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
|
#include "Cloud.h"
#include "common.h"
#include "minorGems/util/random/StdRandomSource.h"
extern StdRandomSource randSource;
Cloud::Cloud()
: mBaseFade( 1.0 ), mShiftA( NULL ), mShiftB( NULL ) {
mXSpeed = randSource.getRandomBoundedDouble( 0.005, 0.001 );
}
void Cloud::shiftBetween( Cloud *inA, Cloud *inB, int inNumSteps ) {
mShiftA = inA;
mShiftB = inB;
mNumShiftSteps = inNumSteps;
mNumShiftStepsDone = 0;
}
void Cloud::draw( double inRotation, Vector3D *inPosition,
double inScale,
double inFadeFactor,
Color *inColor ) {
if( mShiftA == NULL ) {
GameObject::draw ( inRotation, inPosition,
inScale, inFadeFactor, inColor );
}
else {
double bBlend = mNumShiftStepsDone / (double)mNumShiftSteps;
double aBlend = 1 - bBlend;
// draw A underneath, but don't use full blend,
// because both A and be might be transparent
mShiftA->draw( inRotation, inPosition,
inScale, inFadeFactor * aBlend, inColor );
// fade B in on top
mShiftB->draw( inRotation, inPosition,
inScale, inFadeFactor * bBlend, inColor );
}
}
void Cloud::step() {
if( mShiftA == NULL ) {
mFadeFactor = mBaseFade;
// can see the stepping, pixel, pixel, pixel
//mX += mXSpeed;
}
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;
}
}
}
|
