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//
// MATimeGraph.m
// MySQL Administrator
//
// Created by Alfredo Kojima on Thu Jul 22 2004.
// Copyright (c) 2004 MySQL AB. All rights reserved.
//
#import "MATimeGraph.h"
#include <glib.h>
@implementation MATimeGraph
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
_gridColor= [[NSColor colorWithDeviceRed:0.162 green:0.288 blue:0.358 alpha:0.8] retain];
_graphColor= [[NSColor colorWithDeviceRed:0.2 green:0.6 blue:1.0 alpha:1.0] retain];
_maxSamples= 1024;
_samples= g_new(MATimeGraphSample, _maxSamples);
_attr= [[NSDictionary alloc] init];
_caption= nil;
_rangeMin= 0;
_rangeMax= 100;
_gridWidth= 20;
_pixelsPerSecond= 1;
}
return self;
}
- (void)dealloc
{
g_free(_samples);
[_attr release];
[_caption release];
[_grid release];
[_graph release];
[_gridColor release];
[_graphColor release];
[super dealloc];
}
- (void)setRangeMin:(float)min max:(float)max
{
_rangeMin= min;
_rangeMax= max;
}
- (void)drawRect:(NSRect)rect
{
[[NSColor blackColor] set];
NSRectFill(rect);
[_gridColor set];
[_grid stroke];
[_graphColor set];
[_graph stroke];
if (_caption)
{
[_caption drawAtPoint:NSMakePoint(5,3)
withAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[NSColor whiteColor],NSForegroundColorAttributeName,
[NSFont systemFontOfSize:9.0], NSFontAttributeName,nil]];
}
}
- (void)addValue:(double)value
timestamp:(time_t)ts
{
MATimeGraphSample sample;
sample.value= value;
sample.ts= ts;
if (_sampleCount < _maxSamples)
_sampleCount++;
memmove(_samples+1, _samples, sizeof(*_samples)*(_sampleCount-1));
_samples[0]= sample;
[self updateGraph];
[self setNeedsDisplay:YES];
}
- (void)setCaption:(NSString*)caption
{
if (_caption != caption)
{
[_caption release];
_caption= [caption retain];
}
}
- (void)updateGraph
{
int parts;
int i;
time_t time0;
NSSize size= [self frame].size;
float x,y;
float gridHeight;
time_t prevTime;
if (_grid) [_grid release];
if (_graph) [_graph release];
_grid= [[NSBezierPath alloc] init];
[_grid setLineWidth:0.0];
_graph= [[NSBezierPath alloc] init];
[_graph setLineWidth:0.0];
gridHeight= (_rangeMax-_rangeMin)/5;
// horiz grid
parts= (_rangeMax - _rangeMin) / gridHeight;
for (i= 0; i < parts; i++)
{
[_grid moveToPoint:NSMakePoint(1,(size.height/parts)*i+0.5)];
[_grid lineToPoint:NSMakePoint(size.width-1,(size.height/parts)*i+0.5)];
}
if (_sampleCount==0)
time0= 0;
else
time0= _samples[0].ts;
// vert grid
if (_lastTime != time0)
{
if (_lastTime > 0)
{
_gridOffset+= (int)((time0-_lastTime)*_pixelsPerSecond);
}
_gridOffset%= (int)_gridWidth;
_lastTime= time0;
}
for (i= size.width-1-_gridOffset; i > 0; i-= _gridWidth)
{
[_grid moveToPoint:NSMakePoint(i+0.5, 1)];
[_grid lineToPoint:NSMakePoint(i+0.5, size.height-2)];
}
// graph
x= size.width-2;
prevTime= 0;
[_graph moveToPoint:NSMakePoint(x, 2)];
for (i= 0; i < _sampleCount; i++)
{
double xdelta;
xdelta= (prevTime ? (_samples[i].ts - prevTime) : 0.0);
x = x + xdelta * _pixelsPerSecond;
y= 1 + ((_samples[i].value - _rangeMin) * (size.height-2)) / (_rangeMax - _rangeMin);
if (y < 1)
y= 1;
if (x < 0)
break;
[_graph lineToPoint:NSMakePoint(x,y)];
prevTime= _samples[i].ts;
}
if (x > 0)
{
// start at 0
x -= 1;
y = 0.0;
[_graph lineToPoint:NSMakePoint(x,y)];
}
}
- (void)getStatsMin:(double*)min max:(double*)max average:(double*)avg
{
int i;
double mn, mx, av;
mn= 0;
mx= 0;
av= 0;
for (i= 0; i < _sampleCount; i++)
{
if (mn > _samples[i].value)
mn= _samples[i].value;
if (mx < _samples[i].value)
mx= _samples[i].value;
av+= _samples[i].value;
}
if (_sampleCount > 0)
av/= _sampleCount;
else
av= 0;
*min= mn;
*max= mx;
*avg= av;
}
@end
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