Question

I m 开发一个带有核心部署图的应用程序。在一些辅导员的帮助下,我设法用单一感触和rag。我怎么能以多面的触动和rag笑来做到这一点? 没有人要帮助我?

“enterography

www.un.org/Depts/DGACM/index_french.htm

- (void)viewDidLoad
{
    [super viewDidLoad];

    EskPlotTheme *defaultTheme = [[EskPlotTheme alloc] init];
    linePlot = [[EskLinePlot alloc] init];
    linePlot.delegate = self;
    [linePlot renderInLayer:lineHostingView withTheme:defaultTheme]; 
    [defaultTheme release];    
}

<>EskLinePlot.m

- (id)init
{
    self = [super init];
    if (self) 
    {
        // setting up the sample data here.
        sampleData = [[NSArray alloc] initWithObjects:[NSNumber numberWithInt:6000],
                                                      [NSNumber numberWithInt:3000],
                                                      [NSNumber numberWithInt:2000],
                                                      [NSNumber numberWithInt:5000],
                                                      [NSNumber numberWithInt:7000],
                                                      [NSNumber numberWithInt:8500],
                                                      [NSNumber numberWithInt:6500], nil];

    }
    return self;
}

- (void)renderInLayer:(CPTGraphHostingView *)layerHostingView withTheme:(CPTTheme *)theme
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    CGRect bounds = layerHostingView.bounds;

    // Create the graph and assign the hosting view.
    graph = [[CPTXYGraph alloc] initWithFrame:bounds];
    layerHostingView.hostedGraph = graph;
    [graph applyTheme:theme];

    graph.plotAreaFrame.masksToBorder = NO;

    // chang the chart layer orders so the axis line is on top of the bar in the chart.
    NSArray *chartLayers = [[NSArray alloc] initWithObjects:[NSNumber numberWithInt:CPTGraphLayerTypePlots],
                                                            [NSNumber numberWithInt:CPTGraphLayerTypeMajorGridLines], 
                                                            [NSNumber numberWithInt:CPTGraphLayerTypeMinorGridLines],  
                                                            [NSNumber numberWithInt:CPTGraphLayerTypeAxisLines], 
                                                            [NSNumber numberWithInt:CPTGraphLayerTypeAxisLabels], 
                                                            [NSNumber numberWithInt:CPTGraphLayerTypeAxisTitles], 
                                                            nil];
    graph.topDownLayerOrder = chartLayers;    
    [chartLayers release];

    // Add plot space for horizontal charts
    graph.paddingLeft = 60.0;
    graph.paddingTop = 70.0;
    graph.paddingRight = 20.0;
    graph.paddingBottom = 20.0;

    // Setup plot space
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
    plotSpace.allowsUserInteraction = YES;
    plotSpace.delegate = self;
    int sampleCount = [sampleData count]-1;
    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(sampleCount)];
    plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(10000)];

    // Setup grid line style
    CPTMutableLineStyle *majorXGridLineStyle = [CPTMutableLineStyle lineStyle];
    majorXGridLineStyle.lineWidth = 1.0f;
    majorXGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.25f];

    CPTMutableTextStyle *whiteTextStyle = [[[CPTMutableTextStyle alloc] init] autorelease];
    whiteTextStyle.color = [CPTColor whiteColor];    

    // Setup x-Axis.
    CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
    CPTXYAxis *x = axisSet.xAxis;
    x.majorGridLineStyle = majorXGridLineStyle;
    x.labelTextStyle = whiteTextStyle;
    x.majorIntervalLength = CPTDecimalFromString(@"1");
    x.minorTicksPerInterval = 1;

    NSArray *exclusionRanges = [NSArray arrayWithObjects:[CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(0) length:CPTDecimalFromInt(0)], nil];
    x.labelExclusionRanges = exclusionRanges;

    // Setup y-Axis.
    CPTMutableLineStyle *majorYGridLineStyle = [CPTMutableLineStyle lineStyle];
    majorYGridLineStyle.lineWidth = 1.0f;
    majorYGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.25];

    CPTMutableLineStyle *minorYGridLineStyle = [CPTMutableLineStyle lineStyle];
    minorYGridLineStyle.lineWidth = 1.0f;
    minorYGridLineStyle.lineColor = [[CPTColor blackColor] colorWithAlphaComponent:0.1];

    CPTXYAxis *y = axisSet.yAxis;
    y.majorGridLineStyle = majorYGridLineStyle;
    y.minorGridLineStyle = minorYGridLineStyle;
    y.labelTextStyle = whiteTextStyle;
    y.majorIntervalLength = CPTDecimalFromString(@"1000");
    y.minorTicksPerInterval = 1;
    y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0");
    NSArray *yExlusionRanges = [NSArray arrayWithObjects:
                                [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0) length:CPTDecimalFromFloat(0.0)],
                                nil];
    y.labelExclusionRanges = yExlusionRanges;

