Add tutorial

game/game.go

@@ -192,7 +192,6 @@ func (g *game) Update() error {
 			nil,
 			nil,
 			nil,
-			nil,
 			{
 				StructureType: world.StructureToggleHelp,
 				Sprite:        asset.ImgHelp,
@@ -347,6 +346,7 @@ func (g *game) addSystems() {
 	ecs.AddSystem(system.NewTickSystem())
 	ecs.AddSystem(system.NewPowerScanSystem())
 	ecs.AddSystem(system.NewPopulateSystem())
+	ecs.AddSystem(system.NewTaxSystem())
 
 	// Input systems.
 	g.movementSystem = system.NewMovementSystem()

system/input_move.go

@@ -1,6 +1,7 @@
 package system
 
 import (
+	"errors"
 	"math/rand"
 	"os"
 	"strings"
@@ -50,8 +51,16 @@ func (_ *playerMoveSystem) Uses() []gohan.ComponentID {
 }
 
 func (s *playerMoveSystem) buildStructure(structureType int, tileX int, tileY int, playSound bool) (*world.Structure, error) {
+	cost := world.StructureCosts[structureType]
+	if world.World.Funds < cost {
+		world.ShowMessage("Insufficient funds", 3)
+		return nil, errors.New("insufficient funds")
+	}
+
 	structure, err := world.BuildStructure(world.World.HoverStructure, false, tileX, tileY)
 	if err == nil {
+		world.World.LastBuildX, world.World.LastBuildY = tileX, tileY
+
 		if world.IsPowerPlant(world.World.HoverStructure) {
 			plant := &world.PowerPlant{
 				Type: world.World.HoverStructure,
@@ -351,8 +360,8 @@ func (s *playerMoveSystem) Update(ctx *gohan.Context) error {
 		if tileX >= 0 && tileY >= 0 && tileX < 256 && tileY < 256 {
 			multiUseStructure := world.World.HoverStructure == world.StructureBulldozer || world.World.HoverStructure == world.StructureRoad || world.IsZone(world.World.HoverStructure)
 			dragStarted := world.World.BuildDragX != -1 || world.World.BuildDragY != -1
-			if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) || (multiUseStructure && ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft)) || dragStarted {
-				if !dragStarted {
+			if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) || (multiUseStructure && ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft)) || (multiUseStructure && dragStarted) {
+				if !dragStarted && world.World.Funds >= world.StructureCosts[world.World.HoverStructure] {
 					world.World.BuildDragX, world.World.BuildDragY = int(tileX), int(tileY)
 
 					if world.World.HoverStructure == world.StructureBulldozer {
@@ -366,17 +375,22 @@ func (s *playerMoveSystem) Update(ctx *gohan.Context) error {
 					if dragStarted && !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
 						// TODO build all tiles
 						world.World.Level.ClearHoverSprites()
-						var cost int
 						var builtRoad bool
-						for _, tile := range tiles {
-							_, err := s.buildStructure(world.World.HoverStructure, tile[0], tile[1], !builtRoad)
-							if err == nil {
-								cost += world.StructureCosts[world.World.HoverStructure]
-								builtRoad = true
+						cost := world.StructureCosts[world.World.HoverStructure] * len(tiles) / 2
+						if cost <= world.World.Funds {
+							cost = 0
+							for _, tile := range tiles {
+								_, err := s.buildStructure(world.World.HoverStructure, tile[0], tile[1], !builtRoad)
+								if err == nil {
+									cost += world.StructureCosts[world.World.HoverStructure]
+									builtRoad = true
+								}
 							}
-						}
-						if cost > 0 {
-							world.ShowBuildCost(world.World.HoverStructure, cost)
+							if cost > 0 {
+								world.ShowBuildCost(world.World.HoverStructure, cost)
+							}
+						} else {
+							world.ShowMessage("Insufficient funds", 3)
 						}
 
