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CPTFunctionDataSource.m
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#import "CPTFunctionDataSource.h"
#import "CPTMutablePlotRange.h"
#import "CPTNumericData.h"
#import "CPTScatterPlot.h"
#import "CPTUtilities.h"
#import "CPTXYPlotSpace.h"
#import "tgmath.h"
/// @cond
static void *CPTFunctionDataSourceKVOContext = (void *)&CPTFunctionDataSourceKVOContext;
@interface CPTFunctionDataSource()
@property (nonatomic, readwrite) CPTPlot *dataPlot;
@property (nonatomic, readwrite) double cachedStep;
@property (nonatomic, readwrite) NSUInteger dataCount;
@property (nonatomic, readwrite) NSUInteger cachedCount;
@property (nonatomic, readwrite, strong) CPTMutablePlotRange *cachedPlotRange;
-(instancetype)initForPlot:(CPTPlot *)plot NS_DESIGNATED_INITIALIZER;
-(void)plotBoundsChanged;
-(void)plotSpaceChanged;
@end
/// @endcond
#pragma mark -
/**
* @brief A datasource class that automatically creates scatter plot data from a function or Objective-C block.
**/
@implementation CPTFunctionDataSource
/** @property CPTDataSourceFunction dataSourceFunction
* @brief The function used to generate plot data.
**/
@synthesize dataSourceFunction;
/** @property CPTDataSourceBlock dataSourceBlock
* @brief The Objective-C block used to generate plot data.
**/
@synthesize dataSourceBlock;
/** @property CPTPlot *dataPlot
* @brief The plot that will display the function values. Must be an instance of CPTScatterPlot.
**/
@synthesize dataPlot;
/** @property CGFloat resolution
* @brief The maximum number of pixels between data points on the plot. Default is @num{1.0}.
**/
@synthesize resolution;
/** @property CPTPlotRange *dataRange
* @brief The maximum range of x-values that will be plotted. If @nil (the default), the function will be plotted for all visible x-values.
**/
@synthesize dataRange;
@synthesize cachedStep;
@synthesize cachedCount;
@synthesize dataCount;
@synthesize cachedPlotRange;
#pragma mark -
#pragma mark Init/Dealloc
/** @brief Creates and returns a new CPTFunctionDataSource instance initialized with the provided function and plot.
* @param plot The plot that will display the function values.
* @param function The function used to generate plot data.
* @return A new CPTFunctionDataSource instance initialized with the provided function and plot.
**/
+(instancetype)dataSourceForPlot:(CPTPlot *)plot withFunction:(CPTDataSourceFunction)function
{
return [[self alloc] initForPlot:plot withFunction:function];
}
/** @brief Creates and returns a new CPTFunctionDataSource instance initialized with the provided block and plot.
* @param plot The plot that will display the function values.
* @param block The Objective-C block used to generate plot data.
* @return A new CPTFunctionDataSource instance initialized with the provided block and plot.
**/
+(instancetype)dataSourceForPlot:(CPTPlot *)plot withBlock:(CPTDataSourceBlock)block
{
return [[self alloc] initForPlot:plot withBlock:block];
}
/** @brief Initializes a newly allocated CPTFunctionDataSource object with the provided function and plot.
* @param plot The plot that will display the function values.
* @param function The function used to generate plot data.
* @return The initialized CPTFunctionDataSource object.
**/
-(instancetype)initForPlot:(CPTPlot *)plot withFunction:(CPTDataSourceFunction)function
{
NSParameterAssert(function);
if ( (self = [self initForPlot:plot]) ) {
dataSourceFunction = function;
plot.dataSource = self;
}
return self;
}
/** @brief Initializes a newly allocated CPTFunctionDataSource object with the provided block and plot.
* @param plot The plot that will display the function values.
* @param block The Objective-C block used to generate plot data.
* @return The initialized CPTFunctionDataSource object.
