iOS / PNChart

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kevinzhow
bf05af2e 1 parent e84f822c

Improve performence for linechart

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Showing 1 changed file with 9 additions and 6 deletions
@@ -112,16 +112,17 @@ @@ -112,16 +112,17 @@
112 CGFloat firstValue = [[_yValues objectAtIndex:0] floatValue]; 112 CGFloat firstValue = [[_yValues objectAtIndex:0] floatValue];
113 113
114 CGFloat xPosition = 0; 114 CGFloat xPosition = 0;
115 - CGFloat chartCavanHeight = self.frame.size.height - 40.0; 115 + CGFloat xLabelHeight = 20.0;
  116 + CGFloat chartCavanHeight = self.frame.size.height - xLabelHeight*2;
116 if(_showLabel){ 117 if(_showLabel){
117 - chartCavanHeight = self.frame.size.height - chartMargin * 2 - 40.0; 118 + chartCavanHeight = self.frame.size.height - chartMargin * 2 - xLabelHeight*2;
118 - xPosition = _xLabelWidth; 119 + xPosition = _xLabelWidth;
119 } 120 }
120 121
121 float grade = (float)firstValue / (float)_yValueMax; 122 float grade = (float)firstValue / (float)_yValueMax;
122 123
123 124
124 - [progressline moveToPoint:CGPointMake( xPosition, chartCavanHeight - grade * chartCavanHeight + 20.0)]; 125 + [progressline moveToPoint:CGPointMake( xPosition, chartCavanHeight - grade * chartCavanHeight + xLabelHeight)];
125 [progressline setLineWidth:3.0]; 126 [progressline setLineWidth:3.0];
126 [progressline setLineCapStyle:kCGLineCapRound]; 127 [progressline setLineCapStyle:kCGLineCapRound];
127 [progressline setLineJoinStyle:kCGLineJoinRound]; 128 [progressline setLineJoinStyle:kCGLineJoinRound];
@@ -132,9 +133,11 @@ @@ -132,9 +133,11 @@
132 float grade = (float)value / (float)_yValueMax; 133 float grade = (float)value / (float)_yValueMax;
133 if (index != 0) { 134 if (index != 0) {
134 135
135 - [progressline addLineToPoint:CGPointMake(index * _xLabelWidth + 30.0+ _xLabelWidth /2.0, chartCavanHeight - grade * chartCavanHeight + 20.0)];  
136 - [progressline moveToPoint:CGPointMake(index * _xLabelWidth + 30.0 + _xLabelWidth /2.0, chartCavanHeight - grade * chartCavanHeight + 20.0 )];  
137 136
  137 + CGPoint point = CGPointMake(index * _xLabelWidth + 30.0 + _xLabelWidth /2.0, chartCavanHeight - (grade * chartCavanHeight) + xLabelHeight);
  138 +
  139 + [progressline addLineToPoint:point];
  140 + [progressline moveToPoint:point];
138 } 141 }
139 142
140 index += 1; 143 index += 1;