 						world.World.BuildDragX, world.World.BuildDragY = -1, -1
@@ -385,9 +399,13 @@ func (s *playerMoveSystem) Update(ctx *gohan.Context) error {
 						// TODO draw hover sprites
 						// TODO move below into shared func
 						world.World.Level.ClearHoverSprites()
+						world.BuildStructure(world.World.HoverStructure, true, int(tileX), int(tileY))
+						var cost int
 						for _, tile := range tiles {
 							world.BuildStructure(world.World.HoverStructure, true, tile[0], tile[1])
+							cost += world.StructureCosts[world.World.HoverStructure]
 						}
+						world.World.HoverValid = cost <= world.World.Funds
 					}
 					return nil
 				} else if dragStarted && !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
@@ -406,15 +424,18 @@ func (s *playerMoveSystem) Update(ctx *gohan.Context) error {
 					if err == nil {
 						tileX, tileY = float64(structure.X), float64(structure.Y)
 						world.ShowBuildCost(world.World.HoverStructure, cost)
+						if !multiUseStructure {
+							world.World.HoverStructure = 0
+							world.World.BuildDragX, world.World.BuildDragY = -1, -1
+							world.World.LastBuildX, world.World.LastBuildY = -1, -1
+						}
 					}
 
-					world.BuildStructure(world.World.HoverStructure, true, int(tileX), int(tileY))
+					if world.World.HoverStructure > 0 {
+						world.BuildStructure(world.World.HoverStructure, true, int(tileX), int(tileY))
+					}
 				}
 			} else {
-				if world.World.LastBuildX != -1 || world.World.LastBuildY != -1 {
-					world.World.LastBuildX, world.World.LastBuildY = -1, -1
-				}
-
 				world.World.Level.ClearHoverSprites()
 
 				world.BuildStructure(world.World.HoverStructure, true, int(tileX), int(tileY))

system/renderhud.go

@@ -16,7 +16,7 @@ import (
 
 const (
 	helpW = 480
-	helpH = 185
+	helpH = 225
 )
 
 type RenderHudSystem struct {
@@ -114,8 +114,13 @@ func (s *RenderHudSystem) drawSidebar() {
 			s.drawButtonBackground(s.tmpImg, r, selected)
 
 			// Draw sprite.
+			colorScale := 1.0
+			if selected {
+				colorScale = 0.9
+			}
 			op := &ebiten.DrawImageOptions{}
 			op.GeoM.Translate(float64(x+paddingSize)+button.SpriteOffsetX, float64(y+paddingSize)+button.SpriteOffsetY)
+			op.ColorM.Scale(colorScale, colorScale, colorScale, 1)
 			s.tmpImg.SubImage(image.Rect(r.Min.X, r.Min.Y, r.Max.X, r.Max.Y)).(*ebiten.Image).DrawImage(button.Sprite, op)
 
 			s.drawButtonBorder(s.tmpImg, r, selected)

system/tax.go

@@ -0,0 +1,51 @@
+package system
+
+import (
+	"code.rocketnine.space/tslocum/citylimits/component"
+	"code.rocketnine.space/tslocum/citylimits/world"
+	"code.rocketnine.space/tslocum/gohan"
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type TaxSystem struct {
+}
+
+func NewTaxSystem() *TaxSystem {
+	s := &TaxSystem{}
+
+	return s
+}
+
+func (s *TaxSystem) Needs() []gohan.ComponentID {
+	return []gohan.ComponentID{
+		component.PositionComponentID,
+		component.VelocityComponentID,
+		component.WeaponComponentID,
+	}
+}
+
+func (s *TaxSystem) Uses() []gohan.ComponentID {
+	return nil
+}
+
+func (s *TaxSystem) Update(_ *gohan.Context) error {
+	if world.World.Paused {
+		return nil
+	}
+
+	if world.World.Ticks%world.YearTicks != 0 {
+		return nil
+	}
+
+	for _, zone := range world.World.Zones {
+		if !zone.Powered {
+			continue
+		}
+		_ = zone
+	}
+	return nil
+}
+
+func (s *TaxSystem) Draw(ctx *gohan.Context, screen *ebiten.Image) error {
+	return gohan.ErrSystemWithoutDraw
+}

