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90 lines
3.0 KiB
90 lines
3.0 KiB
3 years ago
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/// <summary>
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/// Author: Lele Feng
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/// </summary>
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using UnityEngine;
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using System.Collections;
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public class ColorPicker : MonoBehaviour {
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public BoxCollider pickerCollider;
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private bool m_grab;
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private Camera m_camera;
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private Texture2D m_screenRenderTexture;
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private static Texture2D m_staticRectTexture;
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private static GUIStyle m_staticRectStyle;
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private static Vector3 m_pixelPosition = Vector3.zero;
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private Color m_pickedColor = Color.white;
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void Awake() {
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// Get the Camera component
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m_camera = GetComponent<Camera>();
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if (m_camera == null) {
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Debug.LogError("You need to dray this script to a camera!");
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return;
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}
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// Attach a BoxCollider to this camera
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// In order to receive mouse events
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if (pickerCollider == null) {
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pickerCollider = gameObject.AddComponent<BoxCollider>();
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// Make sure the collider is in the camera's frustum
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pickerCollider.center = Vector3.zero;
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pickerCollider.center += m_camera.transform.worldToLocalMatrix.MultiplyVector(m_camera.transform.forward) * (m_camera.nearClipPlane + 0.2f);
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pickerCollider.size = new Vector3(Screen.width, Screen.height, 0.1f);
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}
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}
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// Draw the color we picked
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public static void GUIDrawRect( Rect position, Color color )
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{
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if( m_staticRectTexture == null )
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{
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m_staticRectTexture = new Texture2D(1, 1);
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}
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if( m_staticRectStyle == null )
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{
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m_staticRectStyle = new GUIStyle();
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}
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m_staticRectTexture.SetPixel(0, 0, color);
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m_staticRectTexture.Apply();
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m_staticRectStyle.normal.background = m_staticRectTexture;
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GUI.Box(position, GUIContent.none, m_staticRectStyle);
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}
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// OnPostRender is called after a camera has finished rendering the scene.
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// This message is sent to all scripts attached to the camera.
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// Use it to grab the screen
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// Note: grabing is a expensive operation
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void OnPostRender() {
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if (m_grab) {
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m_screenRenderTexture = new Texture2D(Screen.width, Screen.height);
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m_screenRenderTexture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
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m_screenRenderTexture.Apply();
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m_pickedColor = m_screenRenderTexture.GetPixel(Mathf.FloorToInt(m_pixelPosition.x), Mathf.FloorToInt(m_pixelPosition.y));
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m_grab = false;
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}
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}
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void OnMouseDown() {
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m_grab = true;
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// Record the mouse position to pick pixel
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m_pixelPosition = Input.mousePosition;
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}
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void OnGUI() {
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GUI.Box(new Rect(0, 0, 120, 200), "Color Picker");
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GUIDrawRect(new Rect(20, 30, 80, 80), m_pickedColor);
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GUI.Label(new Rect(10, 120, 100, 20), "R: " + System.Math.Round((double)m_pickedColor.r, 4) + "\t(" + Mathf.FloorToInt(m_pickedColor.r * 255)+ ")");
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GUI.Label(new Rect(10, 140, 100, 20), "G: " + System.Math.Round((double)m_pickedColor.g, 4) + "\t(" + Mathf.FloorToInt(m_pickedColor.g * 255)+ ")");
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GUI.Label(new Rect(10, 160, 100, 20), "B: " + System.Math.Round((double)m_pickedColor.b, 4) + "\t(" + Mathf.FloorToInt(m_pickedColor.b * 255)+ ")");
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GUI.Label(new Rect(10, 180, 100, 20), "A: " + System.Math.Round((double)m_pickedColor.a, 4) + "\t(" + Mathf.FloorToInt(m_pickedColor.a * 255)+ ")");
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}
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}
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