RTS-stijl eenheidselectie voor Unity
In deze tutorial laat ik zien hoe je een RTS (Real-Time Strategy) box-achtige eenheidselectie kunt maken in Unity.
Dus laten we beginnen!
Stap 1: Maak de benodigde scripts
Dit bericht bevat 2 scripts:
SC_Selectable.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class SC_Selectable : MonoBehaviour
{
public Renderer[] renderers; //Assign all child Mesh Renderers
public Bounds GetObjectBounds()
{
Bounds totalBounds = new Bounds();
for(int i = 0; i < renderers.Length; i++)
{
if(totalBounds.center == Vector3.zero)
{
totalBounds = renderers[i].bounds;
}
else
{
totalBounds.Encapsulate(renderers[i].bounds);
}
}
return totalBounds;
}
void OnEnable()
{
//Add this Object to global list
if (!SC_SelectionManager.selectables.Contains(this))
{
SC_SelectionManager.selectables.Add(this);
}
}
void OnDisable()
{
//Remove this Object from global list
if (SC_SelectionManager.selectables.Contains(this))
{
SC_SelectionManager.selectables.Remove(this);
}
}
}
SC_SelectionManager.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class SC_SelectionManager : MonoBehaviour
{
public Texture topLeftBorder;
public Texture bottomLeftBorder;
public Texture topRightBorder;
public Texture bottomRightBorder;
Texture2D _borderTexture;
Texture2D borderTexture
{
get
{
if (_borderTexture == null)
{
_borderTexture = new Texture2D(1, 1);
_borderTexture.SetPixel(0, 0, Color.white);
_borderTexture.Apply();
}
return _borderTexture;
}
}
bool selectionStarted = false;
Vector3 mousePosition1;
public static List<SC_Selectable> selectables = new List<SC_Selectable>();
List<int> selectedObjects = new List<int>();
// Update is called once per frame
void Update()
{
// Begin selection
if (Input.GetMouseButtonDown(0))
{
selectionStarted = true;
mousePosition1 = Input.mousePosition;
}
// End selection
if (Input.GetMouseButtonUp(0))
{
selectionStarted = false;
}
if (selectionStarted)
{
// Detect which Objects are inside selection rectangle
Camera camera = Camera.main;
selectedObjects.Clear();
for (int i = 0; i < selectables.Count; i++)
{
Bounds viewportBounds = GetViewportBounds(camera, mousePosition1, Input.mousePosition);
if (viewportBounds.Contains(camera.WorldToViewportPoint(selectables[i].transform.position)))
{
selectedObjects.Add(i);
}
}
}
}
void OnGUI()
{
if (selectionStarted)
{
Rect rect = GetScreenRect(mousePosition1, Input.mousePosition);
DrawScreenRectBorder(rect, 2, Color.cyan);
}
// Draw selection edges
if(selectedObjects.Count > 0)
{
Camera camera = Camera.main;
for (int i = 0; i < selectedObjects.Count; i++)
{
DrawSelectionIndicator(camera, selectables[selectedObjects[i]].GetObjectBounds());
}
}
}
void DrawScreenRectBorder(Rect rect, float thickness, Color color)
{
// Top
DrawBorderRect(new Rect(rect.xMin, rect.yMin, rect.width, thickness), color);
// Left
DrawBorderRect(new Rect(rect.xMin, rect.yMin, thickness, rect.height), color);
// Right
DrawBorderRect(new Rect(rect.xMax - thickness, rect.yMin, thickness, rect.height), color);
// Bottom
DrawBorderRect(new Rect(rect.xMin, rect.yMax - thickness, rect.width, thickness), color);
}
void DrawBorderRect(Rect rect, Color color)
{
GUI.color = color;
GUI.DrawTexture(rect, borderTexture);
GUI.color = Color.white;
}
Rect GetScreenRect(Vector3 screenPosition1, Vector3 screenPosition2)
{
// Move origin from bottom left to top left
screenPosition1.y = Screen.height - screenPosition1.y;
screenPosition2.y = Screen.height - screenPosition2.y;
// Calculate corners
var topLeft = Vector3.Min(screenPosition1, screenPosition2);
var bottomRight = Vector3.Max(screenPosition1, screenPosition2);
// Create Rect
return Rect.MinMaxRect(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
}
Bounds GetViewportBounds(Camera camera, Vector3 screenPosition1, Vector3 screenPosition2)
{
Vector3 v1 = camera.ScreenToViewportPoint(screenPosition1);
