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TLCalendarTimelineLayer.m
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TLCalendarTimelineLayer.m
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//
// TLCalendarTimelineLayer.m
// Mercatalog
//
// Created by Nathan Vander Wilt on 12/3/08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import "TLCalendarTimelineLayer.h"
#import "TLCocoaToolbag.h"
#import "TLGeometry.h"
#import "TLFloat.h"
enum {
kTLTimeCalendarUnitNone = 0,
kTLTimeCalendarUnitDecade = -10,
kTLTimeCalendarUnitCentury = -100,
kTLTimeCalendarUnitMillenium = -1000
};
typedef tl_int_t TLTimeCalendarUnit;
static TLTimeCalendarUnit TLTimeNextLargerUnit(TLTimeCalendarUnit extendedUnit);
//static TLTimeCalendarUnit TLTimeNextSmallerUnit(TLTimeCalendarUnit extendedUnit);
static CFTimeInterval TLTimeGetAverageLengthOfUnit(TLTimeCalendarUnit extendedUnit);
static Boolean TLTimeRangeOfUnit(CFCalendarRef calendar, TLTimeCalendarUnit extendedUnit,
CFAbsoluteTime targetTime,
CFAbsoluteTime* startTime, CFTimeInterval* duration);
@implementation TLCalendarTimelineLayer
- (NSString*)dateFormatForUnit:(TLTimeCalendarUnit)extendedUnit {
CFStringRef dateFormat = NULL;
switch (extendedUnit) {
case kCFCalendarUnitEra:
dateFormat = CFSTR("G");
break;
case kTLTimeCalendarUnitMillenium:
case kTLTimeCalendarUnitCentury:
case kTLTimeCalendarUnitDecade:
case kCFCalendarUnitYear:
dateFormat = CFSTR("yyyy");
break;
case kCFCalendarUnitMonth:
dateFormat = CFSTR("MMMM");
break;
case kCFCalendarUnitDay:
dateFormat = CFSTR("d");
break;
case kCFCalendarUnitWeekday:
dateFormat = CFSTR("EEEE");
break;
case kCFCalendarUnitHour:
dateFormat = CFSTR("ha");
break;
case kCFCalendarUnitMinute:
dateFormat = CFSTR("h:mm");
break;
case kCFCalendarUnitSecond:
dateFormat = CFSTR(":ss");
break;
}
return (NSString*)dateFormat;
}
- (CGFloat)tickWidthForUnit:(TLTimeCalendarUnit)extendedUnit {
CGFloat tickWidth = 0.0f;
switch (extendedUnit) {
case kCFCalendarUnitEra:
tickWidth = 1.0f;
break;
case kTLTimeCalendarUnitMillenium:
case kTLTimeCalendarUnitCentury:
case kTLTimeCalendarUnitDecade:
case kCFCalendarUnitYear:
tickWidth = 0.75f;
break;
case kCFCalendarUnitMonth:
tickWidth = 0.5f;
break;
case kCFCalendarUnitDay:
tickWidth = 0.25f;
break;
case kCFCalendarUnitWeekday:
tickWidth = 0.15f;
break;
case kCFCalendarUnitHour:
tickWidth = 0.1f;
break;
case kCFCalendarUnitMinute:
tickWidth = 0.075f;
break;
case kCFCalendarUnitSecond:
tickWidth = 0.025f;
break;
}
return tickWidth / 5.0f;
}
- (void)drawCalendarUnit:(TLTimeCalendarUnit)unit
inContext:(CGContextRef)ctx
withInfo:(id < TLTimelineInfo >)timelineInfo
{
CGRect visibleBounds = [timelineInfo visibleBounds];
CGPoint startPoint = CGPointMake(CGRectGetMinX(visibleBounds), 0.0f);
tl_time_t startTime = [timelineInfo timeForPoint:startPoint].time;
CGPoint endPoint = CGPointMake(CGRectGetMaxX(visibleBounds), 0.0f);