**/
-(instancetype)initForPlot:(CPTPlot *)plot withBlock:(CPTDataSourceBlock)block
{
NSParameterAssert(block);
if ( (self = [self initForPlot:plot]) ) {
dataSourceBlock = block;
plot.dataSource = self;
}
return self;
}
/// @cond
-(instancetype)initForPlot:(CPTPlot *)plot
{
NSParameterAssert([plot isKindOfClass:[CPTScatterPlot class]]);
if ( (self = [super init]) ) {
dataPlot = plot;
dataSourceFunction = NULL;
dataSourceBlock = nil;
resolution = CPTFloat(1.0);
cachedStep = 0.0;
dataCount = 0;
cachedCount = 0;
cachedPlotRange = nil;
dataRange = nil;
plot.cachePrecision = CPTPlotCachePrecisionDouble;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(plotBoundsChanged)
name:CPTLayerBoundsDidChangeNotification
object:plot];
[plot addObserver:self
forKeyPath:@"plotSpace"
options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld | NSKeyValueObservingOptionInitial
context:CPTFunctionDataSourceKVOContext];
}
return self;
}
// function and plot are required; this will fail the assertions in -initForPlot:withFunction:
-(instancetype)init
{
return [self initForPlot:nil withFunction:NULL];
}
-(void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[dataPlot removeObserver:self forKeyPath:@"plotSpace" context:CPTFunctionDataSourceKVOContext];
}
/// @endcond
#pragma mark -
#pragma mark Accessors
/// @cond
-(void)setResolution:(CGFloat)newResolution
{
NSParameterAssert( newResolution > CPTFloat(0.0) );
if ( newResolution != resolution ) {
resolution = newResolution;
self.cachedCount = 0;
self.cachedPlotRange = nil;
[self plotBoundsChanged];
}
}
-(void)setDataRange:(CPTPlotRange *)newRange
{
if ( newRange != dataRange ) {
dataRange = newRange;
if ( ![dataRange containsRange:self.cachedPlotRange] ) {
self.cachedCount = 0;
self.cachedPlotRange = nil;
[self plotBoundsChanged];
}
}
}
/// @endcond
#pragma mark -
#pragma mark Notifications
/// @cond
/** @internal
* @brief Reloads the plot with more closely spaced data points when needed.
**/
-(void)plotBoundsChanged
{
CPTPlot *plot = self.dataPlot;
if ( plot ) {
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)plot.plotSpace;
if ( plotSpace ) {
CGFloat width = plot.bounds.size.width;
if ( width > CPTFloat(0.0) ) {
NSUInteger count = (NSUInteger)lrint( ceil(width / self.resolution) ) + 1;
if ( count > self.cachedCount ) {
self.dataCount = count;
self.cachedCount = count;
self.cachedStep = plotSpace.xRange.lengthDouble / count;
[plot reloadData];
}
}
else {
self.dataCount = 0;
self.cachedCount = 0;
self.cachedStep = 0.0;
}
}
}
}
/** @internal
* @brief Adds new data points as needed while scrolling.
**/
-(void)plotSpaceChanged
{
CPTPlot *plot = self.dataPlot;
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)plot.plotSpace;
CPTMutablePlotRange *plotRange = [plotSpace.xRange mutableCopy];
[plotRange intersectionPlotRange:self.dataRange];
CPTMutablePlotRange *cachedRange = self.cachedPlotRange;
double step = self.cachedStep;
if ( [cachedRange containsRange:plotRange] ) {
// no new data needed
}
else if ( ![cachedRange intersectsRange:plotRange] || (step == 0.0) ) {
self.cachedCount = 0;
self.cachedPlotRange = plotRange;
[self plotBoundsChanged];
}
else {
if ( step > 0.0 ) {
double minLimit = plotRange.minLimitDouble;
if ( ![cachedRange containsDouble:minLimit] ) {
NSUInteger numPoints = (NSUInteger)lrint( ( ceil( (cachedRange.minLimitDouble - minLimit) / step ) ) );
NSDecimal offset = CPTDecimalFromDouble(step * numPoints);
cachedRange.location = CPTDecimalSubtract(cachedRange.location, offset);
cachedRange.length = CPTDecimalAdd(cachedRange.length, offset);
self.dataCount += numPoints;
[plot insertDataAtIndex:0 numberOfRecords:numPoints];
}
double maxLimit = plotRange.maxLimitDouble;
if ( ![cachedRange containsDouble:maxLimit] ) {
