Interaction adjustment for n fluidsims.

game/game.go

@@ -34,7 +34,7 @@ type Game struct {
 	fluidsim10height float64
 
 	//other
-	fluidsim10angle float64
+	fluidsim10angle float64 //purely for debugging
 	mdown           bool
 	mdx, mdy        int
 }
@@ -114,11 +114,12 @@ func (g *Game) RenderFluidSim10(img *ebiten.Image) {
 	for _, sim := range g.fluidsim10 {
 		sim.Draw()
 
+		angle := sim.GetAngle()
 		pos := sim.GetPosition()
 		op := &ebiten.DrawImageOptions{}
 		op.GeoM.Translate(-g.fluidsim10width/2, -g.fluidsim10height/2)
 		op.GeoM.Scale(1, -1)
-		op.GeoM.Rotate(g.fluidsim10angle)
+		op.GeoM.Rotate(angle)
 		//	op.GeoM.Translate(g.fluidsim10width/2, g.fluidsim10height/2)
 		op.GeoM.Translate(pos.X, pos.Y)
 		img.DrawImage(sim.GetSprite(), op)
@@ -218,12 +219,12 @@ func (g *Game) ManageFluidSim10Inputs() {
 	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
 		if g.mdown {
 			mx, my := ebiten.CursorPosition()
-			dx := float64(mx) - GameWidth/2  //g.fluidsim10.GetPosition().X
-			dy := float64(my) - GameHeight/2 //g.fluidsim10.GetPosition().Y
-			angle := math.Atan2(dy, dx)
-			g.fluidsim10angle = angle
 
 			for _, sim := range g.fluidsim10 {
+				dx := float64(mx) - sim.GetPosition().X
+				dy := float64(my) - sim.GetPosition().Y
+				angle := math.Atan2(dy, dx)
+				g.fluidsim10angle = angle
 				sim.SetAngle(angle)
 			}
 		}