Archive for 7 月, 2004
C语言的问题
昨天把下雨的题终于编完了。对Graphics.h里面的一些函数有了一个初步的了解。我觉得我设计的这个程序是一种多线程的程序的雏形，因为两个雨滴是相互独立的，互不影响。这是放在一个数组里面实现的。目前的问题是如果把间隔时间设置的相对短些的话，动画要光滑些，但是有闪烁的感觉。这也是所有编程语言的擦坪函数所带来的，怎么解决，确实是一个问题。
附上源程序:
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | #include <stdio.h> #include <math.h> #include <graphics.h> #include <stdlib.h> #include <time.h> #include <dos.h> #include <conio.h> #define PI 3.1415926 #define RAINDROPLEN 15 /* The length of a raindrop */ #define RAINTANGLE 0 /* The tangle of each raindrop */ #define RAINDROPZ 0 /* The internal of each raindrop */ #define RAINCOLOR white /* The color of each raindrop */ #define RAINWAVELEVEL 40 /* The level of each wave */ #define DELAYTIME 2000 /* The internal of each flash of the screen */ /* Calculate the next X,Y of a raindrop */ #define RAINDROPNEXTX(n,m) (int)((RAINDROPLEN/m+n)*sin(RAINTANGLE*(PI/180))) #define RAINDROPNEXTY(n,m) (int)((RAINDROPLEN/m+n)*cos(RAINTANGLE*(PI/180))) #define RAINDROPS 100 /* The total numbers of raindrops */ struct raindrop { int posx; int posy; int state; /* The current state of raindrop. 1 for raindrop. 2 for wave. */ int wavelevel; /* The current wave level */ }; void Init(struct raindrop *drops); void DrawDrops(struct raindrop *drops); /* Draw all the raindrops */ void CalDrops(struct raindrop *drops); /* Calculate the next raindrops position */ int main(void) { struct raindrop drops[RAINDROPS]; int gdriver=DETECT,gmode,i=0; initgraph(&gdriver,&gmode,""); /* Init graphic mode */ Init(drops); setbkcolor(0); while(!kbhit()) { cleardevice(); DrawDrops(drops); delay(DELAYTIME); CalDrops(drops); } return 0; } void Init(struct raindrop *drops) { int i; randomize(); for(i=0;i<RAINDROPS;i++,drops++) { drops->posx=random(600); drops->posy=random(300); drops->state=1; drops->wavelevel=0; } } void DrawDrops(struct raindrop *drops) { int i; int endx,endy; setcolor(WHITE); for(i=0;i<RAINDROPS;i++,drops++) { if (drops->state==1) { endx=RAINDROPNEXTX(0,1); endy=RAINDROPNEXTY(0,1); line(drops->posx,drops->posy,drops->posx+endx,drops->posy+endy); } else { ellipse(drops->posx,drops->posy,0,360,1+(drops->wavelevel)*0.75,0.05+(drops->wavelevel)*0.15); } } } void CalDrops(struct raindrop *drops) { int i; int endx,endy; int temp; for(i=0;i<RAINDROPS;i++,drops++) { if (drops->state==1) { endx=RAINDROPNEXTX(RAINDROPZ,10); endy=RAINDROPNEXTY(RAINDROPZ,10); if ((endx+drops->posx)>=640||(endy+drops->posy)>=400) { temp=random(100); if (temp%2==0||(endx+drops->posx)>=680||(endy+drops->posy)>=550) { drops->state=2; drops->wavelevel=1; } else { drops->posx=drops->posx+endx; drops->posy=drops->posy+endy; } } else { drops->posx=drops->posx+endx; drops->posy=drops->posy+endy; } } else { if ((drops->wavelevel)<RAINWAVELEVEL) { drops->wavelevel++; } else { drops->posx=random(600); drops->posy=random(100); drops->wavelevel=0; drops->state=1; } } } |
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