RCTConvert+Transform.m
5.05 KB
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
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTConvert+Transform.h"
static const NSUInteger kMatrixArrayLength = 4 * 4;
@implementation RCTConvert (Transform)
+ (CGFloat)convertToRadians:(id)json
{
if ([json isKindOfClass:[NSString class]]) {
NSString *stringValue = (NSString *)json;
if ([stringValue hasSuffix:@"deg"]) {
CGFloat degrees = [[stringValue substringToIndex:stringValue.length - 3] floatValue];
return degrees * M_PI / 180;
}
if ([stringValue hasSuffix:@"rad"]) {
return [[stringValue substringToIndex:stringValue.length - 3] floatValue];
}
}
return [json floatValue];
}
+ (CATransform3D)CATransform3DFromMatrix:(id)json
{
CATransform3D transform = CATransform3DIdentity;
if (!json) {
return transform;
}
if (![json isKindOfClass:[NSArray class]]) {
RCTLogConvertError(json, @"a CATransform3D. Expected array for transform matrix.");
return transform;
}
if ([json count] != kMatrixArrayLength) {
RCTLogConvertError(json, @"a CATransform3D. Expected 4x4 matrix array.");
return transform;
}
for (NSUInteger i = 0; i < kMatrixArrayLength; i++) {
((CGFloat *)&transform)[i] = [RCTConvert CGFloat:json[i]];
}
return transform;
}
+ (CATransform3D)CATransform3D:(id)json
{
CATransform3D transform = CATransform3DIdentity;
if (!json) {
return transform;
}
if (![json isKindOfClass:[NSArray class]]) {
RCTLogConvertError(json, @"a CATransform3D. Did you pass something other than an array?");
return transform;
}
// legacy matrix support
if ([(NSArray *)json count] == kMatrixArrayLength && [json[0] isKindOfClass:[NSNumber class]]) {
RCTLogWarn(@"[RCTConvert CATransform3D:] has deprecated a matrix as input. Pass an array of configs (which can contain a matrix key) instead.");
return [self CATransform3DFromMatrix:json];
}
CGFloat zeroScaleThreshold = FLT_EPSILON;
for (NSDictionary *transformConfig in (NSArray<NSDictionary *> *)json) {
if (transformConfig.count != 1) {
RCTLogConvertError(json, @"a CATransform3D. You must specify exactly one property per transform object.");
return transform;
}
NSString *property = transformConfig.allKeys[0];
id value = transformConfig[property];
if ([property isEqualToString:@"matrix"]) {
transform = [self CATransform3DFromMatrix:value];
} else if ([property isEqualToString:@"perspective"]) {
transform.m34 = -1 / [value floatValue];
} else if ([property isEqualToString:@"rotateX"]) {
CGFloat rotate = [self convertToRadians:value];
transform = CATransform3DRotate(transform, rotate, 1, 0, 0);
} else if ([property isEqualToString:@"rotateY"]) {
CGFloat rotate = [self convertToRadians:value];
transform = CATransform3DRotate(transform, rotate, 0, 1, 0);
} else if ([property isEqualToString:@"rotate"] || [property isEqualToString:@"rotateZ"]) {
CGFloat rotate = [self convertToRadians:value];
transform = CATransform3DRotate(transform, rotate, 0, 0, 1);
} else if ([property isEqualToString:@"scale"]) {
CGFloat scale = [value floatValue];
scale = ABS(scale) < zeroScaleThreshold ? zeroScaleThreshold : scale;
transform = CATransform3DScale(transform, scale, scale, 1);
} else if ([property isEqualToString:@"scaleX"]) {
CGFloat scale = [value floatValue];
scale = ABS(scale) < zeroScaleThreshold ? zeroScaleThreshold : scale;
transform = CATransform3DScale(transform, scale, 1, 1);
} else if ([property isEqualToString:@"scaleY"]) {
CGFloat scale = [value floatValue];
scale = ABS(scale) < zeroScaleThreshold ? zeroScaleThreshold : scale;
transform = CATransform3DScale(transform, 1, scale, 1);
} else if ([property isEqualToString:@"translate"]) {
NSArray *array = (NSArray<NSNumber *> *)value;
CGFloat translateX = [array[0] floatValue];
CGFloat translateY = [array[1] floatValue];
CGFloat translateZ = array.count > 2 ? [array[2] floatValue] : 0;
transform = CATransform3DTranslate(transform, translateX, translateY, translateZ);
} else if ([property isEqualToString:@"translateX"]) {
CGFloat translate = [value floatValue];
transform = CATransform3DTranslate(transform, translate, 0, 0);
} else if ([property isEqualToString:@"translateY"]) {
CGFloat translate = [value floatValue];
transform = CATransform3DTranslate(transform, 0, translate, 0);
} else if ([property isEqualToString:@"skewX"]) {
CGFloat skew = [self convertToRadians:value];
transform.m21 = tanf(skew);
} else if ([property isEqualToString:@"skewY"]) {
CGFloat skew = [self convertToRadians:value];
transform.m12 = tanf(skew);
} else {
RCTLogError(@"Unsupported transform type for a CATransform3D: %@.", property);
}
}
return transform;
}
@end