Unity 裁剪_unity 头像裁剪

最近用unity在做一个照片编辑的功能，所以就从框架里提炼出了一下代码，弄了一个小demo，话不多说，直接看效果。用的上的代码自取

##简单说一下逻辑吧，脚本一共就两个，一个拖拽脚本，一个处理图像的脚本
#场景里的UI层级如下图

#唯一挂载的脚本里面的东西是这些，如下图。（ps：我懒就全用拖拽的方式了）

#处理逻辑的脚本，代码比较简单，对着项目运行一下，简单看看就全懂了，里面也有部分注释
能拿到Sprite自然能对Sprite做你想做的事情

using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class Cutting : MonoBehaviour
{

public Sprite selectPhoto;
public Transform Obj;
public Button clickBtn;
public Button okBtn;
public Material guideMat;
private float cutRangeWidth;
private float cutRangeHeight;
private float ratio = 0;
private string curState = "CutFreeButton";

public Image tempImage;
public Image showImg;

private DragScript ltDrag;
private DragScript rtDrag;
private DragScript lbDrag;
private DragScript rbDrag;
private DragScript cenDrag;


public Toggle cutFreeTog;
public Toggle cut23Tog;
public Toggle cut11Tog;
public Toggle cut34Tog;
public Toggle cut43Tog;

RectTransform rbRect;
RectTransform lbRect;
RectTransform rtRect;
RectTransform ltRect;
RectTransform cen;


private void Start()
{
    clickBtn.onClick.AddListener(ShowCut);
    okBtn.onClick.AddListener(SetCut);
    ltDrag = Obj.Find("CutEditorLT").gameObject.AddComponent<DragScript>();
    rtDrag = Obj.Find("CutEditorRT").gameObject.AddComponent<DragScript>();
    lbDrag = Obj.Find("CutEditorLB").gameObject.AddComponent<DragScript>();
    rbDrag = Obj.Find("CutEditorRB").gameObject.AddComponent<DragScript>();
    cenDrag = Obj.Find("CutEditorCen").gameObject.AddComponent<DragScript>();
    ltDrag.Draging += DragLT;
    rtDrag.Draging += DragRT;
    lbDrag.Draging += DragLB;
    rbDrag.Draging += DragRB;
    cenDrag.Draging += DragCen;

    cutFreeTog.onValueChanged.AddListener(CutFree);
    cut23Tog.onValueChanged.AddListener(Cut23);
    cut11Tog.onValueChanged.AddListener(Cut11);
    cut34Tog.onValueChanged.AddListener(Cut34);
    cut43Tog.onValueChanged.AddListener(Cut43);

    rbRect = Obj.Find("CutEditorRB").GetComponent<RectTransform>();
    lbRect = Obj.Find("CutEditorLB").GetComponent<RectTransform>();
    rtRect = Obj.Find("CutEditorRT").GetComponent<RectTransform>();
    ltRect = Obj.Find("CutEditorLT").GetComponent<RectTransform>();
    cen = Obj.Find("CutEditorCen").GetComponent<RectTransform>();
   
}

/// <summary>
/// 裁剪（进入裁剪界面，初始化数据，其实也没啥可初始化的）
/// </summary>
private void ShowCut()
{
    cutRangeWidth = tempImage.preferredWidth;
    cutRangeHeight = tempImage.preferredHeight;
    
    Obj.Find("GuideMask").GetComponent<RectTransform>().sizeDelta = new Vector2(cutRangeWidth, cutRangeHeight);

    Obj.Find("CutEditorLT").GetComponent<Image>().color = Color.red;
    Obj.Find("CutEditorRT").GetComponent<Image>().color = Color.red;
    Obj.Find("CutEditorLB").GetComponent<Image>().color = Color.red;
    Obj.Find("CutEditorRB").GetComponent<Image>().color = Color.red;

