How to fill selected area with prefabs?

Questions & Answers
1

Hello, I am making a 3D top-down game.

I have a JS script that allows me to drag a texture like a selection box in an RTS game.
At the end of the selection I want to fill the selected area automatically with prefabs.

I just dont know how…

private var mouseButton1DownPoint : Vector2;
private var mouseButton1UpPoint : Vector2;
private var mouseButton2DownPoint : Vector2;
private var mouseButton2UpPoint : Vector2;
private var mouseLeftDrag : boolean = false;
private var raycastLength : float = 200.0;

// semi transparent texture for the selection rectangle
var selectionTexture : Texture;
// floor Spawner
var ConstGrid : GameObject;

// range in which a mouse down and mouse up event will be treated as "the same location" on the map.
private var mouseButtonReleaseBlurRange : int = 20;

function OnGUI() {
if (mouseLeftDrag) {

var width : int = mouseButton1UpPoint.x - mouseButton1DownPoint.x;
var height : int = (Screen.height - mouseButton1UpPoint.y) - (Screen.height - mouseButton1DownPoint.y);
var rect : Rect = Rect(mouseButton1DownPoint.x, Screen.height - mouseButton1DownPoint.y, width, height);
GUI.DrawTexture (rect, selectionTexture, ScaleMode.StretchToFill, true);
}
}

function Update ()
{
// Left mouse button
if (Input.GetButtonDown("Fire1")) {
Mouse1Down(Input.mousePosition);
}

if (Input.GetButtonUp("Fire1")) {
Mouse1Up(Input.mousePosition);
}

if (Input.GetButton("Fire1")) {
// Used to determine if there is some mouse drag operation going on.
Mouse1DownDrag(Input.mousePosition);
}

//Right mouse button
if (Input.GetButtonDown("Fire2")) {
Destroy(gameObject);
}

}

function Mouse1DownDrag(screenPosition : Vector2) {
// Only show the drag selection texture if the mouse has been moved and not if the user made only a single left mouse click
if (screenPosition != mouseButton1DownPoint) {
mouseLeftDrag = true;
// while dragging, update the current mouse pos for the selection rectangle.
mouseButton1UpPoint = screenPosition;

var hit : RaycastHit;
ray = Camera.main.ScreenPointToRay (screenPosition);
if ( Physics.Raycast (ray, hit, raycastLength) )
{
selectionPointEnd = hit.point;
}	

}
}

function Mouse1Down(screenPosition : Vector2) {

mouseButton1DownPoint = screenPosition;

var hit : RaycastHit;
var ray = Camera.main.ScreenPointToRay (mouseButton1DownPoint);

if ( Physics.Raycast (ray, hit, raycastLength))
{

mouseButton1DownTerrainHitPoint = hit.point;
selectionPointStart = hit.point;
}
}

function Mouse1Up(screenPosition : Vector2) {

mouseButton1UpPoint = screenPosition;
var hit : RaycastHit;

mouseLeftDrag = false;
}
2

ok, i did’nt uderstanded well your code, but to fill a retangle with prefabs knowing his start point and end point is simple:

start._____________
      !            !
      !            !
      !            !
      !            !
      !____________!. end

if your prefabs are circles with a diameter of 1 unit, you only need to arrange two loops and put then inside the retangle:

function retangule (StartPoint : Vector3,EndPoint : Vector3) {
var Retangle : Vector3;
Retangle = EndPoint - StartPoint;
var width : int = Retangle.x/radius;
var height : int = Retangle.z/radius;
var d : Vector2 = Vector2(1,1);
if( width <0)
{
width = -width;
d.x = -1;
}
if( height <0)
{
height = -height;
d.y = -1;
}
for(var x=0;x<width;x++)
{
for(var z=0;z<height;z++)
{
var px : float = StartPoint.x+(x*radius*d.x);
var pz : float = StartPoint.z+(z*radius*d.y);
Instantiate(prefab,Vector3(px,0,pz),prefab.transform.rotation);
}
}
}

}