Alertbox added.

game/game.go

@@ -15,14 +15,13 @@ import (
 )
 
 const (
-	GameWidth          = 640
-	GameHeight         = 360
-	GameParticleCount  = 2000
-	GameGravity        = 2
-	GameParticleRadius = 5
-	GameDamping        = .7
-	GameDeltaTimeStep  = 0.5
-
+	GameWidth           = 640
+	GameHeight          = 360
+	GameParticleCount   = 2000
+	GameGravity         = 2
+	GameParticleRadius  = 5
+	GameDamping         = .7
+	GameDeltaTimeStep   = 0.5
 	GameInfluenceRadius = 30
 )
 
@@ -38,6 +37,7 @@ type Game struct {
 	resolvecollisions bool
 	resolvers         []func(particle *elements.Particle)
 	resolveridx       int
+	alertbox          *elements.Alert
 }
 
 func NewGame() *Game {
@@ -47,6 +47,7 @@ func NewGame() *Game {
 		renderquads:       false,
 		resolvecollisions: false,
 		resolveridx:       0,
+		alertbox:          elements.NewAlert(),
 	}
 
 	g.particlebox = &gamedata.Vector{
@@ -104,6 +105,12 @@ func (g *Game) Draw(screen *ebiten.Image) {
 	if g.renderquads {
 		g.RenderQuadrants(screen)
 	}
+
+	if g.paused {
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(50, 50)
+		screen.DrawImage(g.alertbox.Sprite, op)
+	}
 }
 
 func (g *Game) Layout(x, y int) (int, int) {
@@ -279,22 +286,30 @@ func (g *Game) RenderQuadrants(img *ebiten.Image) {
 }
 
 func (g *Game) ParseInputs() {
+
+	//refresh particles
 	if inpututil.IsKeyJustPressed(ebiten.KeyR) {
 		g.InitializeParticles()
 	}
 
+	//pause simulation
 	if inpututil.IsKeyJustPressed(ebiten.KeyP) {
 		g.paused = !g.paused
+		g.alertbox.SetText("PAUSED")
+		g.alertbox.Draw()
 	}
 
+	//show quadtree quadrants
 	if inpututil.IsKeyJustPressed(ebiten.KeyQ) {
 		g.renderquads = !g.renderquads
 	}
 
+	//enable collision resolution
 	if inpututil.IsKeyJustPressed(ebiten.KeyC) {
 		g.resolvecollisions = !g.resolvecollisions
 	}
 
+	//switch between collision resolvers
 	if inpututil.IsKeyJustPressed(ebiten.KeyLeft) {
 		g.resolveridx = g.resolveridx - 1
 		if g.resolveridx < 0 {
@@ -305,7 +320,6 @@ func (g *Game) ParseInputs() {
 	if inpututil.IsKeyJustPressed(ebiten.KeyRight) {
 		g.resolveridx = (g.resolveridx + 1) % len(g.resolvers)
 	}
-
 }
 
 func (g *Game) RebuildQuadtree() {