tl_time_t endTime = [timelineInfo timeForPoint:endPoint].time;
NSTimeInterval visibleDuration = endTime - startTime;
CGFloat mmWidth = [timelineInfo millimeterSize].width;
CFTimeInterval averageUnitLength = TLTimeGetAverageLengthOfUnit(unit);
CGFloat averageWidthPerUnit = CGRectGetWidth(visibleBounds) * (CGFloat)averageUnitLength / (CGFloat)visibleDuration;
if (averageWidthPerUnit < 5.0f * mmWidth) return;
NSTimeZone* timeZone = [timelineInfo timeZone];
NSTimeInterval offsetOfTimezone = -[timeZone secondsFromGMT];
NSCalendar* calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
[calendar setTimeZone:timeZone];
NSDateFormatter* dateFormatter = [[NSDateFormatter new] autorelease];
[dateFormatter setTimeZone:timeZone];
CGColorRef tickColor = CGColorCreateGenericGray(0.0f, 1.0f);
CGContextSetStrokeColorWithColor(ctx, tickColor);
CGColorRelease(tickColor);
TLTimeCalendarUnit biggerUnit = TLTimeNextLargerUnit(unit);
CFAbsoluteTime boundaryTime = startTime;
NSTimeInterval unitLength = 0.0;
while (boundaryTime < endTime) {
CFAbsoluteTime oldBoundaryTime = boundaryTime;
CFAbsoluteTime potentialBoundaryTime = oldBoundaryTime + unitLength;
Boolean foundBoundary = TLTimeRangeOfUnit((CFCalendarRef)calendar, unit,
potentialBoundaryTime, &boundaryTime, &unitLength);
if (!foundBoundary || boundaryTime == oldBoundaryTime || unitLength < 0) break;
CFAbsoluteTime biggerBoundaryTime = NAN;
Boolean foundBiggerBoundary = TLTimeRangeOfUnit((CFCalendarRef)calendar, biggerUnit,
boundaryTime, &biggerBoundaryTime, NULL);
if (foundBiggerBoundary && TLFloatEqual(biggerBoundaryTime, boundaryTime)) continue;
TLTimePair boundaryPair = TLTimePairMake(boundaryTime, offsetOfTimezone);
CGPoint boundaryPoint = [timelineInfo pointForTime:boundaryPair];
CGContextMoveToPoint(ctx, boundaryPoint.x, CGRectGetMinY(visibleBounds));
CGContextAddLineToPoint(ctx, boundaryPoint.x, CGRectGetMaxY(visibleBounds));
CGFloat tickWidth = [self tickWidthForUnit:unit];
CGContextSetLineWidth(ctx, tickWidth * mmWidth);
CGContextStrokePath(ctx);
CGFloat anchorSize = 0.75f;
CGRect anchorRect = TLCGRectMakeAroundPoint(boundaryPoint,
anchorSize * mmWidth,
anchorSize * [timelineInfo millimeterSize].height);
CGContextAddEllipseInRect(ctx, anchorRect);
CGContextStrokePath(ctx);
NSString* dateFormat = [self dateFormatForUnit:unit];
[dateFormatter setDateFormat:dateFormat];
NSString* labelString = [dateFormatter stringFromDate:TLTimeToDate(boundaryTime)];
CGFloat labelSize = 2.5f * mmWidth;
CGFloat padding = 0.5f * mmWidth;
CGPoint labelPosition = CGPointMake(boundaryPoint.x + padding, CGRectGetMinY(visibleBounds) + padding);
CGRect labelRect = CGRectNull;
TLTextDrawString(ctx, labelPosition, labelSize, labelString, &labelRect);
if (labelRect.size.width < averageWidthPerUnit) {
TLTextDrawString(ctx, labelPosition, labelSize, labelString, NULL);
}
}
}
- (void)drawInContext:(CGContextRef)ctx withInfo:(id < TLTimelineInfo >)timelineInfo {
