koobas.hobune.stream
Drag 0, 90, 180 or 270 degrees from first object
First let me explain what I already have.
The placementNode (The gameobject what follows the mouse) follows the mouse on a (temporary) 32*32 grid. When you click, the newNode (the gameobject what is used to place the road) is instantiate at the x and z position of the mouse. Therefore I use the following code:
#pragma strict
var gridSize : int = 32;
var nodePrefab : Transform;
private var rayHitWorldPosition : Vector3;
function Update () {
var rayHit : RaycastHit;
if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), rayHit))
{
// where did the raycast hit in the world - position of rayhit
rayHitWorldPosition = rayHit.point;
var xPos = Mathf.Floor(rayHit.point.x / gridSize) * gridSize;
var zPos = Mathf.Floor(rayHit.point.z / gridSize) * gridSize;
}
transform.position.x = xPos;
transform.position.z = zPos;
if(Input.GetMouseButton(0)){
var newNode = Instantiate(nodePrefab, Vector3(xPos,transform.position.y,zPos), Quaternion.identity);
}
}
This code works perfect for me. But now comes the question,
When the nodePrefab is instantiated, you have to 'drag' to a direction. The length doesn't matter. But I want that you can only drag in a straight line, so only in 0, 90, 180 or 270 degrees from the nodePrefab.
Red: nodePrefab (First instantiated on mouseclick) Grey: Dragged from red. Can be dragged in all directions. Light blue: This is NOT how it should be.
Can someone advise me on how to do this?
Could you store the 'lastXPos' and 'lastYPos' and check that one of them is the same before drawing.
if(Input.GetMouseButton(0) && (xPos==lastXPos || yPos==lastYPos)){
var newNode = Instantiate(nodePrefab, Vector3(xPos,transform.position.y,zPos), Quaternion.identity);
lastXPos = xPos;
lastYPos = yPos;
}
Edit: You'll have to do something different the first time you click.. so you could set both to -1 on mouseUp to allow you to click somewhere new.. like if(Input.GetMouseButton(0) && (xPos==lastXPos || yPos==lastYPos)){
Just check which one of the two vector components is larger and move in that direction:
dragDir = mousePosition - originalMousePosition;
dragDir.x = Mathf.Abs(dragDir.x) > Mathf.Abs(dragDir.z) ? dragDir.x : 0;
dragDir.z = Mathf.Abs(dragDir.x) > Mathf.Abs(dragDir.z) ? 0 : dragDir.z;
//Instantiate at dragDir
Hope that helps!
Scribe
