Fixing up examples to use pointer to the Space.

Fixing up AddShape() to just panic.

main.go

@@ -14,7 +14,7 @@ var screenWidth int32 = 320
 var screenHeight int32 = 240
 var cell int32 = 4
 
-var space resolv.Space
+var space *resolv.Space
 var renderer *sdl.Renderer
 var window *sdl.Window
 var avgFramerate int
@@ -43,6 +43,8 @@ func main() {
 
 	// Change this to one of the other World structs to change the world and see different tests
 
+	space = resolv.NewSpace()
+
 	var world WorldInterface = &World1{}
 
 	world.Create()

resolv/space.go

@@ -20,8 +20,7 @@ func NewSpace() *Space {
 func (sp *Space) AddShape(shapes ...Shape) {
 	for _, shape := range shapes {
 		if shape == sp {
-			fmt.Println("ERROR! Space ", shape, " cannot add itself!")
-			panic("")
+			panic(fmt.Sprintf("ERROR! Space %s cannot add itself!", shape))
 		}
 		*sp = append(*sp, shape)
 	}

world1.go

@@ -78,7 +78,7 @@ func (w *World1) Create() {
 		space.AddShape(resolv.NewRectangle(cell+(x*cell), cell+(y*cell), cell*(1+rand.Int31n(16)), cell*(1+rand.Int31n(16))))
 	}
 
-	for _, shape := range space {
+	for _, shape := range *space {
 		shape.SetTags("solid")
 	}
 
@@ -159,7 +159,7 @@ func (w *World1) Update() {
 
 func (w World1) Draw() {
 
-	for _, shape := range space {
+	for _, shape := range *space {
 
 		// Living on the edge~~~
 		// We know that this Space just has Rectangles, so we'll just assume they are

world2.go

@@ -17,7 +17,7 @@ func (w World2) Create() {
 	space.AddShape(resolv.NewRectangle(screenWidth-cell, cell, cell, screenHeight-cell))
 	space.AddShape(resolv.NewRectangle(cell, screenHeight-cell, screenWidth-(cell*2), cell))
 
-	for _, shape := range space {
+	for _, shape := range *space {
 		shape.SetTags("solid")
 	}
 
@@ -111,7 +111,7 @@ func (w World2) Draw() {
 
 	touching := "You aren't touching a zone"
 
-	for _, shape := range space {
+	for _, shape := range *space {
 
 		renderer.SetDrawColor(255, 255, 255, 255)
 

world3.go

@@ -24,7 +24,7 @@ func (w World3) Create() {
 	space.AddShape(resolv.NewRectangle(cell, screenHeight-cell, screenWidth-(cell*2), cell))
 	space.AddShape(resolv.NewCircle(30, 60, cell))
 
-	for _, shape := range space {
+	for _, shape := range *space {
 		shape.SetTags("solid")
 	}
 
@@ -86,7 +86,7 @@ func (world World3) Draw() {
 
 	touching := "Not touching a zone"
 
-	for _, shape := range space {
+	for _, shape := range *space {
 
 		renderer.SetDrawColor(255, 255, 255, 255)
 

world5.go

@@ -40,6 +40,8 @@ func (w *World5) Create() {
 	line = resolv.NewLine(lx, ly+ls, lx, ly)
 	space.AddShape(line)
 
+	space.AddShape(space)
+
 }
 
 func (w *World5) Update() {
@@ -66,7 +68,7 @@ func (w *World5) Update() {
 
 func (w *World5) Draw() {
 
-	for _, shape := range space {
+	for _, shape := range *space {
 
 		line, ok := shape.(*resolv.Line)
 

world6.go

@@ -36,7 +36,7 @@ func (w *World6) Create() {
 
 	space.AddShape(resolv.NewRectangle(c*4, screenHeight-c*4, c*3, c))
 
-	for _, shape := range space {
+	for _, shape := range *space {
 		shape.SetTags("solid")
 	}
 
@@ -164,7 +164,7 @@ func (w *World6) Update() {
 
 func (w *World6) Draw() {
 
-	for _, shape := range space {
+	for _, shape := range *space {
 
 		rect, ok := shape.(*resolv.Rectangle)
 

world7.go

@@ -36,7 +36,7 @@ func (w *World7) Create() {
 	space.AddShape(resolv.NewRectangle(0, 0, screenWidth, 16))
 	space.AddShape(resolv.NewRectangle(0, screenHeight-16, screenWidth, 16))
 
-	for _, shape := range space {
+	for _, shape := range *space {
 		shape.SetTags("solid")
 	}
 
@@ -234,9 +234,7 @@ func DrawObject(shape resolv.Shape) {
 
 func (w *World7) Draw() {
 
-	shapes := space[:]
-
-	for _, shape := range shapes {
+	for _, shape := range *space {
 		DrawObject(shape)
 	}