我是 Mac 应用程序开发的新手。我正在使用核心图框工作绘制条形图。实际上我想要的是，当我选择一个月时，我想绘制过去 6 个月的图表。当我选择“12/2012”时，我能够正确绘制过去 6 个月的图表。但是当我选择“02/2013”时，图表只显示一月和二月，而不是前几个月。
- (int)maxVal:(NSMutableArray *)arr {
NSDictionary *dict = [arr objectAtIndex:0];
NSString* dictValue = [dict objectForKey:@"X_VAL"];
int mxm = [dictValue intValue];
for (int i=0; i<[arr count]; i++) {
if ([[[arr objectAtIndex:i] objectForKey:@"X_VAL"] intValue] > mxm) {
mxm = [[[arr objectAtIndex:i] objectForKey:@"X_VAL"] intValue];
}
}
return mxm;
}
- (int)minVal:(NSMutableArray *)arr {
int mn = [[[arr objectAtIndex:0] objectForKey:@"X_VAL"] intValue];
for (int i=0; i<[arr count]; i++) {
if ([[[arr objectAtIndex:i] objectForKey:@"X_VAL"] intValue] < mn) {
mn = [[[arr objectAtIndex:i] objectForKey:@"X_VAL"] intValue];
}
}
return mn;
}
- (void)drawGraph {
if ([graphMutableArray count] > 0) {
NSRect viewRect = [aGraphView bounds];
double xAxisStart = 0, yAxisStart = 0, xAxisLength = [graphMutableArray count], yAxisLength = [[graphMutableArray valueForKeyPath:@"@max.Y_VAL"] doubleValue], tenthPartOfYAxis = (yAxisLength + (yAxisLength / 10));
NSLog(@"Y Axis Length = %f", yAxisLength);
for (int k = 0; k < xAxisLength; k++) {
NSDictionary *dict1 = [graphMutableArray objectAtIndex:k];
NSDictionary *dict2 = [dict1 objectForKey:@"X_VAL"];
NSDictionary *dict3 = [dict1 valueForKey:@"Y_VAL"];
NSLog(@"dict 2 = %@ and dict 3 = %@", dict2, dict3);
}
graph = [[CPTXYGraph alloc] initWithFrame:viewRect];
[graph applyTheme:[CPTTheme themeNamed:kCPTSlateTheme]];//kCPTDarkGradientTheme]];//kCPTStocksTheme]];
aGraphView.hostedGraph = graph;
graph.plotAreaFrame.masksToBorder = NO;
graph.paddingLeft = 90.0;
graph.paddingTop = 20.0;
graph.paddingRight = 20.0;
graph.paddingBottom = 70.0;
// Add plot space for horizontal bar charts
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(xAxisStart)
length:CPTDecimalFromDouble(xAxisLength + 1)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(yAxisStart)
length:CPTDecimalFromDouble(tenthPartOfYAxis)];
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
CPTXYAxis *x = axisSet.xAxis;
NSString *cptDecimalstr = [NSString stringWithFormat:@"%f", xAxisLength /[x.axisLabels count]];
x.majorIntervalLength = CPTDecimalFromString(cptDecimalstr);
x.minorTicksPerInterval = 1;
x.majorTickLineStyle = nil;
x.minorTickLineStyle = nil;
x.axisLineStyle = nil;
x.titleLocation = CPTDecimalFromFloat(1.0f);
x.titleOffset = 55.0f;
// Define some custom labels for the data elements
x.labelRotation = M_PI/4;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
NSLog(@"Max = %d and Min = %d", [self maxVal:graphMutableArray], [self minVal:graphMutableArray]);
NSMutableArray *tempCustomTickLocations = [NSMutableArray arrayWithObjects:[NSNumber numberWithFloat:0.5],[NSNumber numberWithFloat:1.7],[NSNumber numberWithFloat:3.0],[NSNumber numberWithFloat:4.1],[NSNumber numberWithFloat:5.3],[NSNumber numberWithFloat:6.5],[NSNumber numberWithFloat:6.9],[NSNumber numberWithFloat:7.1],[NSNumber numberWithFloat:7.5],[NSNumber numberWithFloat:8.1],[NSNumber numberWithFloat:8.5],[NSNumber numberWithFloat:8.9],nil];
