceil32(x float32) float32 { return float32(math.Ceil(float64(x))) }
 
 func Floor32(x float32) float32 { return float32(math.Floor(float64(x))) }
 
+func Max(a, b int32) int32 {
+	if a > b {
+		return a
+	}
+	return b
+}
+
 func Max32(a, b float32) float32 {
 	if a > b {
 		return a
@@ -27,6 +34,13 @@ func Max32(a, b float32) float32 {
 	return b
 }
 
+func Min(a, b int32) int32 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
 func Min32(a, b float32) float32 {
 	if a < b {
 		return a

money.go

@@ -0,0 +1,5 @@
+package tins2020
+
+import "fmt"
+
+func FmtMoney(amount int) string { return fmt.Sprintf("$ %d", amount) }

point.go

@@ -1,18 +1,40 @@
 package tins2020
 
+import "github.com/veandco/go-sdl2/sdl"
+
 type Point struct {
-	X, Y int32
+	sdl.Point
 }
 
 func (p Point) Add(q Point) Point { return Pt(p.X+q.X, p.Y+q.Y) }
 
+func (p Point) In(r Rectangle) bool { return r.IsPointInsidePt(p) }
+
+func (p Point) ToPtF() PointF { return PtF(float32(p.X), float32(p.Y)) }
+
 type PointF struct {
-	X, Y float32
+	sdl.FPoint
 }
 
-func (p PointF) Add(q PointF) PointF { return PtF(p.X+q.X, p.Y+q.Y) }
+func (p PointF) Add(q PointF) PointF {
+	return PtF(p.X+q.X, p.Y+q.Y)
+}
+
+func (p PointF) Mul(f float32) PointF {
+	return PtF(f*p.X, f*p.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} }
+func Pt(x, y int32) Point     { return Point{sdl.Point{X: x, Y: y}} }
+func PtF(x, y float32) PointF { return PointF{sdl.FPoint{X: x, Y: y}} }
+
+func PtPtr(x, y int32) *Point {
+	p := Pt(x, y)
+	return &p
+}
+
+func PtFPtr(x, y float32) *PointF {
+	p := PtF(x, y)
+	return &p
+}

projection.go

@@ -11,7 +11,8 @@ type projection struct {
 	zoom    float32
 	zoomInv float32
 
-	windowRect         sdl.Rect
+	windowInteractRect Rectangle
+	windowVisibleRect  Rectangle
 	tileScreenDelta    PointF
 	tileScreenDeltaInv PointF
 	tileScreenOffset   Point
@@ -30,7 +31,7 @@ func (p *projection) mapToScreen(x, y int32) Point {
 
 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)*64*p.zoomInv), p.windowCenter.Y+int32((translated.X+translated.Y)*32*p.zoomInv))
+	return Pt(p.windowCenter.X+int32((translated.X-translated.Y)*64*p.zoom), p.windowCenter.Y+int32((translated.X+translated.Y)*32*p.zoom))
 }
 
 func (p *projection) screenToMap(x, y int32) PointF {
@@ -39,49 +40,51 @@ func (p *projection) screenToMap(x, y int32) PointF {
 }
 
 func (p *projection) screenToMapRel(x, y int32) PointF {
-	normX := p.zoom * float32(x)
-	normY := p.zoom * float32(y)
+	normX := p.zoomInv * float32(x)
+	normY := p.zoomInv * 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) screenToTileFitRect(pos Point) Rectangle {
+	return RectSize(pos.X-p.tileFitScreenSize.X, pos.Y-p.tileFitScreenSize.Y, 2*p.tileFitScreenSize.X, 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) screenToTileRect(pos Point) Rectangle {
+	return RectSize(pos.X-p.tileScreenOffset.X, pos.Y-p.tileScreenOffset.Y, p.tileScreenSize.X, p.tileScreenSize.Y)
 }
 
 func (p *projection) update(renderer *sdl.Renderer) {
 	p.zoomInv = 1 / p.zoom
 
-	p.tileScreenOffset = Pt(int32(p.zoomInv*64), int32(p.zoomInv*112))
-	p.tileScreenSize = Pt(int32(p.zoomInv*128), int32(p.zoomInv*160))
-	p.tileFitScreenSize = Pt(int32(p.zoomInv*64), int32(p.zoomInv*32))
+	p.tileScreenOffset = Pt(int32(p.zoom*64), int32(p.zoom*112))
+	p.tileScreenSize = Pt(int32(p.zoom*128), int32(p.zoom*160))
+	p.tileFitScreenSize = Pt(int32(p.zoom*64), int32(p.zoom*32))
 
