ios - 使用drawRect绘制可编辑的角度？

我正在尝试创建一个应用程序，该应用程序由用户每3次点击绘制一次角度。每个抽头创建角度点并将其连接。

这很简单。但是，现在我试图使这些角度可编辑，并且变得越来越困难。当我完成3次敲击和touchesEnded调用后，我将这三个点添加到名为segment的NSObject子类中，该子类具有三个属性firstPoint，secondPoint和thirdPoint，并精确地存储该属性。

然后，我将“段”对象添加到数组中。每当touchesBegan被调用时，我就会进入数组的for循环。如果抽头位于“段”对象的3个CG点中的任意25个像素之内，则我不会绘制新角度，而是编辑该角度。

据我所知，到目前为止，还没有任何问题或错误，感谢你们!我只是在检查常规改进/简化之处，以保持当前使用的方法。我希望我能给所有人以赏金，因为你们所有人都非常有帮助!

这是我迄今为止最大的项目，我将不胜感激。如果您愿意并且可以应付的话，这是一个非常好的挑战。 IMMENSELY 非常感谢您的帮助。如果您能想到一种更好的方式来处理我要完成的任务，请让我知道!

注意:要绘制，只需在屏幕上点击/单击即可。

这是最相关的代码:

drawingsubclass.m

#import "SegmentDraw.h"
#import <QuartzCore/QuartzCore.h>

BOOL editing1 = FALSE;
BOOL editing2 = FALSE;
BOOL editing3 = FALSE;
BOOL erased = FALSE;
int radius = 35;
int handleSize = 20;

@implementation SegmentDraw {
    UIImage *incrementalImage;
}
@synthesize first;
@synthesize second;
@synthesize third;

- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        [self setMultipleTouchEnabled:NO];
        [self setBackgroundColor:[UIColor clearColor]];

        first = CGPointZero;
        second = CGPointZero;
        third = CGPointZero;
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];

    CGPoint point = [touch locationInView:self];

    for (Segment *currentSegment in self.tapArray) {

        int xDistance = abs(point.x - currentSegment.firstPoint.x);
        int yDistance = abs(point.y - currentSegment.firstPoint.y);
        int firstDistance = sqrtf(xDistance * xDistance + yDistance * yDistance);

        int xDistance2 = abs(point.x - currentSegment.secondPoint.x);
        int yDistance2 = abs(point.y - currentSegment.secondPoint.y);
        int secondDistance = sqrtf(xDistance2 * xDistance2 + yDistance2 * yDistance2);

        int xDistance3 = abs(point.x - currentSegment.thirdPoint.x);
        int yDistance3 = abs(point.y - currentSegment.thirdPoint.y);
        int thirdDistance = sqrtf(xDistance3 * xDistance3 + yDistance3 * yDistance3);

        if (firstDistance <= radius) {
            NSLog(@"First point matches");
            editing1 = TRUE;
            editing2 = FALSE;
            editing3 = FALSE;
            first = point;
            second = currentSegment.secondPoint;
            third = currentSegment.thirdPoint;
            self.segmentBeingEdited = currentSegment;
            [self setNeedsDisplay];
            [self drawBitmap];
            erased = FALSE;
            return;
        }
        else if (secondDistance <= radius) {
            NSLog(@"Second point matches");
            editing2 = TRUE;
            editing1 = FALSE;
            editing3 = FALSE;
            first = currentSegment.firstPoint;
            second = point;
            third = currentSegment.thirdPoint;
            self.segmentBeingEdited = currentSegment;
            [self setNeedsDisplay];
            [self drawBitmap];
            erased = FALSE;
            return;
        }
        else if (thirdDistance <= radius) {
            NSLog(@"Third point matches");
            editing3 = TRUE;
            editing1 = FALSE;
            editing2 = FALSE;
            first = currentSegment.firstPoint;
            second = currentSegment.secondPoint;
            third = point;
            self.segmentBeingEdited = currentSegment;
            [self setNeedsDisplay];
            [self drawBitmap];
            erased = FALSE;
            return;
        }
        else {
            editing1 = FALSE;
            editing2 = FALSE;
            editing3 = FALSE;
        }
    }

    if (CGPointEqualToPoint(first, CGPointZero)) {
        first = [touch locationInView:self];
    }
    else if (!CGPointEqualToPoint(first, CGPointZero) && CGPointEqualToPoint(second, CGPointZero)) {
        second = [touch locationInView:self];
    }
    else if (!CGPointEqualToPoint(first, CGPointZero) && !(CGPointEqualToPoint(second, CGPointZero)) && CGPointEqualToPoint(third, CGPointZero)) {
        third = [touch locationInView:self];
    }
    else {
        //[self drawBitmap];
        first = [touch locationInView:self];
        second = CGPointZero;
        third = CGPointZero;
    }