NSUInteger numPoints = (NSUInteger)lrint( ceil( (maxLimit - cachedRange.maxLimitDouble) / step ) );
NSDecimal offset = CPTDecimalFromDouble(step * numPoints);
cachedRange.length = CPTDecimalAdd(cachedRange.length, offset);
self.dataCount += numPoints;
[plot insertDataAtIndex:plot.cachedDataCount numberOfRecords:numPoints];
}
}
else {
double maxLimit = plotRange.maxLimitDouble;
if ( ![cachedRange containsDouble:maxLimit] ) {
NSUInteger numPoints = (NSUInteger)lrint( ceil( (cachedRange.maxLimitDouble - maxLimit) / step ) );
NSDecimal offset = CPTDecimalFromDouble(step * numPoints);
cachedRange.location = CPTDecimalSubtract(cachedRange.location, offset);
cachedRange.length = CPTDecimalAdd(cachedRange.length, offset);
self.dataCount += numPoints;
[plot insertDataAtIndex:0 numberOfRecords:numPoints];
}
double minLimit = plotRange.minLimitDouble;
if ( ![cachedRange containsDouble:minLimit] ) {
NSUInteger numPoints = (NSUInteger)lrint( ceil( (minLimit - cachedRange.minLimitDouble) / step ) );
NSDecimal offset = CPTDecimalFromDouble(step * numPoints);
cachedRange.length = CPTDecimalAdd(cachedRange.length, offset);
self.dataCount += numPoints;
[plot insertDataAtIndex:plot.cachedDataCount numberOfRecords:numPoints];
}
}
}
}
/// @endcond
#pragma mark -
#pragma mark KVO Methods
/// @cond
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ( (context == CPTFunctionDataSourceKVOContext) && [keyPath isEqualToString:@"plotSpace"] && [object isEqual:self.dataPlot] ) {
CPTPlotSpace *oldSpace = change[NSKeyValueChangeOldKey];
CPTPlotSpace *newSpace = change[NSKeyValueChangeNewKey];
if ( oldSpace ) {
[[NSNotificationCenter defaultCenter] removeObserver:self
name:CPTPlotSpaceCoordinateMappingDidChangeNotification
object:oldSpace];
}
if ( newSpace ) {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(plotSpaceChanged)
name:CPTPlotSpaceCoordinateMappingDidChangeNotification
object:newSpace];
}
self.cachedPlotRange = nil;
[self plotSpaceChanged];
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
/// @endcond
#pragma mark -
#pragma mark CPTScatterPlotDataSource Methods
/// @cond
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
NSUInteger count = 0;
if ( [plot isEqual:self.dataPlot] ) {
count = self.dataCount;
}
return count;
}
-(CPTNumericData *)dataForPlot:(CPTPlot *)plot recordIndexRange:(NSRange)indexRange
{
CPTNumericData *numericData = nil;
NSUInteger count = self.dataCount;
if ( count > 0 ) {
CPTPlotRange *xRange = self.cachedPlotRange;
if ( !xRange ) {
[self plotSpaceChanged];
xRange = self.cachedPlotRange;
}
NSMutableData *data = [[NSMutableData alloc] initWithLength:indexRange.length * 2 * sizeof(double)];
double *xBytes = data.mutableBytes;
double *yBytes = data.mutableBytes + ( indexRange.length * sizeof(double) );
double location = xRange.locationDouble;
double length = xRange.lengthDouble;
double denom = (double)( count - ( (count > 1) ? 1 : 0 ) );
NSUInteger lastIndex = NSMaxRange(indexRange);
CPTDataSourceFunction function = self.dataSourceFunction;
if ( function ) {
for ( NSUInteger i = indexRange.location; i < lastIndex; i++ ) {
double x = location + ( (double)i / denom ) * length;
*xBytes++ = x;
*yBytes++ = function(x);
}
}
else {
CPTDataSourceBlock functionBlock = self.dataSourceBlock;
if ( functionBlock ) {
for ( NSUInteger i = indexRange.location; i < lastIndex; i++ ) {
double x = location + ( (double)i / denom ) * length;
*xBytes++ = x;
*yBytes++ = functionBlock(x);
}
}
}
numericData = [CPTNumericData numericDataWithData:data
dataType:CPTDataType( CPTFloatingPointDataType, sizeof(double), CFByteOrderGetCurrent() )
shape:@[@(indexRange.length), @2]
dataOrder:CPTDataOrderColumnsFirst];
}
return numericData;
}
/// @endcond
@end