So I am trying to make it so the user can draw a line with a collider during the game. However, when I press mouse down the line flickers for a split second like this. Screen capture - b6707f425aec3a11d0dda3d967163773 - Gyazo
You can only see it in the second line in this gif. It doesn’t happen every time. Here is the code.
using UnityEngine;
using System.Collections;
public class TrailCollider : MonoBehaviour
{
private LineRenderer line; // Reference to LineRenderer
private Vector3 mousePos;
private Vector3 startPos; // Start position of line
private Vector3 endPos; // End position of line
void Update ()
{
// On mouse down new line will be created
if(Input.GetMouseButtonDown(0))
{
if(line == null)
createLine();
mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
mousePos.z = 0;
line.SetPosition(0,mousePos);
startPos = mousePos;
}
else if(Input.GetMouseButtonUp(0))
{
if(line)
{
mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
mousePos.z = 0;
line.SetPosition(1,mousePos);
endPos = mousePos;
addColliderToLine();
line = null;
}
}
else if(Input.GetMouseButton(0))
{
if(line)
{
mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
mousePos.z = 0;
line.SetPosition(1,mousePos);
}
}
}
// Following method creates line runtime using Line Renderer component
private void createLine()
{
line = new GameObject(“Line”).AddComponent();
line.material = new Material(Shader.Find(“Diffuse”));
line.SetVertexCount(2);
line.SetWidth(0.1f,0.1f);
line.SetColors(Color.black, Color.black);
line.useWorldSpace = true;
}
// Following method adds collider to created line
private void addColliderToLine()
{
BoxCollider2D col = new GameObject(“Collider”).AddComponent ();
col.transform.parent = line.transform; // Collider is added as child object of line
float lineLength = Vector3.Distance (startPos, endPos); // length of line
col.size = new Vector3 (lineLength, 0.1f, 1f); // size of collider is set where X is length of line, Y is width of line, Z will be set as per requirement
Vector3 midPoint = (startPos + endPos)/2;
col.transform.position = midPoint; // setting position of collider object
// Following lines calculate the angle between startPos and endPos
float angle = (Mathf.Abs (startPos.y - endPos.y) / Mathf.Abs (startPos.x - endPos.x));
if((startPos.y<endPos.y && startPos.x>endPos.x) || (endPos.y<startPos.y && endPos.x>startPos.x))
{
angle*=-1;
}
angle = Mathf.Rad2Deg * Mathf.Atan (angle);
col.transform.Rotate (0, 0, angle);
}
}