Optimize a views drawing code
- by xon1c
Hi,
in a simple drawing application I have a model which has a NSMutableArray curvedPaths holding all the lines the user has drawn. A line itself is also a NSMutableArray, containing the point objects. As I draw curved NSBezier paths, my point array has the following structure: linePoint, controlPoint, controlPoint, linePoint, controlPoint, controlPoint, etc... I thought having one array holding all the points plus control points would be more efficient than dealing with 2 or 3 different arrays.
Obviously my view draws the paths it gets from the model, which leads to the actual question: Is there a way to optimize the following code (inside the view's drawRect method) in terms of speed?
int lineCount = [[model curvedPaths] count];
// Go through paths
for (int i=0; i < lineCount; i++)
{
// Get the Color
NSColor *theColor = [model getColorOfPath:[[model curvedPaths] objectAtIndex:i]];
// Get the points
NSArray *thePoints = [model getPointsOfPath:[[model curvedPaths] objectAtIndex:i]];
// Create a new path for performance reasons
NSBezierPath *path = [[NSBezierPath alloc] init];
// Set the color
[theColor set];
// Move to first point without drawing
[path moveToPoint:[[thePoints objectAtIndex:0] myNSPoint]];
int pointCount = [thePoints count] - 3;
// Go through points
for (int j=0; j < pointCount; j+=3)
{
[path curveToPoint:[[thePoints objectAtIndex:j+3] myNSPoint]
controlPoint1:[[thePoints objectAtIndex:j+1] myNSPoint]
controlPoint2:[[thePoints objectAtIndex:j+2] myNSPoint]];
}
// Draw the path
[path stroke];
// Bye stuff
[path release];
[theColor release];
}
Thanks,
xonic