world/help.go

@@ -2,19 +2,64 @@ package world
 
 // HelpText lines must be 39 characters or less.
 var HelpText = []string{`
-Welcome to City Limits!           (1/3)
-Blah blah blah...1231231231231231231234
-Testing, testing... Testing, testing...
-How does this much text per page seem?
-`, `
-Yadda yadda yadda                 (2/3)
-Do you like the game?
-I hoped you would.
-I spent a lot of time making it.
-`, `
-Oh no... More text?!?             (3/3)
-If I wanted to read, I would have
-grabbed a book, not a game! I'm outta
-here! *Door slam*... *Engine starting*
+Welcome to City Limits!          (1/10)
+As the new mayor, it's time to run
+things YOUR way. For better or worse...
+Will you lead the clean energy front,
+or will you put profits before people?
+`, `
+Moving via mouse                 (2/10)
+To move around, place your cursor at
+the edge of the screen, or press and
+hold your middle mouse button while
+moving your cursor.
+`, `
+Moving via keyboard              (3/10)
+You can also use your keyboard to move
+by pressing any of the arrow keys or
+W/A/S/D. Try using your mouse and/or
+keyboard to move the camera around now.
+`, `
+Zoning areas                     (4/10)
+Structures are built according to the
+zoning category of an area. Demand for
+each category (Residential, Commercial,
+Industrial) is shown in the sidebar.
+`, `
+Did you know?                    (5/10)
+Powering an area requires more input
+energy than the resulting electricity.
+In in fact, only a third of the energy
+is transmitted as usable electricity. 
+`, `
+Building blocks of a city        (6/10)
+Structures require power, sewer and
+transportation in order to function.
+This is all facilitated via roads and
+underground wiring and piping.
+`, `
+Did you know?                    (7/10)
+Meat-based diets require much more
+energy, land and water resources than
+vegetarian and especially vegan diets.
+Animal farms are a source of pollution.
+`, `
+Power to the people              (8/10)
+Build a power plant, then zone a few
+areas for residential development.
+Connect the power plant to the newly
+zoned areas with a road.
+`, `
+Did you know?                    (9/10)
+It takes large amounts of water to
+convert fossil fuels into electricity.
+Converting solar and wind energy uses
+negligible amounts of water.
+`, `
+Collecting taxes                (10/10)
+Each year, taxes are collected from the
+residents of the city. The tax rate you
+set determines how appealing your city
+is, and whether or not it can survive.
 `,
 }

world/world.go

@@ -63,6 +63,12 @@ var HUDButtons []*HUDButton
 var CameraMinZoom = 0.1
 var CameraMaxZoom = 1.0
 
+const (
+	startingTaxR = 0.12
+	startingTaxC = 0.12
+	startingTaxI = 0.12
+)
+
 var World = &GameWorld{
 	CamScale:       startingZoom,
 	CamScaleTarget: startingZoom,
@@ -190,6 +196,10 @@ type GameWorld struct {
 	LastBuildX int
 	LastBuildY int
 
+	TaxR float64
+	TaxC float64
+	TaxI float64
+
 	resetTipShown bool
 }
 
@@ -604,7 +614,12 @@ func SetHoverStructure(structureType int) {
 }
 
 func Satisfaction() (r, c, i float64) {
-	return 0.01, 0.0, 0.02
+	popR, _, _ := Population()
+	c = float64(popR) / (maxPopulation / 2)
+	if c > 0.02 {
+		c = 0.02
+	}
+	return 0.02, c, 0.02
 }
 
 func TargetPopulation() (r, c, i int) {