这是继续提出这个问题的代码.... Allow horizontal scrolling only in the core-plot barchart?
-(BOOL)pointingDeviceDraggedAtPoint:(CGPoint)interactionPoint
{
if ( !self.allowsUserInteraction || !self.graph.plotArea ) {
return NO;
}
CGPoint pointInPlotArea = [self.graph.plotArea convertPoint:interactionPoint toLayer:self.graph.plotArea];
if ( isDragging ) {
pointInPlotArea.y = lastDragPoint.y;//-- Madhup Changed it for allwoing scrolling only in horizontal direction --//
//-- Madhup Changed it for allwoing scrolling only in horizontal direction --//
//CGPoint displacement = CGPointMake(pointInPlotArea.x-lastDragPoint.x, pointInPlotArea.y-lastDragPoint.y);
CGPoint displacement = CGPointMake(pointInPlotArea.x-lastDragPoint.x, 0);
//--******************************--//
CGPoint pointToUse = pointInPlotArea;
// Allow delegate to override
if ( [self.delegate respondsToSelector:@selector(plotSpace:willDisplaceBy:)] ) {
displacement = [self.delegate plotSpace:self willDisplaceBy:displacement];
pointToUse = CGPointMake(lastDragPoint.x+displacement.x, lastDragPoint.y+displacement.y);
}
NSDecimal lastPoint[2], newPoint[2];
[self plotPoint:lastPoint forPlotAreaViewPoint:lastDragPoint];
[self plotPoint:newPoint forPlotAreaViewPoint:pointToUse];
CPPlotRange *newRangeX = [[self.xRange copy] autorelease];
CPPlotRange *newRangeY = [[self.yRange copy] autorelease];
NSDecimal shiftX = CPDecimalSubtract(lastPoint[0], newPoint[0]);
NSDecimal shiftY = CPDecimalSubtract(lastPoint[1], newPoint[1]);
newRangeX.location = CPDecimalAdd(newRangeX.location, shiftX);
newRangeY.location = CPDecimalAdd(newRangeY.location, shiftY);
// Delegate override
if ( [self.delegate respondsToSelector:@selector(plotSpace:willChangePlotRangeTo:forCoordinate:)] ) {
newRangeX = [self.delegate plotSpace:self willChangePlotRangeTo:newRangeX forCoordinate:CPCoordinateX];
newRangeY = [self.delegate plotSpace:self willChangePlotRangeTo:newRangeY forCoordinate:CPCoordinateY];
}
self.xRange = newRangeX;
self.yRange = newRangeY;
//-- Madhup Changed it for keeping y axis fixed --//
NSLog(@"%@",self.graph.axisSet.axes);
NSMutableArray *axisArr= [[NSMutableArray alloc] initWithArray:self.graph.axisSet.axes];
CPXYAxis *yAxis = [axisArr objectAtIndex:1];
CGPoint point = yAxis.position;
point.y -= lastDragPoint.x;
yAxis.position = point;
[axisArr replaceObjectAtIndex:1 withObject:yAxis];
self.graph.axisSet.axes = axisArr;
[axisArr release];
NSLog(@"%@",self.graph.axisSet.axes);
//--******************************--//
lastDragPoint = pointInPlotArea;
return YES;
}
return NO;
}
现在从代码中你可以看到我只能在水平方向停止滚动地图,但我仍然无法保持y轴固定。我已经在这个方法中为此编写了一些代码,但它似乎没有用。
答案 0 :(得分:4)
如果要在滚动时修改轴,请添加此行
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)_graph.axisSet;
axisSet.xAxis.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];
axisSet.yAxis.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];
答案 1 :(得分:0)
最初的问题现在有两个可行的解决方案,适用于最新的,截至此日期,存储库中的代码。
Allow horizontal scrolling only in the core-plot barchart?
仅将图表保留在象限中:
Allow horizontal scrolling only in the core-plot barchart?
仅允许在水平方向滚动:
Allow horizontal scrolling only in the core-plot barchart?
我已经将两种解决方案都用于散点图并且效果很好。