    [self setNeedsDisplay];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];

    CGPoint point = [touch locationInView:self];

    for (Segment *currentSegment in self.tapArray) {
        if (editing1) {
            editing2 = FALSE;
            editing3 = FALSE;
            first = point;
            second = self.segmentBeingEdited.secondPoint;
            third = self.segmentBeingEdited.thirdPoint;
            //self.segmentBeingEdited = currentSegment;
            if (erased == FALSE) {
                [self drawBitmap];
                //      NSLog(@"YOU NEED TO ERASE.");
            }
            [self setNeedsDisplay];
            return;
        }
        else if (editing2) {
            editing1 = FALSE;
            editing3 = FALSE;
            first = self.segmentBeingEdited.firstPoint;
            second = point;
            third = self.segmentBeingEdited.thirdPoint;
            //self.segmentBeingEdited = currentSegment;
            if (erased == FALSE) {
                [self drawBitmap];
                //    NSLog(@"YOU NEED TO ERASE.");
            }
            [self setNeedsDisplay];
            return;
        }
        else if (editing3) {
            //       NSLog(@"It's editing time, yo");
            editing1 = FALSE;
            editing2 = FALSE;
            first = self.segmentBeingEdited.firstPoint;
            second = self.segmentBeingEdited.secondPoint;
            third = point;
            //self.segmentBeingEdited = currentSegment;
            if (erased == FALSE) {
                [self drawBitmap];
                //             NSLog(@"YOU NEED TO ERASE.");
            }
            [self setNeedsDisplay];
            return;
        }
        else {
            editing1 = FALSE;
            editing2 = FALSE;
            editing3 = FALSE;
        }
    }

    if (!CGPointEqualToPoint(first, CGPointZero) && CGPointEqualToPoint(second, CGPointZero)) {
        first = [touch locationInView:self];
    }
    else if (!CGPointEqualToPoint(first, CGPointZero) && !(CGPointEqualToPoint(second, CGPointZero)) && CGPointEqualToPoint(third, CGPointZero)) {
        second = [touch locationInView:self];
    }
    else if (!CGPointEqualToPoint(first, CGPointZero) && !(CGPointEqualToPoint(second, CGPointZero)) && !(CGPointEqualToPoint(third, CGPointZero))) {
        third = [touch locationInView:self];
    }
    else {
        first = [touch locationInView:self];
        second = CGPointZero;
        third = CGPointZero;
    }

    [self setNeedsDisplay];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSUInteger index;
    if (editing1 || editing2 || editing3) {
        index = [self.tapArray indexOfObject:self.segmentBeingEdited];
        Segment *datSegment = [self.tapArray objectAtIndex:index];
        datSegment.firstPoint = first;
        datSegment.secondPoint = second;
        datSegment.thirdPoint = third;
    }


    if (!CGPointEqualToPoint(third, CGPointZero) && editing1 == FALSE && editing2 == FALSE && editing3 == FALSE) {
        Segment *segment = [[Segment alloc] init];
        segment.firstPoint = first;
        segment.secondPoint = second;
        segment.thirdPoint = third;

        if (self.tapArray == nil) {
            self.tapArray = [[NSMutableArray alloc] init];
        }

        [self.tapArray addObject:segment];
    }

    editing1 = FALSE;
    editing2 = FALSE;
    editing3 = FALSE;
    erased = FALSE;

    [self drawBitmap];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
}

- (void)drawRect:(CGRect)rect {
    [incrementalImage drawInRect:rect];
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
    CGContextSetLineWidth(context, 5.0);
    CGContextSetLineCap(context, kCGLineCapRound);
    CGContextSetLineJoin(context, kCGLineJoinRound);

    if (!CGPointEqualToPoint(first, CGPointZero)) {
        CGRect rectangle = CGRectMake(first.x - 10, first.y - 10, handleSize, handleSize);
        CGContextAddEllipseInRect(context, rectangle);
        CGContextMoveToPoint(context, first.x, first.y);

        if (!CGPointEqualToPoint(second, CGPointZero)) {
            CGContextAddLineToPoint(context, second.x, second.y);
            CGRect rectangle2 = CGRectMake(second.x - 10, second.y - 10, handleSize, handleSize);
            CGContextAddEllipseInRect(context, rectangle2);
            CGContextMoveToPoint(context, second.x, second.y);
        }

        if (!CGPointEqualToPoint(third, CGPointZero)) {
            CGContextAddLineToPoint(context, third.x, third.y);
            CGRect rectangle3 = CGRectMake(third.x - 10, third.y - 10, handleSize, handleSize);
            CGContextAddEllipseInRect(context, rectangle3);
        }