Vector3 v2 = camera.ScreenToViewportPoint(screenPosition2);
Vector3 min = Vector3.Min(v1, v2);
Vector3 max = Vector3.Max(v1, v2);
min.z = camera.nearClipPlane;
max.z = camera.farClipPlane;
Bounds bounds = new Bounds();
bounds.SetMinMax(min, max);
return bounds;
}
void DrawSelectionIndicator(Camera camera, Bounds bounds)
{
Vector3 boundPoint1 = bounds.min;
Vector3 boundPoint2 = bounds.max;
Vector3 boundPoint3 = new Vector3(boundPoint1.x, boundPoint1.y, boundPoint2.z);
Vector3 boundPoint4 = new Vector3(boundPoint1.x, boundPoint2.y, boundPoint1.z);
Vector3 boundPoint5 = new Vector3(boundPoint2.x, boundPoint1.y, boundPoint1.z);
Vector3 boundPoint6 = new Vector3(boundPoint1.x, boundPoint2.y, boundPoint2.z);
Vector3 boundPoint7 = new Vector3(boundPoint2.x, boundPoint1.y, boundPoint2.z);
Vector3 boundPoint8 = new Vector3(boundPoint2.x, boundPoint2.y, boundPoint1.z);
Vector2[] screenPoints = new Vector2[8];
screenPoints[0] = camera.WorldToScreenPoint(boundPoint1);
screenPoints[1] = camera.WorldToScreenPoint(boundPoint2);
screenPoints[2] = camera.WorldToScreenPoint(boundPoint3);
screenPoints[3] = camera.WorldToScreenPoint(boundPoint4);
screenPoints[4] = camera.WorldToScreenPoint(boundPoint5);
screenPoints[5] = camera.WorldToScreenPoint(boundPoint6);
screenPoints[6] = camera.WorldToScreenPoint(boundPoint7);
screenPoints[7] = camera.WorldToScreenPoint(boundPoint8);
Vector2 topLeftPosition = Vector2.zero;
Vector2 topRightPosition = Vector2.zero;
Vector2 bottomLeftPosition = Vector2.zero;
Vector2 bottomRightPosition = Vector2.zero;
for (int a = 0; a < screenPoints.Length; a++)
{
//Top Left
if (topLeftPosition.x == 0 || topLeftPosition.x > screenPoints[a].x)
{
topLeftPosition.x = screenPoints[a].x;
}
if (topLeftPosition.y == 0 || topLeftPosition.y > Screen.height - screenPoints[a].y)
{
topLeftPosition.y = Screen.height - screenPoints[a].y;
}
//Top Right
if (topRightPosition.x == 0 || topRightPosition.x < screenPoints[a].x)
{
topRightPosition.x = screenPoints[a].x;
}
if (topRightPosition.y == 0 || topRightPosition.y > Screen.height - screenPoints[a].y)
{
topRightPosition.y = Screen.height - screenPoints[a].y;
}
//Bottom Left
if (bottomLeftPosition.x == 0 || bottomLeftPosition.x > screenPoints[a].x)
{
bottomLeftPosition.x = screenPoints[a].x;
}
if (bottomLeftPosition.y == 0 || bottomLeftPosition.y < Screen.height - screenPoints[a].y)
{
bottomLeftPosition.y = Screen.height - screenPoints[a].y;
}
//Bottom Right
if (bottomRightPosition.x == 0 || bottomRightPosition.x < screenPoints[a].x)
{
bottomRightPosition.x = screenPoints[a].x;
}
if (bottomRightPosition.y == 0 || bottomRightPosition.y < Screen.height - screenPoints[a].y)
{
bottomRightPosition.y = Screen.height - screenPoints[a].y;
}
}
GUI.DrawTexture(new Rect(topLeftPosition.x - 16, topLeftPosition.y - 16, 16, 16), topLeftBorder);
GUI.DrawTexture(new Rect(topRightPosition.x, topRightPosition.y - 16, 16, 16), topRightBorder);
GUI.DrawTexture(new Rect(bottomLeftPosition.x - 16, bottomLeftPosition.y, 16, 16), bottomLeftBorder);
GUI.DrawTexture(new Rect(bottomRightPosition.x, bottomRightPosition.y, 16, 16), bottomRightBorder);
}
}
Stap 2: Stel de RTS-selectie in
- Maak een nieuw spelobject en noem het "_SelectionManager"
- Voeg het SC_SelectionManager-script toe aan het "_SelectionManager"-object
- Wijs onderstaande texturen toe aan randvariabelen:
- Sleep de objecten die je wilt selecteren naar de scène en zet ze daar neer (in mijn geval heb ik de modellen uit het RPG/FPS Game Assets for PC/Mobile Industrial Set v2.0-pakket uit het -pakket gebruikt =19])
- Voeg SC_Selectable-script toe aan elk model
- Wijs Mesh Renderer (of Mesh Renderers als er meerdere objecten zijn) toe aan de Renderers-array. Dit is nodig om de objectgrenzen te berekenen.
Druk nu op Afspelen en houd de muisknop ingedrukt om te beginnen met selecteren.
Beweeg over de selecteerbare Objecten om ze te selecteren.