    // Create a high plot area
    CPTScatterPlot *highPlot = [[[CPTScatterPlot alloc] init] autorelease];
    highPlot.identifier = kHighPlot;

    CPTMutableLineStyle *highLineStyle = [[highPlot.dataLineStyle mutableCopy] autorelease];
    highLineStyle.lineWidth = 2.f;
    highLineStyle.miterLimit        = 1.0f;
    highLineStyle.lineColor = [CPTColor whiteColor];
    highPlot.dataLineStyle = highLineStyle;
    highPlot.dataSource = self;

    CPTColor *areaColor1       = [[CPTColor whiteColor] colorWithAlphaComponent:0.8f];
    CPTGradient *areaGradient1 = [CPTGradient gradientWithBeginningColor:areaColor1 endingColor:[[CPTColor whiteColor]  colorWithAlphaComponent:0.2f]];
    areaGradient1.angle = -90.0f;
    CPTFill *areaGradientFill = [CPTFill fillWithGradient:areaGradient1];
    highPlot.areaFill       = areaGradientFill;
    highPlot.areaBaseValue = [[NSDecimalNumber zero] decimalValue];
    [graph addPlot:highPlot];

    // Create the Savings Marker Plot
    selectedCoordination = 2;

    touchPlot = [[[CPTScatterPlot alloc] initWithFrame:CGRectNull] autorelease];
    touchPlot.identifier = kLinePlot;
    touchPlot.dataSource = self;
    touchPlot.delegate = self;
    [self hideTouchPlotColor];
    [graph addPlot:touchPlot];

    [pool drain];

}

- (void)hideTouchPlotColor
{
    CPTColor *touchPlotColor = [CPTColor clearColor];

    CPTMutableLineStyle *savingsPlotLineStyle = [CPTMutableLineStyle lineStyle];
    savingsPlotLineStyle.lineColor = touchPlotColor;

    CPTPlotSymbol *touchPlotSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    touchPlotSymbol.fill = [CPTFill fillWithColor:touchPlotColor];
    touchPlotSymbol.lineStyle = savingsPlotLineStyle;
    touchPlotSymbol.size = CGSizeMake(12.0f, 12.0f);

    CPTMutableLineStyle *touchLineStyle = [CPTMutableLineStyle lineStyle];
    touchLineStyle.lineColor = [CPTColor clearColor];
    touchLineStyle.lineWidth = 1.0f;

    CPTMutableLineStyle *symbolLineStyle = [CPTMutableLineStyle lineStyle];
    symbolLineStyle.lineColor = [CPTColor clearColor];
    CPTPlotSymbol *plotSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    plotSymbol.fill = [CPTFill fillWithColor:[CPTColor clearColor]];
    plotSymbol.lineStyle = symbolLineStyle;
    plotSymbol.size = CGSizeMake(10.0, 10.0);
    touchPlot.plotSymbol = plotSymbol;

    touchPlot.dataLineStyle = touchLineStyle;
}

// Assign different color to the touchable line symbol.
- (void)showTouchPlotColor
{
    CPTColor *touchPlotColor = [CPTColor orangeColor];

    CPTMutableLineStyle *savingsPlotLineStyle = [CPTMutableLineStyle lineStyle];
    savingsPlotLineStyle.lineColor = touchPlotColor;

    CPTPlotSymbol *touchPlotSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    touchPlotSymbol.fill = [CPTFill fillWithColor:touchPlotColor];
    touchPlotSymbol.lineStyle = savingsPlotLineStyle;
    touchPlotSymbol.size = CGSizeMake(12.0f, 12.0f); 

    CPTMutableLineStyle *touchLineStyle = [CPTMutableLineStyle lineStyle];
    touchLineStyle.lineColor = [CPTColor orangeColor];
    touchLineStyle.lineWidth = 1.0f;

    CPTMutableLineStyle *symbolLineStyle = [CPTMutableLineStyle lineStyle];
    symbolLineStyle.lineColor = [CPTColor blackColor];
    CPTPlotSymbol *plotSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    plotSymbol.fill = [CPTFill fillWithColor:[CPTColor orangeColor]];
    plotSymbol.lineStyle = symbolLineStyle;
    plotSymbol.size = CGSizeMake(10.0, 10.0);
    touchPlot.plotSymbol = plotSymbol;

    touchPlot.dataLineStyle = touchLineStyle;
}

// This method is call when user touch & drag on the plot space.
- (BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceDraggedEvent:(id)event atPoint:(CGPoint)point
{
    // Convert the touch point to plot area frame location
    CGPoint pointInPlotArea = [graph convertPoint:point toLayer:graph.plotAreaFrame];

