如何使用可可拉伸来调整NSImage的大小
我正在开发摄影应用程序。因为我需要为NSImage创建框架，我已经使用了这样的绘图
NSImage *fg_img = [[NSImage alloc]initWithData:[NSData dataWithContentsOfFile:filepath]];
//NSData *imageData1 = [NSData dataWithContentsOfURL: [NSURL encryptedFileURLWithPath:str]] ;
NSImage *bg_img = [[NSImage alloc]initWithContentsOfURL:[NSURL encryptedFileURLWithPath:str]];
NSImage *newImage ;
NSRect imageRect = NSMakeRect(0,0, fg_img.size.width+fg_img.size.width/5, fg_img.size.height+fg_img.size.height/5);
newImage = [[NSImage alloc] initWithSize: NSMakeSize(imageRect.size.width,imageRect.size.height)];
NSRect fgrect = NSMakeRect(imageRect.size.width*0.03,imageRect.size.height*0.04, imageRect.size.width-imageRect.size.width/15.5, imageRect.size.height-imageRect.size.height/12);
[newImage lockFocus];
[fg_img drawInRect:fgrect fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
[bg_img drawInRect:imageRect fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
[newImage unlockFocus];
但不清楚..
原始帧图像
当我缩放它时输出是
在上图中，当我调整帧图像的大小时，帧的宽度发生了变化。 我需要在缩放时不改变帧图像的宽度。
更新
但您的代码显示如下
如果我给大图片，基本图像会变得很薄
3 个答案:
答案 0 :(得分：2)
我认为你正在寻找九部分形象。 九部分图像仅垂直调整左右侧的大小， 顶部和底部仅水平，中心是独立调整大小的轴，角不调整大小。
_____________
|c | hor | c|
|__|______|__|
| | | |
|v | axes |v |
|e |indep.|e |
|r | |r |
|__|______|__|
|c | hor |c |
|__|______|__|
Apple有一种方法可以帮助您绘制这样的图像：NSDrawNinePartImage here
但它需要准备好图像。
初始化代码如下：
static NSImage *baseImage = NULL;
static NSImage *topLeftCornerImage;
static NSImage *topEdgeImage;
static NSImage *topRightCornerImage;
static NSImage *leftEdgeImage;
static NSImage *centerImage;
static NSImage *rightEdgeImage;
static NSImage *bottomLeftCornerImage;
static NSImage *bottomEdgeImage;
static NSImage *bottomRightCornerImage;
+ (void)initialize;
{
if (baseImage) return;
//46x46
baseImage = [NSImage imageNamed:@"badge.png"];
topLeftCornerImage = [[NSImage alloc] initWithSize:NSMakeSize(22, 22)];
[topLeftCornerImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,22,22)
fromRect:NSMakeRect(0.0,24,22,22)
operation:NSCompositeCopy fraction:1.0];
[topLeftCornerImage unlockFocus];
topEdgeImage = [[NSImage alloc] initWithSize:NSMakeSize(2, 22)];
[topEdgeImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,2,22)
fromRect:NSMakeRect(22,24,2,22)
operation:NSCompositeCopy fraction:1.0];
[topEdgeImage unlockFocus];
topRightCornerImage = [[NSImage alloc] initWithSize:NSMakeSize(22, 22)];
[topRightCornerImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,22,22)
fromRect:NSMakeRect(24,24,22,22)
operation:NSCompositeCopy fraction:1.0];
[topRightCornerImage unlockFocus];
leftEdgeImage = [[NSImage alloc] initWithSize:NSMakeSize(22, 2)];
[leftEdgeImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,22,2)
fromRect:NSMakeRect(0,22,22,2)
operation:NSCompositeCopy fraction:1.0];
[leftEdgeImage unlockFocus];
centerImage = [[NSImage alloc] initWithSize:NSMakeSize(2, 2)];
[centerImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,2,2)
fromRect:NSMakeRect(22,22,2,2)
operation:NSCompositeCopy fraction:1.0];