    CutFree(false);
}


private void CutFree(bool isSelect)
{
    ChangeButtonState("CutFreeButton");

    float width = cutRangeWidth;
    float height = cutRangeHeight;
    UpdateCen(width, height, Vector2.zero);
    
    ltRect.anchoredPosition = new Vector2(-width / 2, height / 2);
    rtRect.anchoredPosition = new Vector2(width / 2, height / 2);
    lbRect.anchoredPosition = new Vector2(-width / 2, -height / 2);
    rbRect.anchoredPosition = new Vector2(width / 2, -height / 2);
}

private void Cut23(bool isSelect)
{
    ChangeButtonState("Cut23Button");
    SetCutRate(2 / 3f);
}

private void Cut11(bool isSelect)
{
    ChangeButtonState("Cut11Button");
    SetCutRate(1 / 1f);
}

private void Cut34(bool isSelect)
{
    ChangeButtonState("Cut34Button");
    SetCutRate(3 / 4f);
}

private void Cut43(bool isSelect)
{
    ChangeButtonState("Cut43Button");
    SetCutRate(4 / 3f);
}

//设置比例
private void SetCutRate(float rate)
{
    float width;
    float height;
    if (cutRangeWidth / cutRangeHeight > rate)
    {
        height = cutRangeHeight;
        width = cutRangeHeight * rate;
    }
    else
    {
        width = cutRangeWidth;
        height = cutRangeWidth / rate;
    }
    ltRect.anchoredPosition = new Vector2(-width / 2, height / 2);
    rtRect.anchoredPosition = new Vector2(width / 2, height / 2);
    lbRect.anchoredPosition = new Vector2(-width / 2, -height / 2);
    rbRect.anchoredPosition = new Vector2(width / 2, -height / 2);
    UpdateCen(width, height, Vector2.zero);
}

//处理Toggle按钮时间,设定比例，只能按照规定比例更改大小
private void ChangeButtonState(string objName)
{
    if (curState == objName)
        return;
    if (!string.IsNullOrEmpty(curState))

    curState = objName;
    switch (curState)
    {
        case "CutFreeButton":
            ratio = 0;
            break;
        case "Cut23Button":
            ratio = 2 / 3f;
            break;
        case "Cut11Button":
            ratio = 1 / 1f;
            break;
        case "Cut34Button":
            ratio = 3 / 4f;
            break;
        case "Cut43Button":
            ratio = 4 / 3f;
            break;
    }
}


#region   拖动角标事件
private void DragRB(PointerEventData data)
{
    if (Input.touchCount > 1)
        return;

    //Vector2 delta = Input.GetTouch(0).deltaPosition;
    Vector2 delta = data.delta;
    if (ratio != 0)
    {
        if (Mathf.Abs(delta.x) > Mathf.Abs(delta.y))
        {
            delta.y = delta.x / ratio * -1;
        }
        else
        {
            delta.x = delta.y * ratio * -1;
        }
    }
    

    Vector2 oriPos = rbRect.anchoredPosition;
    rbRect.transform.position += (Vector3)delta;
    Vector2 endPos = rbRect.anchoredPosition;
    bool state = ratio == 0 ? true : false;
    if (endPos.x > cutRangeWidth / 2)
    {
        if (ratio == 0)
            endPos.x = cutRangeWidth / 2;
        else
            endPos = oriPos;
    }
    else if (endPos.x < ltRect.anchoredPosition.x + 150)
    {
        if (ratio == 0)
            endPos.x = ltRect.anchoredPosition.x + 150;
        else
            endPos = oriPos;
    }
    if (endPos.y > ltRect.anchoredPosition.y - 100)
    {
        if (ratio == 0)
            endPos.y = ltRect.anchoredPosition.y - 100;
        else
            endPos = oriPos;
    }
    else if (endPos.y < -cutRangeHeight / 2)
    {
        if (ratio == 0)
            endPos.y = -cutRangeHeight / 2;
        else
            endPos = oriPos;
    }
    rbRect.anchoredPosition = endPos;

    lbRect.anchoredPosition = new Vector2(lbRect.anchoredPosition.x, endPos.y);
    rtRect.anchoredPosition = new Vector3(endPos.x, rtRect.anchoredPosition.y);

    Vector2 pos = Vector2.Lerp(lbRect.anchoredPosition, rtRect.anchoredPosition, 0.5f);
    float width = rtRect.anchoredPosition.x - lbRect.anchoredPosition.x;
    float height = rtRect.anchoredPosition.y - lbRect.anchoredPosition.y;
    UpdateCen(width, height, pos);
}

private void DragLB(PointerEventData data)
{
    //禁止双手操作
    if (Input.touchCount > 1)
        return;