    NSDecimal newPoint[2];
    [graph.defaultPlotSpace plotPoint:newPoint forPlotAreaViewPoint:pointInPlotArea];
    NSDecimalRound(&newPoint[0], &newPoint[0], 0, NSRoundPlain);
    int x = [[NSDecimalNumber decimalNumberWithDecimal:newPoint[0]] intValue];

    if (x < 0)
    {
        x = 0;
    }
    else if (x > [sampleData count])
    {
        x = [sampleData count];
    }

        selectedCoordination = x;
        if ([delegate respondsToSelector:@selector(linePlot:indexLocation:)])
            [delegate linePlot:self indexLocation:x];
        [touchPlot reloadData];

    return YES;
}

- (BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceDownEvent:(id)event 
          atPoint:(CGPoint)point
{
    [self showTouchPlotColor];
    return YES;
}

- (BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceUpEvent:(id)event atPoint:(CGPoint)point
{
    [self hideTouchPlotColor];
    touchPlotSelected = NO;
    return YES;
}

#pragma mark - 
#pragma mark Scatter plot delegate methods

- (void)scatterPlot:(CPTScatterPlot *)plot plotSymbolWasSelectedAtRecordIndex:(NSUInteger)index
{
    if ([(NSString *)plot.identifier isEqualToString:kLinePlot]) 
    {
        touchPlotSelected = YES;
        [self applyHighLightPlotColor:plot];
        if ([delegate respondsToSelector:@selector(linePlot:indexLocation:)])
            [delegate linePlot:self indexLocation:index];
    } 
}

#pragma mark -
#pragma mark Plot Data Source Methods

- (NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot 
{
    if ([(NSString *)plot.identifier isEqualToString:kLinePlot]) 
    {
        return kNumberOfMarkerPlotSymbols;
    }
    else {
        return [sampleData count];
    }
}

- (NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index 
{
    NSNumber *num = nil;
    if ( [(NSString *)plot.identifier isEqualToString:kHighPlot] )
    {
        if ( fieldEnum == CPTScatterPlotFieldY ) 
        {
            num = [sampleData objectAtIndex:index];
        } 
        else if (fieldEnum == CPTScatterPlotFieldX) 
        {
            num = [NSNumber numberWithInt:index];
        }
    }
    else if ([(NSString *)plot.identifier isEqualToString:kLinePlot]) 
    {
        if ( fieldEnum == CPTScatterPlotFieldY ) 
        {
            switch (index) {
                case 0:
                    num = [NSNumber numberWithInt:-1000];
                    break;
                case 2:
                    num = [NSNumber numberWithInt:12700];
                    break;
                default:
                    num = [sampleData objectAtIndex:selectedCoordination];
                    break;
            }
        } 
        else if (fieldEnum == CPTScatterPlotFieldX) 
        {
            num = [NSNumber numberWithInt:selectedCoordination];
        }
    }

    return num;
}

Answer 1

我最近遇到了同样的问题,找不到任何解决办法。在经过一段时间的研究和编码之后,我找到了一些解决办法,希望分享一个非常容易的办法,这样可以帮助大家了解如何解决这一问题。

I have created transparent UIView, which I ve put on top of CPTGraphHostingView. This view was handling needed touch events. Let s name it TestView

TestView.h file looks like

@protocol TestViewDelegate <NSObject>
- (void)myTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)myTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)myTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;

@end

@interface TestView : UIView
@property (nonatomic, weak) id <TestViewDelegate>delegate;
@end

申诉

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [self.delegate myTouchesBegan:touches withEvent:event];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    [self.delegate myTouchesMoved:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    [self.delegate myTouchesEnded:touches withEvent:event];
}

本人认为,包括核心在内的主计长位置托管观点将实施这些方法,并见以下守则样本:

- (void)myTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    if (touches.count == 1) {
        UITouch *touch = (UITouch *)[[touches allObjects] objectAtIndex:0];
        CGPoint point = [touch locationInView:nil];
        [self plotSpace:self.plotSpace shouldHandlePointingDeviceDraggedEvent:event atPoint:point];
    }
    if (touches.count == 2) {
        UITouch *touch = (UITouch *)[[touches allObjects] objectAtIndex:1];
        CGPoint point = [touch locationInView:nil];
        [self plotSpace:self.plotSpace shouldHandlePointingDeviceDraggedEvent:event atPoint:point];
    }
}

