bnch_rct.c

公司vc培训的时候,给大家几个例子,比较实用,拿来分享

/*........................... BENCH_RECT.C ................ 9-8-95 .........*/
#include <malloc.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <vsa.h>
#include <vsa_font.h>

extern unsigned _stklen = 10000;        /* This is for Borland C Only ! */

void main()
{
	clock_t clk,delta;
	unsigned x[1024],y[1024];
	unsigned i,num_rects;
	float timer;
	unsigned char huge *image;
	long sum,area;
	vsa_init(0x105);
LOOP:
	num_rects = 100;
	srand(1);
	for(i=0;i<num_rects;i++)
		{
			x[i] = ((unsigned long)(XResolution-1)*rand())/RAND_MAX;
			y[i] = ((unsigned long)(YResolution-1)*rand())/RAND_MAX;
		}
	vsa_set_color(6);
	vsa_move_to(0,0);
	clk = clock();
	for(i=0;i<num_rects;i++)
		{
			vsa_rect_fill(x[i],y[i]);
			vsa_move_to(x[i],y[i]);
			vsa_set_color(6*i);
		}
	delta = clock() - clk;
	timer = ((float)(delta))/((float)CLOCKS_PER_SEC);
	if(timer == 0) timer = .000001;
	printf("elapsed drawing time = %f sec\n",timer);

	sum = x[0]*y[0];
	for(i=1;i<num_rects;i++)
		{
			area = ((long)((int)x[i] - (int)x[i-1]))*
						 ((long)((int)y[i] - (int)y[i-1]));
			if(area < 0) area = -area;
			sum += area;
		}
	printf("RANDOM RECTANGLES: Drawing Rate = %f pixels/sec\n",sum/timer);
	vsa_set_color(255);
	vsa_move_to(320-1,240-1);
	vsa_rect(639+1,479+1);
	if(getch() == 27)
		goto BAIL;

	num_rects = 27;
	image = (unsigned char huge *) halloc(vsa_image_size(320,240,639,479),1);
	if(image == NULL)
		{
			printf("Not enough memory for allocation");
			goto BAIL;
		}
	vsa_get_image(320,240,639,479,image);
	vsa_set_color(0);
	clk = clock();
	for(i=0;i<num_rects;i++)
		{
			vsa_put_image(20*i,20*i,image,0);
			vsa_move_to(20*i,20*i);
			vsa_rect(20*i+320,20*i+240);
		}
	delta = clock() - clk;
	timer = ((float)(delta))/((float)CLOCKS_PER_SEC);
	if(timer == 0) timer = .000001;
	printf("elapsed drawing time = %f sec\n",timer);
	printf("BITBLT: Drawing Rate = %f pixels/sec\n",
					((unsigned long)num_rects*320L*240L)/timer);
	hfree(image);
	if(getch() == 27)
		goto BAIL;
	goto LOOP;
BAIL:
	vsa_init(0x3);
	return;
}