Another Objective-C plugin, showing how to do various things in Core …

…Graphics.

objective-c/RandomCoreGraphicsGenerator/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>FSPluginMenuName</key>
+    <string>Convert to Grayscale RandomCG</string>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>com.yourcompany.RandomCG</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1.0</string>
+	<key>NSPrincipalClass</key>
+	<string>RandomCG</string>
+</dict>
+</plist>

objective-c/RandomCoreGraphicsGenerator/RandomCG.h

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+//
+//  RandomCG.h
+//  RandomCG
+//
+//  Created by August Mueller on 10/15/07.
+//  Copyright Flying Meat Inc 2007 . All rights reserved.
+//
+
+
+#import <Cocoa/Cocoa.h>
+#import <QuartzCore/QuartzCore.h>
+#import "ACPlugin.h"
+
+#import "RandomCG.h"
+
+@interface RandomCG : NSObject <ACPlugin> {
+
+}
+
+@end

objective-c/RandomCoreGraphicsGenerator/RandomCG.m

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+//
+//  RandomCG.m
+//  RandomCG
+//
+//  Created by August Mueller on 10/15/07.
+//  Copyright Flying Meat Inc 2007 . All rights reserved.
+//
+
+#import "RandomCG.h"
+
+#define PI 3.14159265358979323846
+
+@implementation RandomCG
+
++ (id)plugin {
+    return [[[self alloc] init] autorelease];
+}
+
+- (void) willRegister:(id<ACPluginManager>)pluginManager {
+
+    [pluginManager addFilterMenuTitle:@"Random CG Calls"
+                   withSuperMenuTitle:@"Generator"
+                               target:self
+                               action:@selector(make:userObject:)
+                        keyEquivalent:@""
+            keyEquivalentModifierMask:0
+                           userObject:nil];
+}
+
+- (void)didRegister {
+
+}
+
+- (CIImage*)make:(CIImage*)image userObject:(id)uo {
+
+    int w = [image extent].size.width;
+    int h = [image extent].size.height;
+
+    CGColorSpaceRef cs = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
+
+    CGContextRef context = CGBitmapContextCreate(nil, w, h, 8, 0, cs, kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
+
+    CGColorSpaceRelease(cs);
+
+    // Fill with a random color
+    CGContextSetRGBFillColor(context, (rand()%256)/255.0, (rand()%256)/255.0, (rand()%256)/255.0, 1);
+    CGContextBeginPath(context);
+    CGContextAddRect(context, CGRectMake(0, 0, w, h));
+    CGContextFillPath(context);
+
+    for (int i = 0; i < 20; i++) {
+        int numberOfSegments = rand() % 8;
+        int j;
+        float sx, sy;
+
+        CGContextBeginPath(context);
+        sx = rand()%w; sy = rand()%h;
+        CGContextMoveToPoint(context, rand()%w, rand()%h);
+        for (j = 0; j < numberOfSegments; j++) {
+            if (j % 2) {
+                CGContextAddLineToPoint(context, rand()%w, rand()%h);
+            }
+            else {
+                CGContextAddCurveToPoint(context, rand()%w, rand()%h,  
+                                         rand()%w, rand()%h,  rand()%h, rand()%h);
+            }
+        }
+        if(i % 2) {
+            CGContextAddCurveToPoint(context, rand()%w, rand()%h,
+                                     rand()%w, rand()%h,  sx, sy);
+            CGContextClosePath(context);
+            CGContextSetRGBFillColor(context, (float)(rand()%256)/255, 
+                                     (float)(rand()%256)/255, (float)(rand()%256)/255, 
+                                     (float)(rand()%256)/255);
+            CGContextFillPath(context);
+        }
+        else {
+            CGContextSetLineWidth(context, (rand()%10)+2);
+            CGContextSetRGBStrokeColor(context, (float)(rand()%256)/255, 
+                                       (float)(rand()%256)/255, (float)(rand()%256)/255, 
+                                       (float)(rand()%256)/255);
+            CGContextStrokePath(context);
+        }
+    }
+
+
+    CGImageRef imageRef = CGBitmapContextCreateImage(context);
+
+    CGContextRelease(context);
+
+    CIImage *returnImage = [CIImage imageWithCGImage:imageRef];
+
+    CGImageRelease(imageRef);
+
+    return returnImage;
+}
+
+- (NSNumber*)worksOnShapeLayers:(id)userObject {
+    return [NSNumber numberWithBool:NO];
+}
+
+- (NSNumber*)validateForLayer:(id<ACLayer>)layer {
+
+    if ([layer layerType] == ACBitmapLayer) {
+        [NSNumber numberWithBool:YES];
+    }
+
+    return [NSNumber numberWithBool:NO];
+}
+
+@end