 	windowW, windowH, err := renderer.GetOutputSize()
 	if err != nil {
 		log.Fatal(err)
 	}
 	p.windowCenter = Pt(windowW/2, windowH/2)
-	p.windowRect = sdl.Rect{X: buttonBarWidth, Y: 0, W: windowW - 2*buttonBarWidth, H: windowH - 0}
+	p.windowInteractRect = Rect(buttonBarWidth, 64, windowW-buttonBarWidth, windowH)
+	p.windowVisibleRect = Rect(buttonBarWidth, 0, windowW-buttonBarWidth, windowH+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(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)
+	visible := p.windowVisibleRect
+	topLeft := p.screenToMap(visible.X, visible.Y)
+	topRight := p.screenToMap(visible.X+visible.W, visible.Y)
+	bottomLeft := p.screenToMap(visible.X, visible.Y+visible.H)
+	bottomRight := p.screenToMap(visible.X+visible.W, visible.Y+visible.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 {
+			if rectFit.X+rectFit.W < visible.X || rectFit.Y+rectFit.H < visible.Y {
 				continue
 			}
-			if rectFit.X > p.windowRect.X+p.windowRect.W || rectFit.Y > p.windowRect.Y+p.windowRect.H {
+			if rectFit.X > visible.X+visible.W || rectFit.Y > visible.Y+visible.H {
 				break
 			}
 			action(x, y, pos)

rect.go

@@ -0,0 +1,32 @@
+package tins2020
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type Rectangle struct {
+	sdl.Rect
+}
+
+func Rect(x1, y1, x2, y2 int32) Rectangle {
+	if x1 > x2 {
+		x1, x2 = x2, x1
+	}
+	if y1 > y2 {
+		y1, y2 = y2, y1
+	}
+	return Rectangle{sdl.Rect{X: x1, Y: y1, W: x2 - x1, H: y2 - y1}}
+}
+
+func RectSize(x, y, w, h int32) Rectangle { return Rectangle{sdl.Rect{X: x, Y: y, W: w, H: h}} }
+
+func (r Rectangle) Bottom() int32 { return r.Y + r.H }
+
+func (r Rectangle) IsPointInside(x, y int32) bool {
+	return x >= r.X && x < r.X+r.W && y >= r.Y && y < r.Y+r.H
+}
+
+func (r Rectangle) IsPointInsidePt(p Point) bool { return r.IsPointInside(p.X, p.Y) }
+
+func (r Rectangle) Right() int32 { return r.X + r.W }
+
+func (r Rectangle) SDL() sdl.Rect     { return r.Rect }
+func (r Rectangle) SDLPtr() *sdl.Rect { return &r.Rect }

terrainrenderer.go

@@ -24,6 +24,10 @@ func NewTerrainRenderer(terrain *Map) Control {
 	return &terrainRenderer{terrain: terrain, project: newProjection()}
 }
 
+func (r *terrainRenderer) Arrange(ctx *Context, _ Rectangle) {
+	r.project.update(ctx.Renderer)
+}
+
 func (r *terrainRenderer) Init(ctx *Context) error {
 	r.project.update(ctx.Renderer)
 	return nil
@@ -32,47 +36,46 @@ func (r *terrainRenderer) Init(ctx *Context) error {
 func (r *terrainRenderer) Handle(ctx *Context, event sdl.Event) {
 	switch e := event.(type) {
 	case *sdl.MouseButtonEvent:
+		if r.project.windowInteractRect.IsPointInside(e.X, e.Y) {
 			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}
+					r.interact.mouseDrag = PtPtr(e.X, e.Y)
 				} else if !r.interact.mouseLeftDown && r.interact.mouseDrag != nil {
 					r.interact.mouseDrag = nil
 				}
 			}
+		}
 	case *sdl.MouseMotionEvent:
-		if insideRect(e.X, e.Y, &r.project.windowRect) {
+		if r.project.windowInteractRect.IsPointInside(e.X, e.Y) {
 			hover := r.project.screenToMap(e.X, e.Y)
-			r.hover = &Point{X: int32(Round32(hover.X)), Y: int32(Round32(hover.Y))}
+			r.hover = PtPtr(int32(Round32(hover.X)), int32(Round32(hover.Y)))
 		} else {
 			r.hover = nil
 		}
 		if r.interact.mouseDrag != nil {
 			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}
+			r.interact.mouseDrag = PtPtr(e.X, e.Y)
 		}
 	case *sdl.MouseWheelEvent:
-		if e.Y > 0 && r.project.zoom > .5 {
-			r.project.zoom *= .5
-			r.project.update(ctx.Renderer)
-		} else if e.Y < 0 && r.project.zoom < 4 {
-			r.project.zoom *= 2
-			r.project.update(ctx.Renderer)
+		if r.hover != nil {
+			zoom := r.project.zoom
+			if e.Y < 0 && r.project.zoom > .25 {
+				zoom *= .5
+			} else if e.Y > 0 && r.project.zoom < 2 {
+				zoom *= 2
 			}
-	case *sdl.WindowEvent:
-		if e.Event == sdl.WINDOWEVENT_RESIZED {
+			if zoom != r.project.zoom {
+				hover := r.hover.ToPtF()
+				r.project.center = hover.Sub(hover.Sub(r.project.center).Mul(r.project.zoom / zoom))
+				r.project.zoom = zoom
 				r.project.update(ctx.Renderer)
 			}
 		}
 	}
-
-func insideRect(x, y int32, rect *sdl.Rect) bool {
-	return x >= rect.X && x < rect.X+rect.W && y >= rect.Y && y < rect.Y+rect.H
 }
 
