1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
Waveview.m:
Copyright (C) 2015 Steven Yi, Ed Costello, Aurelius Prochazka
This file is part of Csound iOS Examples.
The Csound for iOS Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA
*/
#import "Waveview.h"
#import "CsoundObj.h"
@implementation Waveview
{
BOOL tableLoaded;
CGFloat lastY;
CsoundObj *csObj;
MYFLT *table;
int tableLength;
MYFLT *displayData;
int fTableNumber;
}
- (void)displayFTable:(int)fTableNum
{
fTableNumber = fTableNum;
tableLoaded = NO;
[self updateValuesFromCsound];
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(context, 0, 0, 0, 1);
CGContextFillRect(context, rect);
if (tableLoaded) {
int width = self.frame.size.width;
CGContextSetRGBStrokeColor(context, 255, 255, 255, 1);
CGContextSetRGBFillColor(context, 255, 255, 255, 1);
CGMutablePathRef fill_path = CGPathCreateMutable();
CGFloat x = 0;
CGFloat y = displayData[0];
CGPathMoveToPoint(fill_path, &CGAffineTransformIdentity, x, y);
for(int i = 1; i < width; i++) {
CGPathAddLineToPoint(fill_path, &CGAffineTransformIdentity, i, displayData[i]);
}
CGContextAddPath(context, fill_path);
CGContextSetAllowsAntialiasing(context, YES);
CGContextDrawPath(context, kCGPathStroke);
CGPathRelease(fill_path);
}
}
- (void)setup:(CsoundObj *)csoundObj
{
tableLoaded = NO;
csObj = csoundObj;
fTableNumber = 1;
}
- (void)updataDisplayData
{
float scalingFactor = 0.9;
int width = self.frame.size.width;
int height = self.frame.size.height;
int middle = (height / 2);
displayData = malloc(sizeof(MYFLT) * width);
for(int i = 0; i < width; i++) {
float percent = i / (float)(width);
int index = (int)(percent * tableLength);
displayData[i] = (-(table[index] * middle * scalingFactor) + middle);
}
[self performSelectorOnMainThread:@selector(setNeedsDisplay)
withObject:nil
waitUntilDone:NO];
}
- (void)updateValuesFromCsound
{
if (!tableLoaded) {
CSOUND *cs = [csObj getCsound];
if ((tableLength = csoundTableLength(cs, fTableNumber)) > 0) {
table = malloc(tableLength * sizeof(MYFLT));
csoundGetTable(cs, &table, fTableNumber);
tableLoaded = YES;
[self performSelectorInBackground:@selector(updataDisplayData) withObject:nil];
}
}
}
@end
|
