koobas.hobune.stream
Remove points of LineRenderer?
Hi,
I found this thread about how to add line with "LineRenderer" after a click (http://answers.unity3d.com/questions/377596/how-do-you-draw-a-line-using-your-finger-on-androi.html), and I would like to remove the points already drawn after 1 second, but my "removePoint" function does not work:
It seems to remove a slight line in the middle of the lines created, but the previous lines stay as is on screen (for example, if I click anywhere and move the mouse, all the lines previously created will remain, even after 1 second).
Would you know why this does not work? I have tried to remove the first point at index 0 with "RemovePoint" at the same rate as "AddPoint" : this code is in C#, and "AddPoint" works fine with just a "LineRenderer" and the script attached to the camera :
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class TestLine : MonoBehaviour {
LineRenderer lineRenderer;
List<Vector3> myPoints;
private float timeCount;
private int indexRemove;
// Use this for initialization
void Start () {
myPoints = new List<Vector3>();
lineRenderer = GetComponent<LineRenderer>();
timeCount = 0;
lineRenderer.SetWidth(0.2f,0.2f);
}
// Update is called once per frame
void Update () {
if(myPoints != null){//myPoints != null
lineRenderer.SetVertexCount(myPoints.Count);
for(int i = 0;i<myPoints.Count;i++){
lineRenderer.SetPosition(i,myPoints[i]);
}
}
else
lineRenderer.SetVertexCount(0);
if (timeCount>1){
InvokeRepeating("RemovePoint",.02f,.02f);
}
if(Input.GetMouseButtonDown(0)){
InvokeRepeating("AddPoint",.02f,.02f);
}
if(Input.GetMouseButtonUp(0)){
CancelInvoke();
myPoints = null;
}
}//end Update
private void RemovePoint(){
myPoints.RemoveAt(0);
}
private void AddPoint(){
int j = 0;
List<Vector3> tempPoints = new List<Vector3>();
if(myPoints != null){
for(j = 0; j < myPoints.Count; j++)
tempPoints.Add(myPoints[j]);
}
Vector3 tempPos = new Vector3();
tempPos = Input.mousePosition;
tempPos.z = 5;
tempPoints.Add( Camera.main.ScreenToWorldPoint(tempPos) );
myPoints = new List<Vector3>();
myPoints = tempPoints;
}
}
Thanks
The reason nothing is removed after 1 second is that timeCount is never incremented. That is, typically you would see a line like...
lineCount += Time.deltaTime;
...in the update loop. But making that change does not fix this code because it will result in InvokeRepeating() getting called each frame. I've modified Update() to give you what I think you want:
void Update () {
if(myPoints != null){//myPoints != null
lineRenderer.SetVertexCount(myPoints.Count);
for(int i = 0;i<myPoints.Count;i++){
lineRenderer.SetPosition(i,myPoints[i]);
}
}
else
lineRenderer.SetVertexCount(0);
if(Input.GetMouseButtonDown(0)){
InvokeRepeating("AddPoint",.02f,.02f);
InvokeRepeating ("RemovePoint", 1.0f, 0.02f);
}
if(Input.GetMouseButtonUp(0)){
CancelInvoke();
myPoints = null;
}
}//end Update
Paste that in place of your existing Update().
