Model Redesign: Added Reference Frames

Added Inverse Functions
UI Redesign
Cleaned Code

MathPad/MPPowerFunctionLayout.m

@@ -0,0 +1,68 @@
+//
+//  MPPowerFunctionLayout.m
+//  MathPad
+//
+//  Created by Kim Wittenburg on 30.09.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import "MPPowerFunctionLayout.h"
+
+#define kMPEmptyBoxHeight (CTFontGetDescent((CTFontRef)self.font) + CTFontGetAscent((CTFontRef)self.font) + CTFontGetLeading((CTFontRef)self.font))
+#define kMPEmptyBoxYOrigin (-(CTFontGetDescent((CTFontRef)self.font) + CTFontGetLeading((CTFontRef)self.font)))
+
+#define kPowerFunctionExponentXOffset 1
+#define kPowerFunctionTrailingOffset 2
+
+@implementation MPPowerFunctionLayout
+
+- (NSRect)baseBounds
+{
+    if (NSEqualRects(_baseBounds, NSZeroRect)) {
+        return NSMakeRect(0, kMPEmptyBoxYOrigin, 0, kMPEmptyBoxHeight);
+    }
+    return _baseBounds;
+}
+
+- (MPPowerFunction *)powerFunction
+{
+    return (MPPowerFunction *)self.function;
+}
+
+- (NSIndexSet *)indexesOfRemainingChildren
+{
+    return [NSIndexSet indexSetWithIndex:0];
+}
+
+- (NSPoint)offsetOfChildLayoutAtIndex:(NSUInteger)index
+{
+    CGFloat y = self.baseBounds.size.height / 2;
+    return NSMakePoint(kPowerFunctionExponentXOffset, y);
+}
+
+- (BOOL)childAtIndexUsesSmallSize:(NSUInteger)index
+{
+    return YES;
+}
+
+- (NSIndexPath *)indexPathForLocalMousePoint:(NSPoint)point
+{
+    return [[NSIndexPath indexPathWithIndex:0] indexPathByAddingIndex:0];
+}
+
+- (NSRect)generateBounds
+{
+    NSRect exponentBounds = [self childLayoutAtIndex:0].bounds;
+    CGFloat y = self.baseBounds.origin.y;
+    CGFloat height = -y + [self offsetOfChildLayoutAtIndex:0].y + exponentBounds.size.height + exponentBounds.origin.y;
+    CGFloat width = kPowerFunctionExponentXOffset + exponentBounds.size.width + kPowerFunctionTrailingOffset;
+    return NSMakeRect(0, y, width, height);
+}
+
+- (void)draw
+{
+    MPLayout *exponentLayout = [self childLayoutAtIndex:0];
+    [exponentLayout drawAtPoint:[self offsetOfChildLayoutAtIndex:0]];
+}
+
+@end