    //Vector2 delta = Input.GetTouch(0).deltaPosition;
    Vector2 delta = data.delta;
    
    if (ratio != 0)
    {
        if (Mathf.Abs(delta.x) > Mathf.Abs(delta.y))
        {
            delta.y = delta.x / ratio;
        }
        else
        {
            delta.x = delta.y * ratio;
        }
    }
    

    Vector2 oriPos = lbRect.anchoredPosition;
    lbRect.transform.position += (Vector3)delta;
    Vector2 endPos = lbRect.anchoredPosition;
    if (endPos.x < -cutRangeWidth / 2)
    {
        if (ratio == 0)
            endPos.x = -cutRangeWidth / 2;
        else
            endPos = oriPos;
    }
    else if (endPos.x > rtRect.anchoredPosition.x - 150)
    {
        if (ratio == 0)
            endPos.x = rtRect.anchoredPosition.x - 150;
        else
            endPos = oriPos;
    }
    if (endPos.y > rtRect.anchoredPosition.y - 100)
    {
        if (ratio == 0)
            endPos.y = rtRect.anchoredPosition.y - 100;
        else
            endPos = oriPos;
    }
    else if (endPos.y < -cutRangeHeight / 2)
    {
        if (ratio == 0)
            endPos.y = -cutRangeHeight / 2;
        else
            endPos = oriPos;
    }
    lbRect.anchoredPosition = endPos;

    ltRect.anchoredPosition = new Vector3(endPos.x, rtRect.anchoredPosition.y);
    rbRect.anchoredPosition = new Vector2(rtRect.anchoredPosition.x, endPos.y);

    Vector2 pos = Vector2.Lerp(ltRect.anchoredPosition, rbRect.anchoredPosition, 0.5f);
    float width = rbRect.anchoredPosition.x - ltRect.anchoredPosition.x;
    float height = ltRect.anchoredPosition.y - rbRect.anchoredPosition.y;
    UpdateCen(width, height, pos);
}

private void DragRT(PointerEventData data)
{
    if (Input.touchCount > 1)
        return;

    //Vector2 delta = Input.GetTouch(0).deltaPosition;
    Vector2 delta = data.delta;
    if (ratio != 0)
    {
        if (Mathf.Abs(delta.x) > Mathf.Abs(delta.y))
        {
            delta.y = delta.x / ratio;
        }
        else
        {
            delta.x = delta.y * ratio;
        }
    }

    Vector2 oriPos = rtRect.anchoredPosition;
    rtRect.transform.position += (Vector3)delta;
    Vector2 endPos = rtRect.anchoredPosition;
    if (endPos.x > cutRangeWidth / 2)
    {
        if (ratio == 0)
            endPos.x = cutRangeWidth / 2;
        else
            endPos = oriPos;
    }
    else if (endPos.x < lbRect.anchoredPosition.x + 150)
    {
        if (ratio == 0)
            endPos.x = lbRect.anchoredPosition.x + 150;
        else
            endPos = oriPos;
    }
    if (endPos.y < lbRect.anchoredPosition.y + 100)
    {
        if (ratio == 0)
            endPos.y = lbRect.anchoredPosition.y + 100;
        else
            endPos = oriPos;
    }
    else if (endPos.y > cutRangeHeight / 2)
    {
        if (ratio == 0)
            endPos.y = cutRangeHeight / 2;
        else
            endPos = oriPos;
    }
    rtRect.anchoredPosition = endPos;

    rbRect.anchoredPosition = new Vector3(endPos.x, lbRect.anchoredPosition.y);
    ltRect.anchoredPosition = new Vector2(lbRect.anchoredPosition.x, endPos.y);

    Vector2 pos = Vector2.Lerp(ltRect.anchoredPosition, rbRect.anchoredPosition, 0.5f);
    float width = rbRect.anchoredPosition.x - ltRect.anchoredPosition.x;
    float height = ltRect.anchoredPosition.y - rbRect.anchoredPosition.y;
    UpdateCen(width, height, pos);
}

private void DragLT(PointerEventData data)
{
    if (Input.touchCount > 1)
        return;

    //Vector2 delta = Input.GetTouch(0).deltaPosition;

