iOS / PNChart

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kevinzhow
bf05af2e 1 parent e84f822c

Improve performence for linechart

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Showing 1 changed file with 8 additions and 5 deletions
... ... @@ -112,16 +112,17 @@
CGFloat firstValue = [[_yValues objectAtIndex:0] floatValue];
CGFloat xPosition = 0;
CGFloat chartCavanHeight = self.frame.size.height - 40.0;
CGFloat xLabelHeight = 20.0;
CGFloat chartCavanHeight = self.frame.size.height - xLabelHeight*2;
if(_showLabel){
chartCavanHeight = self.frame.size.height - chartMargin * 2 - 40.0;
chartCavanHeight = self.frame.size.height - chartMargin * 2 - xLabelHeight*2;
xPosition = _xLabelWidth;
}
float grade = (float)firstValue / (float)_yValueMax;
[progressline moveToPoint:CGPointMake( xPosition, chartCavanHeight - grade * chartCavanHeight + 20.0)];
[progressline moveToPoint:CGPointMake( xPosition, chartCavanHeight - grade * chartCavanHeight + xLabelHeight)];
[progressline setLineWidth:3.0];
[progressline setLineCapStyle:kCGLineCapRound];
[progressline setLineJoinStyle:kCGLineJoinRound];
... ... @@ -132,9 +133,11 @@
float grade = (float)value / (float)_yValueMax;
if (index != 0) {
[progressline addLineToPoint:CGPointMake(index * _xLabelWidth + 30.0+ _xLabelWidth /2.0, chartCavanHeight - grade * chartCavanHeight + 20.0)];
[progressline moveToPoint:CGPointMake(index * _xLabelWidth + 30.0 + _xLabelWidth /2.0, chartCavanHeight - grade * chartCavanHeight + 20.0 )];
CGPoint point = CGPointMake(index * _xLabelWidth + 30.0 + _xLabelWidth /2.0, chartCavanHeight - (grade * chartCavanHeight) + xLabelHeight);
[progressline addLineToPoint:point];
[progressline moveToPoint:point];
}
index += 1;
... ...