-func insideRectPt(p Point, rect *sdl.Rect) bool { return insideRect(p.X, p.Y, rect) }
-
 func (r *terrainRenderer) Render(ctx *Context) {
 	toTileTexture := func(x, y int32) *Texture {
 		temp := r.terrain.Temp.Value(x, y)
@@ -156,10 +159,10 @@ func (r *terrainRenderer) Render(ctx *Context) {
 	r.project.visibleTiles(func(x, y int32, pos Point) {
 		text := toTileTexture(x, y)
 		rect := r.project.screenToTileRect(pos)
-		text.Copy(ctx.Renderer, rect)
+		text.CopyResize(ctx.Renderer, rect)
 
 		if r.hover != nil && x == r.hover.X && y == r.hover.Y {
-			ctx.Textures.Texture("tile-hover").Copy(ctx.Renderer, rect)
+			ctx.Textures.Texture("tile-hover").CopyResize(ctx.Renderer, rect)
 		}
 	})
 
@@ -171,7 +174,7 @@ func (r *terrainRenderer) Render(ctx *Context) {
 
 		placeX, placeY := r.terrain.PlaceX.Value(x, y), r.terrain.PlaceY.Value(x, y)
 		pos = r.project.mapToScreenF(float32(x)-.2+float32(.9*placeX-.45), float32(y)-.2+float32(.9*placeY-.45))
-		text.Copy(ctx.Renderer, r.project.screenToTileRect(pos))
+		text.CopyResize(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})

textures.go

@@ -11,7 +11,7 @@ import (
 
 type Texture struct {
 	texture *sdl.Texture
-	rect    *sdl.Rect
+	size    Point
 }
 
 func NewTextureFromSurface(renderer *sdl.Renderer, surface *sdl.Surface) (*Texture, error) {
@@ -19,21 +19,33 @@ func NewTextureFromSurface(renderer *sdl.Renderer, surface *sdl.Surface) (*Textu
 	if err != nil {
 		return nil, err
 	}
-	return &Texture{texture: texture, rect: &sdl.Rect{X: 0, Y: 0, W: surface.W, H: surface.H}}, nil
+	return &Texture{texture: texture, size: Pt(surface.W, surface.H)}, nil
 }
 
-func (t *Texture) Rect() *sdl.Rect { return t.rect }
+func (t *Texture) Size() Point { return t.size }
 
-func (t *Texture) RectOffset(offset Point) *sdl.Rect {
-	return &sdl.Rect{X: offset.X, Y: offset.Y, W: t.rect.W, H: t.rect.H}
+// func (t *Texture) Rect() Rectangle { return t.rect }
+
+// func (t *Texture) SDLRectPtr() *sdl.Rect { return t.rect.SDLPtr() }
+
+func (t *Texture) Copy(renderer *sdl.Renderer, dst Point) {
+	t.CopyResize(renderer, RectSize(dst.X, dst.Y, t.size.X, t.size.Y))
 }
 
-func (t *Texture) Copy(renderer *sdl.Renderer, target *sdl.Rect) {
-	renderer.Copy(t.texture, t.rect, target)
+func (t *Texture) CopyPart(renderer *sdl.Renderer, src Rectangle, dst Point) {
+	t.CopyPartResize(renderer, src, RectSize(dst.X, dst.Y, src.W, src.H))
 }
 
-// func (t *Texture) CopyF(renderer *sdl.Renderer, target *sdl.FRect) {
-// 	renderer.CopyF(t.texture, t.rect, target) // Depends on SDL >=2.0.10
+func (t *Texture) CopyPartResize(renderer *sdl.Renderer, src Rectangle, dst Rectangle) {
+	renderer.Copy(t.texture, src.SDLPtr(), dst.SDLPtr())
+}
+
+func (t *Texture) CopyResize(renderer *sdl.Renderer, dst Rectangle) {
+	t.CopyPartResize(renderer, Rect(0, 0, t.size.X, t.size.Y), dst)
+}
+
+// func (t *Texture) CopyF(renderer *sdl.Renderer, dst *sdl.FRect) {
+// 	renderer.CopyF(t.texture, t.rect, dst) // Depends on SDL >=2.0.10
 // }
 
 func (t *Texture) Destroy() { t.texture.Destroy() }