    //Vector2 delta = Input.mouseScrollDelta;
    //Debug.Log(data.delta);
    Vector2 delta = data.delta;

    if (ratio != 0)
    {
        if (Mathf.Abs(delta.x) > Mathf.Abs(delta.y))
        {
            delta.y = delta.x / ratio * -1;
        }
        else
        {
            delta.x = delta.y * ratio * -1;
        }
    }

    Vector2 oriPos = ltRect.anchoredPosition;
    ltRect.transform.position += (Vector3)delta;
    Vector2 endPos = ltRect.anchoredPosition;
    if (endPos.x < -cutRangeWidth / 2)
    {
        if (ratio == 0)
            endPos.x = -cutRangeWidth / 2;
        else
            endPos = oriPos;
    }
    else if (endPos.x > rbRect.anchoredPosition.x - 150)
    {
        if (ratio == 0)
            endPos.x = rbRect.anchoredPosition.x - 150;
        else
            endPos = oriPos;
    }
    if (endPos.y < rbRect.anchoredPosition.y + 100)
    {
        if (ratio == 0)
            endPos.y = rbRect.anchoredPosition.y + 100;
        else
            endPos = oriPos;
    }
    else if (endPos.y > cutRangeHeight / 2)
    {
        if (ratio == 0)
            endPos.y = cutRangeHeight / 2;
        else
            endPos = oriPos;
    }
    ltRect.anchoredPosition = endPos;

    lbRect.anchoredPosition = new Vector2(endPos.x, rbRect.anchoredPosition.y);
    rtRect.anchoredPosition = new Vector3(rbRect.anchoredPosition.x, endPos.y);

    Vector2 pos = Vector2.Lerp(ltRect.anchoredPosition, rbRect.anchoredPosition, 0.5f);
    float width = rtRect.anchoredPosition.x - lbRect.anchoredPosition.x;
    float height = rtRect.anchoredPosition.y - lbRect.anchoredPosition.y;
    UpdateCen(width, height, pos);
}

private void DragCen(PointerEventData data)
{
    Transform cen = Obj.Find("CutEditorCen").transform;
    RectTransform cenRect = Obj.Find("CutEditorCen").transform.GetComponent<RectTransform>();

    //Debug.Log(cen.position);

    float x = cen.position.x + data.delta.x;
    float y = cen.position.y + data.delta.y;

    //做限定  防止中心框拖出图片框
    float cenX = Mathf.Clamp(x, tempImage.transform.position.x - cutRangeWidth * 0.5f + cenRect.rect.width * 0.5f, tempImage.transform.position.x + cutRangeWidth * 0.5f - cenRect.rect.width * 0.5f);
    float cenY = Mathf.Clamp(y, tempImage.transform.position.y - cutRangeHeight * 0.5f + cenRect.rect.height * 0.5f, tempImage.transform.position.y + cutRangeHeight * 0.5f - cenRect.rect.height * 0.5f);

    cen.position = new Vector2(cenX, cenY);

    Vector2 cenPos = cen.gameObject.GetComponent<RectTransform>().anchoredPosition;
    float width = rtRect.anchoredPosition.x - lbRect.anchoredPosition.x;
    float height = rtRect.anchoredPosition.y - lbRect.anchoredPosition.y;

    if (cenPos.x < (-cutRangeWidth + width) / 2)
        cenPos.x = (-cutRangeWidth + width) / 2;
    else if (cenPos.x > (cutRangeWidth - width) / 2)
        cenPos.x = (cutRangeWidth - width) / 2;
    if (cenPos.y < (-cutRangeHeight + height) / 2)
        cenPos.y = (-cutRangeHeight + height) / 2;
    else if (cenPos.y > (cutRangeHeight - height) / 2)
        cenPos.y = (cutRangeHeight - height) / 2;

    ltRect.anchoredPosition = new Vector2(cenPos.x - width / 2, cenPos.y + height / 2);
    rtRect.anchoredPosition = new Vector2(cenPos.x + width / 2, cenPos.y + height / 2);
    lbRect.anchoredPosition = new Vector2(cenPos.x - width / 2, cenPos.y - height / 2);
    rbRect.anchoredPosition = new Vector2(cenPos.x + width / 2, cenPos.y - height / 2);

