编码iphone图像绘制线
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大家好，我是法国人，所以请为我的英语打扰。所以我想做一个像飞行控制这样的游戏。当我从像飞机这样的图像中绘制一条线时，我希望该飞机沿着那条线前进。我该怎么做？
没有找到相关结果
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玖料萄
，，，，并使用接触点构建路径（CGPathRef）。 要使对象沿直线移动，请创建CAKeyframeAnimation，设置路径并将其分配给对象的图层。 编辑：示例代码 当您拥有时，创建动画就很容易：最后，将动画分配给图层：编辑2：示例应用程序： 我为您构建了一个名为PathAnimation的整个项目。 编辑3：这是我在PathAnimation项目中使用的代码：// // CustomView.m // PathAnimation // // Created by Dominique d\'Argent on 19.04.11. // Copyright 2011 Nicky Nubbel. All rights reserved. // #import \"CustomView.h\" @implementation CustomView - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { object = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@\"arrow\"]]; object.frame = CGRectMake(10.0, 30.0, 20.0, 20.0); [self addSubview:object]; [self createPath]; } return self; } - (void)dealloc { [object release]; [super dealloc]; } #pragma mark - Custom drawing // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { CGContextRef g = UIGraphicsGetCurrentContext(); CGFloat bgColor[4] = {1.0f, 1.0f, 1.0f, 1.0f}; CGContextSetFillColor(g, bgColor); CGContextFillRect(g, self.frame); CGFloat color[4] = {1.0f, 0.0f, 0.0f, 1.0f}; CGContextAddPath(g,path); CGContextSetStrokeColor(g, color); CGContextDrawPath(g, kCGPathStroke); CGPoint position = CGPathGetCurrentPoint(path); CGContextAddArc(g, position.x, position.y, 5.0f, 0.0f, 2 * M_PI, 0); CGContextSetFillColor(g, color); CGContextDrawPath(g, kCGPathFill); } #pragma mark - Path creation - (void)createPath { path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, object.center.x, object.center.y); } #pragma mark - Touch handling - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint position = [touch locationInView:self]; if (CGRectContainsPoint(object.frame, position)) { // start animation [self go]; } else { CGPoint lastPosition = CGPathGetCurrentPoint(path); if (CGPointEqualToPoint(lastPosition, object.center)) { CGFloat angle = -atan2f(position.x - lastPosition.x, position.y - lastPosition.y); angle += M_PI_2; object.layer.transform = CATransform3DMakeRotation(angle, 0.0, 0.0, 1.0); } CGPathAddLineToPoint(path, NULL, position.x, position.y); [self setNeedsDisplay]; } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { } #pragma mark - Animations - (void) go { NSLog(@\"go\"); object.layer.transform = CATransform3DIdentity; CAKeyframeAnimation* animation = [CAKeyframeAnimation animation]; animation.path = path; animation.duration = 5.0; animation.rotationMode = kCAAnimationRotateAuto; // object auto rotates to follow the path animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; [object.layer addAnimation:animation forKey:@\"position\"]; object.center = CGPathGetCurrentPoint(path); [self createPath]; } @end