iphone - 'annot' CGPDFDictionary 'Rect' 如何转换为 objective-c Rect

Question

'annot' CGPDFDictionary 'Rect' 如何转换为 objective-c Rect:

Answer 1

Adobes PDF Spec状态:

Rectangles are used to describe locations on a page and bounding boxes for a variety of objects. A rectangle shall be written as an array of four numbers giving the coordinates of a pair of diagonally opposite corners.

Although rectangles are conventionally specified by their lower-left and upper-right corners, it is acceptable to specify any two diagonally opposite corners. Applications that process PDF should be prepared to normalize such rectangles in situations where specific corners are required. Typically, the array takes the form [llx lly urx ury] specifying the lower-left x, lower-left y, upper-right x, and upper-right y coordinates of the rectangle, in that order. The other two corners of the rectangle are then assumed to have coordinates (llx, ury) and (urx, lly).

因此，这意味着 rect 翻译不是本地的，如图所示 here应该是这样的:

CGRect rect = CGRectMake(coords[0],coords[3],coords[2]-coords[0],coords[3]-coords[1]);

查看代码 Bellow(由 BrainFeeder 提供的原始代码)以查看 coords 数组的上下文:

CGPDFArrayRef rectArray;
                if(CGPDFDictionaryGetArray(annotDict, "Rect", &rectArray)) {
                    //continue;

                    CGPDFReal coords[4];

                    for( int k = 0; k < arrayCount; ++k ) {

                        CGPDFObjectRef rectObj;
                        if(!CGPDFArrayGetObject(rectArray, k, &rectObj)) {
                            continue;
                        }

                        CGPDFReal coord;
                        if(!CGPDFObjectGetValue(rectObj, kCGPDFObjectTypeReal, &coord)) {
                            continue;
                        }

                        coords[k] = coord;
                    }      

                }

                //blx,bly,trx,try>tlx,tly,w,h

                CGRect rect = CGRectMake(coords[0],coords[3],coords[2]-coords[0],coords[3]-coords[1]);