NSMutableArray *tempMonthsArr = [NSMutableArray arrayWithObjects:@"",@"January", @"February", @"March", @"April", @"May", @"June", @"July", @"August", @"September", @"October", @"November", @"December", nil];
NSMutableArray *tempMonthsMutArr
= [[[NSMutableArray alloc] initWithCapacity:[graphMutableArray count]] autorelease], *tempMutCustomTickLocations
= [[[NSMutableArray alloc] initWithCapacity:[graphMutableArray count]] autorelease];
int k = 0;
for (int l = [self minVal:graphMutableArray]; l <=[self maxVal:graphMutableArray]; l++) {
NSString *tempMonth = [tempMonthsArr objectAtIndex:l];
[tempMonthsMutArr addObject:tempMonth];
[tempMutCustomTickLocations addObject:[tempCustomTickLocations objectAtIndex:k]];
k = k + 1;
NSLog(@"tempMutCustomTickLocations= %@",tempMutCustomTickLocations);
}
if ([self minVal:graphMutableArray] == [self maxVal:graphMutableArray]) {
NSString *tempMonth = [tempMonthsArr objectAtIndex:[self minVal:graphMutableArray]];
[tempMonthsMutArr addObject:tempMonth];
[tempMutCustomTickLocations addObject:[tempCustomTickLocations objectAtIndex:0]];
}
NSMutableArray *customTickLocations = [NSMutableArray arrayWithArray:tempMutCustomTickLocations];
NSArray *xAxisLabels = [NSArray arrayWithArray:tempMonthsMutArr];
NSUInteger labelLocation = 0;
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[graphMutableArray count]];
for (NSNumber *tickLocation in customTickLocations) {
//NSLog(@"tickLocation==%d",tickLocation.intValue);
CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:x.labelTextStyle];
newLabel.tickLocation = [tickLocation decimalValue];//[tickLocation decimalValue];
newLabel.offset = x.labelOffset + x.majorTickLength;
// NSLog(@"[tickLocation floatValue] = %f", [tickLocation floatValue]);
newLabel.offset = x.labelOffset + x.majorTickLength;
//NSLog(@"x.labelOffset = %f, x.majorTickLength = %f and newLabel.offset = %f", x.labelOffset, x.majorTickLength, newLabel.offset);
newLabel.rotation = M_PI/4;
//NSLog(@"-=-=-=--=-=-=- %f",x.labelOffset);
//NSLog(@"%f", x.majorTickLength );
[customLabels addObject:newLabel];
//NSLog(@"%@",customLabels);
[newLabel release];
}
x.axisLabels = [NSSet setWithArray:customLabels];
NSLog(@"%@",x.axisLabels);
CPTXYAxis *y = axisSet.yAxis;
y.axisLineStyle = nil;
y.majorTickLineStyle = nil;
y.minorTickLineStyle = nil;
NSString *cptDecimalStr = [NSString stringWithFormat:@"%f", yAxisLength / 10];
y.majorIntervalLength = CPTDecimalFromString(cptDecimalStr);
//y.constantCoordinateValue = CPTDecimalFromString(@"0");
// y.title = @"Y Axis";
y.titleOffset = 45.0f;
y.titleLocation = CPTDecimalFromFloat(150.0f);
//CPTPieChart
CPTBarPlot *plot = [[CPTBarPlot alloc] initWithFrame:CGRectZero];
plot.plotRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0)
length:CPTDecimalFromDouble(xAxisLength)];
plot.barOffset = [[NSDecimalNumber decimalNumberWithString:@"0.50"]
decimalValue]; //CPTDecimalFromDouble(0.50f);
plot.fill = [CPTFill fillWithColor:[CPTColor lightGrayColor]];
plot.dataSource = self;
[graph addPlot:plot ];//toPlotSpace:plotSpace];
}
else {
aGraphView.hostedGraph = nil;
[[NSAlert alertWithMessageText:@"No Data Found" defaultButton:@"Ok" alternateButton:nil otherButton:nil informativeTextWithFormat:@""] runModal];
}
}
谁能帮我解决问题！！！