        CGContextStrokePath(context);
    }
}

- (void)drawBitmap {
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0.0);

    if (!incrementalImage) { // first draw;
        UIBezierPath *rectpath = [UIBezierPath bezierPathWithRect:self.bounds]; // enclosing bitmap by a rectangle defined by another UIBezierPath object
        [[UIColor clearColor] setFill];
        [rectpath fill]; // fill it
    }
    [incrementalImage drawAtPoint:CGPointZero];

    CGContextRef context = UIGraphicsGetCurrentContext();


    CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
    CGContextSetLineWidth(context, 5.0);
    CGContextSetLineCap(context, kCGLineCapRound);
    CGContextSetLineJoin(context, kCGLineJoinRound);

    if (editing1 || editing2 || editing3) {
        //    CGContextBeginTransparencyLayer(context, NULL);
        CGContextSetBlendMode(context, kCGBlendModeClear);
        CGContextSetLineWidth(context, 6.0);
        //CGContextSetBlendMode(context, kCGBlendModeColor);

        if (!CGPointEqualToPoint(self.segmentBeingEdited.firstPoint, CGPointZero)) {
            CGContextMoveToPoint(context, self.segmentBeingEdited.firstPoint.x, self.segmentBeingEdited.firstPoint.y);

            if (!CGPointEqualToPoint(self.segmentBeingEdited.secondPoint, CGPointZero)) {
                CGContextAddLineToPoint(context, self.segmentBeingEdited.secondPoint.x, self.segmentBeingEdited.secondPoint.y);
            }

            if (!CGPointEqualToPoint(self.segmentBeingEdited.thirdPoint, CGPointZero)) {
                CGContextAddLineToPoint(context, self.segmentBeingEdited.thirdPoint.x, self.segmentBeingEdited.thirdPoint.y);
            }

            CGContextStrokePath(context);
            //      CGContextEndTransparencyLayer(context);
        }

        incrementalImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        erased = TRUE;
        return;
    }

    CGContextSetBlendMode(context, kCGBlendModeNormal);


    if (!CGPointEqualToPoint(first, CGPointZero)) {
        CGContextMoveToPoint(context, first.x, first.y);

        if (!CGPointEqualToPoint(second, CGPointZero)) {
            CGContextAddLineToPoint(context, second.x, second.y);
        }

        if (!CGPointEqualToPoint(third, CGPointZero)) {
            CGContextAddLineToPoint(context, third.x, third.y);
        }

        CGContextStrokePath(context);
    }

    incrementalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
}

@end

回顾一下，我想绘制一些角度，然后能够通过点击我要编辑的角度的3个点中的任意一个来编辑它们。然后通过拖动，将角度编辑为延伸到分接头当前所在的位置。只是想使其更好/更简单。任何意见/见解欢迎!

最佳答案

您没有正确处理编辑标志。您拨打touchesBegan:

        if(yDistance2 <= 25 || editing){
            NSLog(@"It's editing time, yo");
            editing = TRUE; // Here's your problem

这意味着在touchesMoved中，当您点击时:

if(xDistance <= 25 || editing) // Note the "Or editing"

editing等于true，这意味着它将移动点1，因为它首先命中了if语句，无论设置哪一点。

结论

您需要为每个点使用特定的编辑标记。不是共享的。至少没有or检查。或者更好的是，更好地处理touchesMoved。您几乎不需要完全复制touchesBegan中的代码

边注

尽管与您的问题不完全相关，但我相信您还在if语句中交换point2和point3。在检查xDistance2时:

else if(xDistance2 <= 25 || editing){
            NSLog(@"X is pretty close");
            if(yDistance2 <= 25 || editing){
                NSLog(@"It's editing time, yo");
                editing = TRUE;
                first = currentSegment.firstPoint;
                second = currentSegment.secondPoint;
                third = point; // <- Why are you setting third to point and not second to point.
                self.segmentBeingEdited = currentSegment;
                [self setNeedsDisplay];
                return;
            }
    }

当您检查XDistance3时也是如此。您将第二点设置为点，而不是第三点。

关于ios - 使用drawRect绘制可编辑的角度？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/20772052/