CPTPlot 空间代表方法,考虑到主计长将视而不见

- (BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceDraggedEvent:(id)event atPoint:(CGPoint)point{
    NSSet *allTouches = [event allTouches];
    if ([allTouches count] >0 ) {
        UITouch *touch1 = [[allTouches allObjects] objectAtIndex:0];
        if (touch1){
            CGPoint pointInPlotArea = [self.graph convertPoint:[touch1 locationInView:self.view] toLayer:self.graph.plotAreaFrame];
//              padding
            pointInPlotArea.x -=10;
            NSDecimal newPoint[2];
            [self.graph.defaultPlotSpace plotPoint:newPoint forPlotAreaViewPoint:pointInPlotArea];
            NSDecimalRound(&newPoint[0], &newPoint[0], 0, NSRoundPlain);
            int x = [[NSDecimalNumber decimalNumberWithDecimal:newPoint[0]] intValue];
            x--;

            if (x <= 0)
                x = 0;
            else if (x >= [self.currentDatapoints count])
                x = [self.currentDatapoints count] - 1;

            selectedCoordination = x;
            self.label.text = [NSString stringWithFormat:@"%@", [self.currentDatapoints objectAtIndex:x]];
            self.differenceLabel.text = @"";
            [touchPlot reloadData];
        }
        if ([allTouches count] > 1){
            secondTouchPlot.hidden = NO;
            UITouch *touch2 = [[allTouches allObjects] objectAtIndex:1];
            if (touch2) {
                CGPoint pointInPlotArea = [self.graph convertPoint:[touch2 locationInView:self.view] toLayer:self.graph.plotAreaFrame];
                pointInPlotArea.x -= 10;
                NSDecimal newPoint[2];
                [self.graph.defaultPlotSpace plotPoint:newPoint forPlotAreaViewPoint:pointInPlotArea];
                NSDecimalRound(&newPoint[0], &newPoint[0], 0, NSRoundPlain);
                int x = [[NSDecimalNumber decimalNumberWithDecimal:newPoint[0]] intValue];
                x--;
                if (x <= 0)
                    x = 0;
                else if (x >= [self.currentDatapoints count])
                    x = [self.currentDatapoints count] - 1;

                selectedCoordination2 = x;
                self.secondLabel.text = [NSString stringWithFormat:@"%@", [self.currentDatapoints objectAtIndex:x]];
                [secondTouchPlot reloadData];
                float first = [self.label.text floatValue];
                float second = [[self.currentDatapoints objectAtIndex:x] floatValue];
                self.differenceLabel.textColor = (first - second) > 0 ? [UIColor greenColor] : [UIColor redColor];
                self.differenceLabel.text = [NSString stringWithFormat:@"%f", first - second];

            }
        }
    }
    return YES;
}

因此......

“entergraph

这并不是最佳的法典,而是我前面提到的如何处理这一问题的想法。

希望有助于......

Answer 2

我最有可能最终在多个答复中回答这个问题,但我现在首先谈谈:

You would think Apple would have provided APIs to aid with multiple finger tracking algorithms, etc... within their Gesture Recognition objects, but they have not thus far. In the game that I developed, I needed to also have multiple fingers, up to 4 and beyond, all on screen and moving / tracking all at once. What I found was I had to implement my own finger tracking / down / up algorithms to accomplish things other than simple single finger swipes, and pinch-to-zoom operations. Lets dig in:

I beleive in your EskLinePlot.m file "should handle down events", you are going to need to implement an incrementer of "how many fingers are down". This way if you get another finger down when another is already down you will have a count of it. Similarly you are going to need to implement a decrementer in the "should handle up events" routine. In the middle of all this, will also need to be an (albeit) small database (probably an NSMutableArray) of touches. This database will be used to correlate the drag events to a finger. So how ultimately with this work. On a down event, you will: 1) create a new record in the touch database (the array number can act as your unique identifier 2) Record the new touch s current position into the (new) touch record you created in step 1 as the newest (or array position 0) position. Each touch item in the touch database should have a history of somewhere between 4 and 10 of the last positions the finger has been at (I tend to record positions as 0 = newest to 3 or 9 as the oldest). 3) Instead of simply turning on the SINGLE (graphical) line you have created, add a new (graphical) line when the down event has occured (doing the same correlation you are currently doing for screen finger position to graph numeric position)

For the "should process drag events": 1) Look at the sceen position of the finger being relayed in the drag event and correlate it to a touch within your internally held touch database (which touch in your touch database is closest to the one being presented at this time). 2) shift all previous position points for the correlated touch down by 1. 0 goes to 1, 1 goes to 2, etc... through all and of course drop the last one. 3) add the new point to the correalated touch s list of previous points as the newest point. 4) Move the (graphical) line that was correlated to that finger appropriately

For an up event: 1) correlate the position presented to a finger within your touch database. 2) remove the correlated touch from your touch database. 3) remove the (graphical) line that you had assigned to that finger from the screen

我希望这一帮助,我应该能够在某个地方找到一些样本,但我目前并不是在我的发展机器面前。

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