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| using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
[RequireComponent(typeof(RawImage))]
[RequireComponent(typeof(RectTransform))]
public class ScratchCard : MonoBehaviour, IBeginDragHandler, IDragHandler
{
private static readonly int OffsetPropertyId = Shader.PropertyToID("_Offset");
private static readonly int ScalePropertyId = Shader.PropertyToID("_Scale");
internal RawImage RawImage
{
get
{
if (rawImage == null)
{
rawImage = GetComponent<RawImage>();
}
return rawImage;
}
}
internal RectTransform RectTransform
{
get
{
if (rectTransform == null)
{
rectTransform = GetComponent<RectTransform>();
}
return rectTransform;
}
}
[Header("Brush")]
public Material brushMaterial;
public Vector2 brushScale = new Vector2(0.25f, 0.25f);
public int interpolationMaxCount = 4;
public int interpolationMinDistance = 8;
[Header("MaskTexture")]
public float maskTextureScale = 10f;
public float maskTextureMaxSize = 1024f;
private RawImage rawImage;
private RectTransform rectTransform;
private Texture baseTexture;
private RenderTexture targetTexture;
private Material brush;
private Vector2 previousDrawPosition;
private void Awake()
{
SaveBaseTexture();
}
private void OnEnable()
{
Reload();
}
private void OnDisable()
{
DisposeTargetTexture();
DisposeBrush();
}
private void OnRectTransformDimensionsChange()
{
Reload();
}
public void OnBeginDrag(PointerEventData eventData)
{
previousDrawPosition = eventData.position;
}
public void OnDrag(PointerEventData eventData)
{
if (targetTexture == null || brush == null) return;
Vector2 drawPositon = eventData.position;
Vector2 delta = drawPositon - previousDrawPosition;
float distance = delta.magnitude;
int count = Mathf.Min(interpolationMaxCount, (int)distance / interpolationMinDistance);
for(int i = 1; i < count; i++)
{
DrawAt(previousDrawPosition + delta * ((float)i / count));
}
DrawAt(drawPositon);
previousDrawPosition = drawPositon;
}
public void Restory()
{
ClearTargetTexture();
}
private void SaveBaseTexture()
{
if (RawImage.texture != null)
{
baseTexture = RawImage.texture;
}
}
private void Reload()
{
Rect rect = RectTransform.rect;
if (rect.width <= 0 || rect.height <= 0) return;
AcquireTargetTexture(rect);
CreateBrush();
}
private void AcquireTargetTexture(Rect rect)
{
float aspect = rect.height / rect.width;
int width = (int)Mathf.Min(maskTextureMaxSize, rect.width * maskTextureScale);
int height = (int)(width * aspect);
if (targetTexture != null && (targetTexture.width != width || targetTexture.height != height))
{
DisposeTargetTexture();
}
targetTexture = RenderTexture.GetTemporary(width, height, -1, RenderTextureFormat.ARGB32);
RawImage.texture = targetTexture;
ClearTargetTexture();
}
private void DisposeTargetTexture()
{
if(targetTexture != null)
{
RenderTexture.ReleaseTemporary(targetTexture);
targetTexture = null;
}
}
private void ClearTargetWithColor(Color color)
{
RenderTexture temp = RenderTexture.active;
RenderTexture.active = targetTexture;
GL.Clear(true, true, color);
RenderTexture.active = temp;
}
private void ClearTargetTexture()
{
if(baseTexture != null)
{
ClearTargetWithColor(Color.clear);
Graphics.Blit(baseTexture, targetTexture, RawImage.material);
}
else
{
ClearTargetWithColor(Color.white);
}
}
private void CreateBrush()
{
if(brushMaterial == null)
{
brushMaterial = Resources.Load<Material>("Materials/ScratchCard_DefaultBrush");
}
DisposeBrush();
brush = new Material(brushMaterial);
}
private void DisposeBrush()
{
if(brush != null)
{
Destroy(brush);
brush = null;
}
}
private void DrawAt(Vector2 screenPoint)
{
Vector2 point = ScreenToGraphicLocalPoint(RawImage, screenPoint);
Vector4 offsetScale = CaculateOffsetScale(RectTransform, point, brushScale);
brush.SetVector(OffsetPropertyId, new Vector4(offsetScale.x, offsetScale.y));
brush.SetVector(ScalePropertyId, new Vector4(offsetScale.z, offsetScale.w));
Graphics.Blit(brush.mainTexture, targetTexture, brush);
}
private Vector2 ScreenToGraphicLocalPoint(Graphic graphic, Vector2 screenPoint)
{
Canvas canvas = graphic.canvas.rootCanvas;
Camera camera = canvas.renderMode == RenderMode.ScreenSpaceOverlay ? null : canvas.worldCamera;
RectTransform rectTransform = graphic.rectTransform;
return RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPoint, camera, out Vector2 localPoint) ? localPoint : default;
}
private Vector4 CaculateOffsetScale(RectTransform rectTransform, Vector2 localPoint, Vector2 brushScale)
{
Rect rect = rectTransform.rect;
localPoint += rectTransform.pivot * rect.size;
float aspect = rect.height / rect.width;
float sx = brushScale.x * aspect;
float sy = brushScale.y;
float px = (localPoint.x / rect.width) - (0.5f * sx);
float py = (localPoint.y / rect.height) - (0.5f * sy);
return new Vector4(px, py, 1.0f / sx, 1.0f / sy);
}
}
|