“压平”或“合并”石英 2D 画线

发布于 2024-10-12 04:48:18 字数 1981 浏览 2 评论 0原文

我试图弄清楚如何在 Quartz 2D 中展平或合并大量动态绘制的线条，

我在舞台上随着时间的推移绘制随机线条，每次向数组添加新的线条坐标并绘制数组（使用我的drawRect和我用计时器和setNeedDisplay在数组中推入一条新行，以准确地重绘所有先前的行加上新的行）

现在的问题：过了一会儿，它开始变得越来越慢，因为数组变得越来越慢>很长，所以我想我应该将坐标合并到平面图像或其他东西中，并清除数组以保持内存健康，但是我该怎么做？

这是我当前的工作流程：

呼叫计时器
[NSTimerchedTimerWithTimeInterval:0.1 target:selfselector:@selector(drawdrawdraw)userInfo:nil Repeats:YES];
刷新我的“drawdrawdraw”函数中的drawRect
-(void)drawdrawdraw{ [自行设置需要显示]； }

我的绘制矩形

-(void)drawRect:(CGRect)rect{
    viewContext = UIGraphicsGetCurrentContext();

    int 计数 = [mijnArray_r_x 计数];

    浮点 r_x = (浮点)(随机() % 768);
    [mijnArray_r_x insertObject:[NSNumber numberWithFloat:r_x] atIndex:count];

    浮点 r_y = (浮点)(随机() % 1004);
    [mijnArray_r_y insertObject:[NSNumber numberWithFloat:r_y] atIndex:count];

    浮点 r_w = (浮点)(随机() % 100);
    [mijnArray_r_w insertObject:[NSNumber numberWithFloat:r_w] atIndex:count];

    浮点 r_a = (浮点)(随机() % 100);
    [mijnArray_r_a insertObject:[NSNumber numberWithFloat:r_a] atIndex:count];


    CGContextSetLineWidth(viewContext, 2.0);
    CGContextSetStrokeColorWithColor(viewContext, [UIColor blackColor].CGColor);
    for (int k = 0; k <= 计数; k++) {

        float temp_x = [[mijnArray_r_x objectAtIndex: k] floatValue];
        float temp_y = [[mijnArray_r_y objectAtIndex: k] floatValue];
        float temp_w = [[mijnArray_r_w objectAtIndex: k] floatValue];
        float temp_a = [[mijnArray_r_a objectAtIndex: k] floatValue];

        CGPoint pointpointpoint = CGPointMake(temp_x, temp_y);
        CGPoint pointpointpointpoint = CGPointMake(temp_w, temp_a);
        CGContextMoveToPoint(viewContext, pointpointpoint.x, pointpointpoint.y);
        CGContextAddLineToPoint(viewContext, pointpointpoint.x - pointpointpointpoint.x, pointpointpoint.y + pointpointpointpoint.y);
        CGContextStrokePath(viewContext);
    }
} }

原文

I'm trying to figure out how you can flatten or merge alot of dynamicly drawn lines in Quartz 2D,

I'm drawing random lines over time on my stage, I add new line coordinates each time to an array and draw the array (with my drawRect and I push a new line in my array with a timer and a setNeedDisplay to acctually redraw all the previous lines plus the new one)

now the PROBLEM: after a while it starts to get slower and slower because the arrays are getting very long, so I though I should merge the coordinates into a flat image or something and clear the arrays to keep it memory healthy, but how do I do this?

This is my current workflow:

Call timer
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(drawdrawdraw) userInfo:nil repeats:YES];
Refresh the drawRect in my "drawdrawdraw" function
-(void)drawdrawdraw{
[self setNeedsDisplay];
}

my drawRect

-(void)drawRect:(CGRect)rect{
    viewContext = UIGraphicsGetCurrentContext();

    int count = [mijnArray_r_x count];

    float r_x = (float)(random() % 768);
    [mijnArray_r_x insertObject:[NSNumber numberWithFloat:r_x] atIndex:count];

    float r_y = (float)(random() % 1004);
    [mijnArray_r_y insertObject:[NSNumber numberWithFloat:r_y] atIndex:count];

    float r_w = (float)(random() % 100);
    [mijnArray_r_w insertObject:[NSNumber numberWithFloat:r_w] atIndex:count];

    float r_a = (float)(random() % 100);
    [mijnArray_r_a insertObject:[NSNumber numberWithFloat:r_a] atIndex:count];


    CGContextSetLineWidth(viewContext, 2.0);
    CGContextSetStrokeColorWithColor(viewContext, [UIColor blackColor].CGColor);
    for (int k = 0; k <= count; k++) {

        float temp_x = [[mijnArray_r_x objectAtIndex: k] floatValue];
        float temp_y = [[mijnArray_r_y objectAtIndex: k] floatValue];
        float temp_w = [[mijnArray_r_w objectAtIndex: k] floatValue];
        float temp_a = [[mijnArray_r_a objectAtIndex: k] floatValue];

        CGPoint pointpointpoint = CGPointMake(temp_x, temp_y);
        CGPoint pointpointpointpoint = CGPointMake(temp_w, temp_a);
        CGContextMoveToPoint(viewContext, pointpointpoint.x, pointpointpoint.y);
        CGContextAddLineToPoint(viewContext, pointpointpoint.x - pointpointpointpoint.x, pointpointpoint.y + pointpointpointpoint.y);
        CGContextStrokePath(viewContext);
    }
} }

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

画▽骨i 2024-10-19 04:48:18

您可以使用 UIGraphicsBeginImageContext() 将线条绘制到 UIImage 中。这样，绘制所需的时间将是恒定的，因为在每次迭代中，您仅将缓存的图像绘制为位图以及添加的新行。

- (void)drawRect:(CGRect)rect {
  [self.currentImage drawInRect:[self bounds]];
  UIGraphicsBeginImageContext([self bounds].size);
  CGContextRef cgContext = UIGraphicsGetCurrentContext();
  //Draw your lines into the cgContext here...
  self.currentImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
}

这假设您声明了 UIImage 类型的属性 currentImage。

You can draw your lines into a UIImage by using UIGraphicsBeginImageContext(). This way, the time needed to draw will be constant, because in each iteration you're only drawing the cached image as a bitmap and the new lines you add.

- (void)drawRect:(CGRect)rect {
  [self.currentImage drawInRect:[self bounds]];
  UIGraphicsBeginImageContext([self bounds].size);
  CGContextRef cgContext = UIGraphicsGetCurrentContext();
  //Draw your lines into the cgContext here...
  self.currentImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
}

This assumes that you have the property currentImage of type UIImage declared.

回复收藏 0 原文

~没有更多了~