how do I get a blank image that I can draw lines and circles in and then save it to a jpeg file (and then open it later as a jpeg with ‘open’ )?
could be a command line Xcode/swift app I believe. Sounds easy but can’t find the swift way to do it (or any Xcode way)
Thanks for the help;the key was, I think, (as usual??). Reading the .h files instead of relying on manuals, which are great but never
have everything. Btw. ‘Mighty Quinn ‘. Is a fun song I had forgotten about ! Great name!
‘Here is the answer i was looking for ...not the colors I asked 4 but representative.
NSSize isize = {400.0 , 400.0};
NSRect nrect = {0.0,0.0,isize.width, isize.height};
NSImage *image = [[NSImage alloc] initWithSize: isize];
[image lockFocus];
float x_plot= 200, y_plot= 25;
float diameter1 = 20;
NSBezierPath * path3;
path3=[NSBezierPath bezierPathWithRect:nrect];
[NSColor.yellowColor set];
[path3 fill];
[NSColor.blueColor set];
NSBezierPath * path2; // = [[NSBezierPath alloc] init] ; //rect: nrect];
path2=[NSBezierPath bezierPathWithOvalInRect:nrect];
[[NSColor blueColor] set];
[path2 fill];
NSRect myRect1 = NSMakeRect(x_plot, y_plot, diameter1, diameter1);
NSBezierPath *path1;
path1 = [NSBezierPath bezierPathWithOvalInRect:myRect1];
[[NSColor blackColor] set];
[path1 fill];
[image unlockFocus];
NSData *imageData = [image TIFFRepresentation];
NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imageData];
NSNumber *compressionFactor = [NSNumber numberWithFloat:0.9];
NSDictionary *imageProps = [NSDictionary dictionaryWithObject:compressionFactor
forKey:NSImageCompressionFactor];
imageData = [imageRep representationUsingType:NSBitmapImageFileTypeJPEGproperties:imageProps];
[imageData writeToFile:@"/Users/aaaaa/abc4defg.jpg" atomically:YES];
You can subclass UIView,
in the draw func, use the UIBezierPath to draw what you want.
drawing is done with code like this:
let dotRect = CGRect(x: 100, y: 100, width: 6.0, height: 6.0) // Of course position precisely where you want
let dotPath = UIBezierPath(rect: dotRect)
dotColor.setFill()
dotPath.fill()After, convert the view to image with rendere, and save
https://stackoverflow.com/questions/30696307/how-to-convert-a-uiview-to-an-image
I can’t get Xcode 11.2.1 to recognize UIView as
a defined type
I can’t get Xcode 11.2.1 to recognize UIView as a defined type
Right. Claude31 assumed you were working on iOS but it seems that you’re working on macOS.
To get you started on the Mac, take a look at this code:
let bounds = NSRect(x: 0.0, y: 0.0, width: 100.0, height: 100.0)
let image = NSImage(size: bounds.size)
image.lockFocus()
NSColor.white.setFill()
bounds.fill()
let box = NSRect(x: 0.0, y: 0.0, width: 50.0, height: 50.0)
NSColor.red.setFill()
box.fill()
image.unlockFocus()
if let tiffData = image.tiffRepresentation(using: .lzw, factor: 0.0) {
print((tiffData as NSData).debugDescription)
}If you take the hex data it prints, use a hex editor to paste it into a file, and give that file a
.tiffNSImageFor more background on this, see the Cocoa Drawing Guide.
Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"Thanks for the help;the key was, I think, (as usual??). Reading the .h files instead of relying on manuals, which are great but never
have everything. Btw. ‘Mighty Quinn ‘. Is a fun song I had forgotten about ! Great name!
‘Here is the answer i was looking for ...not the colors I asked 4 but representative.
NSSize isize = {400.0 , 400.0};
NSRect nrect = {0.0,0.0,isize.width, isize.height};
NSImage *image = [[NSImage alloc] initWithSize: isize];
[image lockFocus];
float x_plot= 200, y_plot= 25;
float diameter1 = 20;
NSBezierPath * path3;
path3=[NSBezierPath bezierPathWithRect:nrect];
[NSColor.yellowColor set];
[path3 fill];
[NSColor.blueColor set];
NSBezierPath * path2; // = [[NSBezierPath alloc] init] ; //rect: nrect];
path2=[NSBezierPath bezierPathWithOvalInRect:nrect];
[[NSColor blueColor] set];
[path2 fill];
NSRect myRect1 = NSMakeRect(x_plot, y_plot, diameter1, diameter1);
NSBezierPath *path1;
path1 = [NSBezierPath bezierPathWithOvalInRect:myRect1];
[[NSColor blackColor] set];
[path1 fill];
[image unlockFocus];
NSData *imageData = [image TIFFRepresentation];
NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imageData];
NSNumber *compressionFactor = [NSNumber numberWithFloat:0.9];
NSDictionary *imageProps = [NSDictionary dictionaryWithObject:compressionFactor
forKey:NSImageCompressionFactor];
imageData = [imageRep representationUsingType:NSBitmapImageFileTypeJPEGproperties:imageProps];
[imageData writeToFile:@"/Users/aaaaa/abc4defg.jpg" atomically:YES];