    UpdateGuide(width, height, cenPos);
}

#endregion


//更新中心点坐标
private void UpdateCen(float width, float height, Vector2 pos)
{
    var cen = Obj.Find("CutEditorCen").GetComponent<RectTransform>();
    cen.sizeDelta = new Vector2(width, height);
    cen.anchoredPosition = pos;

    UpdateGuide(width, height, cen.anchoredPosition);
}

//更新遮罩信息
private void UpdateGuide(float width, float height, Vector2 rectPos)
{
    guideMat.SetFloat("_Width", width);
    guideMat.SetFloat("_Height", height);
    guideMat.SetVector("_Center", new Vector4(rectPos.x, rectPos.y , 0, 0));
}

/// <summary>
/// 确认裁剪
/// </summary>
private void SetCut()
{
    float rate = 1;
    if (selectPhoto.texture.width / selectPhoto.texture.height >= 1f)
    {
        rate = selectPhoto.texture.height / cutRangeHeight;
    }
    else
    {
        rate = selectPhoto.texture.width / cutRangeWidth;
    }

    RectTransform lt = Obj.Find("CutEditorLT").GetComponent<RectTransform>();
    RectTransform rb = Obj.Find("CutEditorRB").GetComponent<RectTransform>();
    RectTransform cen =Obj.Find("CutEditorCen").GetComponent<RectTransform>();
    float width = (rb.anchoredPosition.x - lt.anchoredPosition.x) * rate;
    float height = (lt.anchoredPosition.y - rb.anchoredPosition.y) * rate;
    Vector2 cenPos = new Vector2(cen.anchoredPosition.x * rate + selectPhoto.texture.width / 2, cen.anchoredPosition.y * rate + selectPhoto.texture.height / 2);
    //InitProject.Instance.StartDoCoroutine(ProjectBehaviour.Instence.CutSprite(selectPhoto, Mathf.CeilToInt(width), Mathf.CeilToInt(height), cenPos, (result) =>
    //{
    //    ScreenAdaptation(result);
    //}));
    CutSprite(selectPhoto, Mathf.CeilToInt(width), Mathf.CeilToInt(height), cenPos, UpdataImage);

}


public void CutSprite(Sprite oriSprite, int width, int height, Vector2 center, Action<Sprite> finishedCB = null)
{
    Texture2D newTexture = new Texture2D(Mathf.CeilToInt(width), Mathf.CeilToInt(height));


    //遍历写入像素的过程
    int start_X = (int)(center.x - width / 2);
    start_X = start_X > 0 ? start_X : 1;
    int start_Y = (int)(center.y - height / 2);
    start_Y = start_Y > 0 ? start_Y : 1;
    int end_X = (int)(center.x + width / 2);
    end_X = end_X < oriSprite.rect.width ? end_X : (int)oriSprite.rect.width;
    int end_Y = (int)(center.y + height / 2);
    end_Y = end_Y < oriSprite.rect.height ? end_Y : (int)oriSprite.rect.height;
    
    for (int y = start_Y - 1; y < end_Y; y++)
    {
        for (int x = start_X - 1; x < end_X; x++)
        {
            Color color = oriSprite.texture.GetPixel(x, y);
            newTexture.SetPixel(x - start_X + 1, y - start_Y + 1, color);
        }
    }

    newTexture.anisoLevel = 2;
    newTexture.Apply();
    Sprite result = Sprite.Create(newTexture, new Rect(0, 0, newTexture.width, newTexture.height), new Vector2(0.5f, 0.5f));
    finishedCB?.Invoke(result);
}

public void UpdataImage(Sprite sprite)
{
    showImg.sprite = sprite;
    showImg.SetNativeSize();
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547

}

#拖动脚本，需要挂载到四个角标和中心图片上的

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class DragScript : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler
{

    public Action<PointerEventData> BeginDrag;
    public Action<PointerEventData> EndDrag;
    public Action<PointerEventData> Draging;


    public void OnBeginDrag(PointerEventData eventData)
    {
        BeginDrag?.Invoke(eventData);
    }

    public void OnDrag(PointerEventData eventData)
    {
        Draging?.Invoke(eventData);
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        EndDrag?.Invoke(eventData);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

工程地址，用的自取
链接：https://pan.baidu.com/s/1d4sKndjHJvmnWoT5nOZ8pA
提取码：tshm