| /** |
| * Copyright 2018 Alibaba Group |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #import "EBJSEvaluate.h" |
| |
| @implementation EBJSEvaluate |
| |
| + (EBNativeFunction *)evaluateColor |
| { |
| return [[EBNativeFunction alloc] initWithBody:^(NSArray *arguments){ |
| |
| if (!arguments || arguments.count < 3) { |
| return @[]; |
| } |
| |
| NSString* startColor = [arguments[0] substringWithRange:NSMakeRange(2, 6)]; |
| NSString* endColor = [arguments[1] substringWithRange:NSMakeRange(2, 6)]; |
| double fraction = [arguments[2] doubleValue]; |
| if (fraction < 0) { |
| fraction = 0; |
| } else if(fraction > 1) { |
| fraction = 1; |
| } |
| |
| unsigned rgbValue = 0; |
| [[NSScanner scannerWithString:[@"0x" stringByAppendingString:startColor]] scanHexInt:&rgbValue]; |
| int sr = (rgbValue & 0xFF0000) >> 16; |
| int sg = (rgbValue & 0xFF00) >> 8; |
| int sb = rgbValue & 0xFF; |
| |
| |
| [[NSScanner scannerWithString:[@"0x" stringByAppendingString:endColor]] scanHexInt:&rgbValue]; |
| int er = (rgbValue & 0xFF0000) >> 16; |
| int eg = (rgbValue & 0xFF00) >> 8; |
| int eb = rgbValue & 0xFF; |
| |
| NSNumber* mr = [NSNumber numberWithInt:((er - sr)*fraction + sr)]; |
| NSNumber* mg = [NSNumber numberWithInt:((eg - sg)*fraction + sg)]; |
| NSNumber* mb = [NSNumber numberWithInt:((eb - sb)*fraction + sb)]; |
| |
| return @[mr,mg,mb]; |
| |
| }]; |
| } |
| |
| |
| |
| @end |
