Unity Brush

結果圖:

內容連結

Unity UI Canvas Draw

unity interface setting:

CanvasDraw(C#) :

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using UnityEngine.Events;

public class CanvasDraw : MonoBehaviour {

public static Texture2D CANVAS = null;  
public static RectTransform RCET_Transform; // rectTransform for unity ui
public static RawImage RAW_IMAGE; // rawImage for unity ui

// canvas size
int canvasWidth = Screen.width; 
  int canvasHeight = Screen.height;

void Awake(){

/***********************
* TODO Componet Setting
* Prior start Calculate
************************/

RAW_IMAGE = GetComponent<RawImage> ();
RCET_Transform = GetComponent<RectTransform> ();
RCET_Transform.anchoredPosition = new Vector2 (Screen.width / 2, Screen.height / 2);
}

// Use this for initialization
void Start () {

/*******************************
* TODO Create Canvas
* Unity UI When either Canvas
******************************/ 

CANVAS = new Texture2D (canvasWidth, canvasHeight);
Color[] color = new Color[CANVAS.width * CANVAS.height]; // Canvas pixel value in color array

for (int i = 0; i < color.Length; i++)  // read canvas value
color [i] = Color.white; // read canvas pixel color white

CANVAS.SetPixels (color); // write canvas setPixels
CANVAS.Apply (); // canvas Apply

RAW_IMAGE.texture = CANVAS; // canvas for rawimage

// Canvas SetSize
RCET_Transform.sizeDelta = new Vector2 (CANVAS.width, CANVAS.height);
RCET_Transform.pivot = new Vector2 (0.5f, 0.5f);
}

}

----------------------------------

TestPaint(C#) : 

using UnityEngine;

using System.Collections;

public class TestPaint : MonoBehaviour {

public Color paintColor = Color.red; // paint color

Vector2 oldSetPixelVector2; // after write pixel 

public float zoom = 1, rotation = 0;

// Update is called once per frame

void Update () {

/**********************************

* TODO Paint

* Mouset when either Paint

*********************************/

if(Input.GetMouseButton(0)){

if(CanvasDraw.CANVAS != null){

float offsetX = (CanvasDraw.RCET_Transform.anchoredPosition.x - (CanvasDraw.CANVAS.width * zoom)/2);

float OffsetY = (CanvasDraw.RCET_Transform.anchoredPosition.y - (CanvasDraw.CANVAS.height * zoom)/2);

float x = (Input.mousePosition.x - offsetX)/zoom;

float y = (Input.mousePosition.y - OffsetY)/zoom;

Vector2 v = RotateSquare(x, y, CanvasDraw.CANVAS.width, CanvasDraw.CANVAS.height, rotation/(180/Mathf.PI));

float dis =  Vector2.Distance(oldSetPixelVector2, v);

float split = 1/ dis;

if(!Input.GetMouseButtonDown(0)){

for(float i = 0; i<1; i+=split){

Vector2 paintSetPixel = Vector2.Lerp(oldSetPixelVector2, v, i); // Paint point x,y lerp

CanvasDraw.CANVAS.SetPixel((int)paintSetPixel.x, (int)paintSetPixel.y, paintColor); // Paint SetCanvas Pixel

}

}

CanvasDraw.CANVAS.Apply(); // canvas write pixel

oldSetPixelVector2 = v; // paint vector2D posistion

}

}

}

Vector2 RotateSquare(float X, float Y, int W, int H, float phi){

float sin = Mathf.Sin(phi), cos = Mathf.Cos(phi);

int xc = W/2, yc = H/2;

int x = (int)(cos*(X-xc)+sin*(Y-yc)+xc);

int y = (int)(-sin*(X-xc)+cos*(Y-yc)+yc);

return new Vector2(x, y);

}

}

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結果圖: