sand/main.go at main · mslaursen/sand · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
package main

import (
	"fmt"
	"log"

	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
	"github.com/martinlaursen97/sand/config"
	"github.com/martinlaursen97/sand/core"
	"github.com/martinlaursen97/sand/maths"
)

type Game struct {
	world         *core.World
	brushSize     int
	paused        bool
	particleNum   int
	mouseClicked  bool
	prevCursor    maths.Vector
	currentCursor maths.Vector
}

func (g *Game) Update() error {
	dt := 1.0 / ebiten.ActualTPS()

	g.world.Update(dt)

	cursorPositionX, cursorPositionY := ebiten.CursorPosition()

	mouseClicked := ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft)
	spacePressed := ebiten.IsKeyPressed(ebiten.KeySpace)
	pickSand := ebiten.IsKeyPressed(ebiten.Key1)
	pickWater := ebiten.IsKeyPressed(ebiten.Key2)
	pickWall := ebiten.IsKeyPressed(ebiten.Key3)
	pickEraser := ebiten.IsKeyPressed(ebiten.Key4)

	_, dy := ebiten.Wheel()

	if spacePressed {
		g.world.Clear()
	}

	if dy > 0 {
		g.brushSize += config.BrushSizeIncrement
	}

	if dy < 0 {
		if g.brushSize-config.BrushSizeIncrement > 0 {
			g.brushSize -= config.BrushSizeIncrement
		} else {
			g.brushSize = 1
		}
	}

	if pickSand {
		g.particleNum = 1
	}

	if pickWater {
		g.particleNum = 2
	}

	if pickWall {
		g.particleNum = 3
	}

	if pickEraser {
		g.particleNum = 4
	}

	if mouseClicked {
		g.prevCursor.X = g.currentCursor.X
		g.prevCursor.Y = g.currentCursor.Y

		g.currentCursor.X = float64(cursorPositionX)
		g.currentCursor.Y = float64(cursorPositionY)

		// Draw a line between the previous and current cursor position
		core.TraversePathAndApplyFunc(
			g.prevCursor,
			g.currentCursor,
			core.FunctionInput{
				Func: g.world.DrawWithBrush,
				Args: []interface{}{g.brushSize, g.particleNum},
			},
		)
	} else {
		g.currentCursor.X = float64(cursorPositionX)
		g.currentCursor.Y = float64(cursorPositionY)
	}

	g.world.Reset()

	return nil
}

func (g *Game) Draw(screen *ebiten.Image) {
	g.world.Draw(screen)
	ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %d", int(ebiten.ActualFPS())))

	particleCount := g.world.GetParticleCount()
	ebitenutil.DebugPrintAt(screen, fmt.Sprintf("Particles: %d", particleCount), 0, 15)

	sandCount := g.world.GetSandParticleCount()
	ebitenutil.DebugPrintAt(screen, fmt.Sprintf("Sand: %d", sandCount), 0, 30)

	wallCount := g.world.GetWallParticleCount()
	ebitenutil.DebugPrintAt(screen, fmt.Sprintf("Walls: %d", wallCount), 0, 45)
}

func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
	return config.ScreenWidth, config.ScreenHeight
}

func main() {
	ebiten.SetWindowSize(config.ScreenWidth*2, config.ScreenHeight*2)
	ebiten.SetWindowTitle("Sand")

	game := &Game{}
	game.world = core.NewWorld()
	game.brushSize = 5
	game.paused = false
	game.particleNum = 2

	if err := ebiten.RunGame(game); err != nil {
		log.Fatal(err)
	}
}