TLTimeCalendarUnit unit = kCFCalendarUnitSecond;
do {
[self drawCalendarUnit:unit inContext:ctx withInfo:timelineInfo];
unit = TLTimeNextLargerUnit(unit);
} while (unit);
}
@end
TLTimeCalendarUnit TLTimeNextLargerUnit(TLTimeCalendarUnit extendedUnit) {
TLTimeCalendarUnit largerUnit = kTLTimeCalendarUnitNone;
switch (extendedUnit) {
case kTLTimeCalendarUnitMillenium:
largerUnit = kCFCalendarUnitEra;
break;
case kTLTimeCalendarUnitCentury:
largerUnit = kTLTimeCalendarUnitMillenium;
break;
case kTLTimeCalendarUnitDecade:
largerUnit = kTLTimeCalendarUnitCentury;
break;
case kCFCalendarUnitYear:
largerUnit = kTLTimeCalendarUnitDecade;
break;
case kCFCalendarUnitMonth:
largerUnit = kCFCalendarUnitYear;
break;
case kCFCalendarUnitDay:
largerUnit = kCFCalendarUnitMonth;
break;
case kCFCalendarUnitHour:
largerUnit = kCFCalendarUnitDay;
break;
case kCFCalendarUnitMinute:
largerUnit = kCFCalendarUnitHour;
break;
case kCFCalendarUnitSecond:
largerUnit = kCFCalendarUnitMinute;
break;
}
return largerUnit;
}
Boolean TLTimeRangeOfUnit(CFCalendarRef calendar, TLTimeCalendarUnit extendedUnit,
CFAbsoluteTime targetTime,
CFAbsoluteTime* startTime, CFTimeInterval* duration)
{
Boolean success = FALSE;
if (extendedUnit < 0) {
// find containing decade/century/millenium
int year = 0;
Boolean smallSuccess = CFCalendarDecomposeAbsoluteTime(calendar, targetTime, "y", &year);
if (smallSuccess) {
int roundAmount = -(int)extendedUnit;
int yearRoundedDown = floorf((float)year / roundAmount) * roundAmount;
CFAbsoluteTime start = NAN;
smallSuccess = CFCalendarComposeAbsoluteTime(calendar, &start, "y", yearRoundedDown);
if (smallSuccess) {
int yearRoundedUp = yearRoundedDown + roundAmount;
CFAbsoluteTime end = NAN;
smallSuccess = CFCalendarComposeAbsoluteTime(calendar, &end, "y", yearRoundedUp);
if (smallSuccess) {
if (startTime) *startTime = start;
if (duration) *duration = end - start;
success = TRUE;
}
}
}
}
else if (extendedUnit > 0) {
success = CFCalendarGetTimeRangeOfUnit(calendar, extendedUnit, targetTime, startTime, duration);
}
return success;
}
CFTimeInterval TLTimeGetAverageLengthOfUnit(TLTimeCalendarUnit extendedUnit) {
CFTimeInterval averageLength = 1.0;
switch (extendedUnit) {
case kCFCalendarUnitEra:
averageLength *= 5.0;
case kTLTimeCalendarUnitMillenium:
averageLength *= 10.0; // 10 millenium in a century...
case kTLTimeCalendarUnitCentury:
averageLength *= 10.0;
case kTLTimeCalendarUnitDecade:
averageLength *= 10.0;
case kCFCalendarUnitYear:
averageLength *= 12.0; // 12 months in a year...
case kCFCalendarUnitMonth:
averageLength *= (365.0 / 12.0);
case kCFCalendarUnitDay:
averageLength *= 24.0; // 24 hours in a day...
case kCFCalendarUnitHour:
averageLength *= 60.0;
case kCFCalendarUnitMinute:
averageLength *= 60.0;
case kCFCalendarUnitSecond: // ...starting with one second.
break;
default:
averageLength = 0.0; // (unknown unit)
}
return averageLength;
}