setbkcolor(YELLOW);
x0 = 263; y0 = 263; y1 = 275; x1 = 275;
for(i=0; i<=18; i )
{
setcolor(1);
rectangle(x0, y0, x1, y1);
x0 = x0 - 5;
y0 = y0 - 5;
x1 = x1 5;
y1 = y1 5;
}
settextstyle(DEFAULT_FONT, HORIZ_DIR, 2);
outtextxy(150, 40, "How beautiful it is!");
line(130, 60, 480, 60);
setcolor(2);
circle(269, 269, 137);
}
【程式59】
题目：画图，综合例子。
1.程式分析：
2.程式源代码：
#define PAI 3.1415926
#define B 0.809
#include "graphics.h"
#include "math.h"
/* 欢迎访问 C Builder研究 - www.ccrun.com */
main()
{
int i, j, k, x0, y0, x, y, driver, mode;
float a;
driver = CGA; mode = CGAC0;
initgraph(&driver, &mode, "");
setcolor(3);
setbkcolor(GREEN);
x0 = 150; y0 = 100;
circle(x0, y0, 10);
circle(x0, y0, 20);
circle(x0, y0, 50);
for(i=0; i<16; i )
{
a = (2 * PAI / 16) * i;
x = ceil(x0 48 * cos(a));
y = ceil(y0 48 * sin(a) * B);
setcolor(2);
line(x0, y0, x, y);
}
setcolor(3);
circle(x0, y0, 60);
/* Make 0 time normal size letters */
settextstyle(DEFAULT_FONT, HORIZ_DIR, 0);
outtextxy(10, 170, "press a key");
getch();
setfillstyle(HATCH_FILL, YELLOW);
floodfill(202, 100, WHITE);
getch();
for(k=0; k<=500; k )
{
setcolor(3);
for(i=0; i<=16; i )
{
a = (2 * PAI / 16) * i (2 * PAI / 180) * k;
x = ceil(x0 48 * cos(a));
y = ceil(y0 48 sin(a) * B);
setcolor(2);
line(x0, y0, x, y);
}
for(j=1; j<=50; j )
{
a = (2 * PAI / 16) * i (2 * PAI / 180) * k - 1;
x = ceil(x0 48 * cos(a));
y = ceil(y0 48 * sin(a) * B);
line(x0, y0, x, y);
}
}
restorecrtmode();
}
【程式60】
题目：画图，综合例子。
1.程式分析：
2.程式源代码：
#include "graphics.h"
#define LEFT 0
#define TOP 0
#define RIGHT 639
#define BOTTOM 479
#define LINES 400
#define MAXCOLOR 15
main()
{
int driver, mode, error;
int x1, y1;
int x2, y2;
int dx1, dy1, dx2, dy2, i = 1;
int count = 0;
int color = 0;
driver = VGA;
mode = VGAHI;
initgraph(&driver, &mode, "");
x1 = x2 = y1 = y2 = 10;
dx1 = dy1 = 2;
dx2 = dy2 = 3;
while(!kbhit())
{
line(x1, y1, x2, y2);
x1 = dx1; y1 = dy1;
x2 = dx2; y2 = dy2;
if(x1 <= LEFT || x1 >= RIGHT)
dx1 = -dx1;
if(y1 <= TOP || y1 >= BOTTOM)
dy1 = -dy1;
if(x2 <= LEFT || x2 >= RIGHT)
dx2 = -dx2;
if(y2 <= TOP || y2 >= BOTTOM)
dy2 = -dy2;
if( count > LINES)
{
setcolor(color);
color = (color >= MAXCOLOR)? 0: color;
}
}
closegraph();
}