[centerImage unlockFocus];
rightEdgeImage = [[NSImage alloc] initWithSize:NSMakeSize(22, 2)];
[rightEdgeImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,22,2)
fromRect:NSMakeRect(24,24,22,2)
operation:NSCompositeCopy fraction:1.0];
[rightEdgeImage unlockFocus];
bottomLeftCornerImage = [[NSImage alloc] initWithSize:NSMakeSize(22, 22)];
[bottomLeftCornerImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,22,22)
fromRect:NSMakeRect(0,0,22,22)
operation:NSCompositeCopy fraction:1.0];
[bottomLeftCornerImage unlockFocus];
bottomEdgeImage = [[NSImage alloc] initWithSize:NSMakeSize(2, 22)];
[bottomEdgeImage lockFocus];
[baseImage drawInRect:NSMakeRect(0, 0, 2, 22)
fromRect:NSMakeRect(22, 0, 2, 22)
operation:NSCompositeCopy fraction:1.0];
[bottomEdgeImage unlockFocus];
bottomRightCornerImage = [[NSImage alloc] initWithSize:NSMakeSize(22, 22)];
[bottomRightCornerImage lockFocus];
[baseImage drawInRect:NSMakeRect(0,0,22,22)
fromRect:NSMakeRect(24,0,22,22)
operation:NSCompositeCopy fraction:1.0];
[bottomRightCornerImage unlockFocus];
}
drawingCode：
NSDrawNinePartImage([self bounds],
topLeftCornerImage, topEdgeImage, topRightCornerImage,
leftEdgeImage, centerImage, rightEdgeImage,
bottomLeftCornerImage, bottomEdgeImage, bottomRightCornerImage,
NSCompositeSourceOver, 1.0, NO);
这是我基于CALayer的九部分图像实现的另一个例子 - NinePartLayer。
NinePartLayer.h
#import <Foundation/Foundation.h>
@interface NinePartLayer : CALayer {
@private
NSSize _blockSize;
NSMutableArray* layers;
NSMutableArray* _images;
}
+ (NinePartLayer*) layerWithImage:(NSImage*)aImage;
@property (assign)NSSize blockSize;
- (void) setImage:(NSImage*)aImage;
@end
NinePartLayer.m
#import "NinePartLayer.h"
@interface NinePartLayer()
@property (retain)NSMutableArray* layers;
@property (retain)NSMutableArray* images;
@end
@implementation NinePartLayer
@synthesize images = _images;
@synthesize blockSize = _blockSize;
@synthesize layers;
+(NSImage*) imageFromImage:(NSImage *)anImage rect:(NSRect)aRect
{
@try {
NSPoint point = { -aRect.origin.x, -aRect.origin.y };
NSImage *theImage = [[self alloc] initWithSize:aRect.size];
[theImage lockFocus];
[anImage compositeToPoint:point operation:NSCompositeCopy];
[theImage unlockFocus];
[theImage autorelease];
return theImage;
}
@catch (NSException *exception) {
NSLog(@"%@",[exception description]);
return nil;
}
}
+ (NinePartLayer*) layerWithImage:(NSImage*)aImage
{
NinePartLayer* newLayer = [NinePartLayer layer];
[newLayer setImage:aImage];
return newLayer;
}
- (id)init {
self = [super init];
if (self) {
self.layers = [NSMutableArray array];
self.images = [NSMutableArray array];
}
return self;
}
- (void) updateLayers
{
for (int i = 0; i < 3 && i < [self.images count]; ++i) {
NSMutableArray* row = [self.images objectAtIndex:i];
for (int j = 0; j < 3 && j < [row count]; ++j) {
CALayer* item = [row objectAtIndex:j];
float x,y,width,height;
if(i == 0){
y = 0;
height = floorf(self.blockSize.height);
} else if(i == 1){
