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
|
#include "Star.h"
#include "common.h"
#include "minorGems/util/random/StdRandomSource.h"
extern StdRandomSource randSource;
Star::Star()
: mShiftA( NULL ), mShiftB( NULL ) {
mBaseFade = 1.0;
mShimmerTime = randSource.getRandomBoundedInt( 0, 1000 );
mShimmerRate = randSource.getRandomBoundedDouble( 0.5, 1.0 );
}
void Star::shiftBetween( Star *inA, Star *inB, int inNumSteps ) {
mShiftA = inA;
mShiftB = inB;
mNumShiftSteps = inNumSteps;
mNumShiftStepsDone = 0;
}
void Star::step() {
mShimmerTime ++;
if( mShiftA == NULL ) {
mFadeFactor = 0.5 + 0.3 * sin( mShimmerRate * mShimmerTime / 25.0 );
mFadeFactor *= mBaseFade;
}
else {
// shifting
mNumShiftStepsDone ++;
if( mNumShiftStepsDone > mNumShiftSteps ) {
// stop shifting
mShiftA = NULL;
mShiftB = NULL;
}
else {
double bBlend = mNumShiftStepsDone / (double)mNumShiftSteps;
bBlend = smoothBlend( bBlend );
double aBlend = 1 - bBlend;
mX = mShiftA->mX * aBlend + mShiftB->mX * bBlend;
mY = mShiftA->mY * aBlend + mShiftB->mY * bBlend;
mFadeFactor = mShiftA->mFadeFactor * aBlend +
mShiftB->mFadeFactor * bBlend;
}
}
}
|