y = ceilf(self.blockSize.height);
height = self.frame.size.height - 2*self.blockSize.height;
} else if(i == 2){
y = self.frame.size.height - self.blockSize.height;
height = self.blockSize.height;
};
if(j == 0){
x = 0;
width = self.blockSize.width;
} else if(j == 1){
x = self.blockSize.width;
width = self.frame.size.width - 2*self.blockSize.width;
} else if(j == 2){
x = self.frame.size.width - self.blockSize.width;
width = self.blockSize.width;
};
item.frame = CGRectMake(x, y, width, height);
float delta=0;
if((i==1)&&(j==0))
{
item.frame = CGRectMake(x, y-delta, width+delta, height+2*delta);
}
if((i==2)&&(j==1))
{
item.frame = CGRectMake(x-delta, y-delta, width+2*delta, height+delta);
}
if((i==1)&&(j==2))
{
item.frame = CGRectMake(x-delta, y-delta, width+delta, height+2*delta);
}
if((i==0)&&(j==1))
{
item.frame = CGRectMake(x-delta, y, width+2*delta, height+delta);
}
}
}
}
- (void) setImage:(NSImage*)aImage
{
for(int i = 0; i < [self.layers count]; ++i)
[[self.layers objectAtIndex:i] removeFromSuperlayer];
[self.layers removeAllObjects];
self.images = [NSMutableArray array];
self.layers = [NSMutableArray array];
if(!aImage)
return;
for (int i = 0; i < 3; ++i) {
NSMutableArray* row = [NSMutableArray array];
for (int j = 0; j < 3; ++j) {
NSImage* img = [NSImage imageFromImage:aImage
rect:NSMakeRect((float)j/3.0*[aImage size].width,
(float)i/3.0*[aImage size].height,
1.0/3.0*[aImage size].width,
1.0/3.0*[aImage size].height)];
self.blockSize = NSMakeSize(1.0/3.0*[aImage size].width, 1.0/3.0*[aImage size].height);
CALayer* item = [CALayer layer];
[item performSelectorOnMainThread:@selector(setContents:) withObject:img waitUntilDone:NO];
[item performSelectorOnMainThread:@selector(setContentsGravity:) withObject:kCAGravityResize waitUntilDone:NO];
[self performSelectorOnMainThread:@selector(addSublayer:) withObject:item waitUntilDone:NO];
[row addObject:item];
[self.layers addObject:item];
}
[self.images addObject:row];
}
[self performSelectorOnMainThread:@selector(updateLayers) withObject:nil waitUntilDone:NO];
}
- (void) setFrame:(CGRect)frame
{
[super setFrame:frame];
[self updateLayers];
}
- (void) setBounds:(CGRect)bounds
{
[super setBounds:bounds];
[self updateLayers];
}
- (void) setPosition:(CGPoint)position
{
[super setPosition:position];
[self updateLayers];
}
- (void)dealloc {
self.layers = nil;
self.images = nil;
[super dealloc];
}
@end
用法：
NinePartLayer * pageContainerShadowlayer=[NinePartLayer layerWithImage:[NSImage imageNamed:@"drop_shadow.png"]];
pageContainerShadowlayer.frame=[mainView layer].bounds;
pageContainerShadowlayer.autoresizingMask=kCALayerWidthSizable | kCALayerHeightSizable;
[[rootView layer] insertSublayer:pageContainerShadowlayer atIndex:3];
答案 1 :(得分：1)
以防其他人在几年后偶然发现这个问题（就像我一样）——从 macOS 10.10 (Yosemite) 开始，NSImage 有一个 capInsets 属性，它使用单一来源处理九部分图像行为图像。耶！
答案 2 :(得分：0)
您考虑过NSDrawNinePartImage了吗？它是专门为您提出的布置中绘制九个图像（四个角，四个边和一个中心）而设计的功能，没有可见的接缝，也没有拉伸角和边缘图像。
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？