107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
#include <conio.h>
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#include <graphics.h>
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#include <math.h>
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#include <stdio.h>
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const double PI = 3.141592653589793;
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const int scalex = 20;
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const int scaley = 34;
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double x1=PI/2;
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double x2=5*PI;
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double f(double x);
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int main()
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{
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int graph_driver,graph_mode,graph_error_code;
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char text[5];
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double current_x=x1;
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double current_y=f(x1);
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double prev_x=current_x,prev_y=current_y;
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double max_y=current_y;
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double im_x=0;
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graph_driver=DETECT;
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initgraph(&graph_driver,&graph_mode,"C:\\TurboC3\\BGI");
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graph_error_code=graphresult();
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if(graph_error_code != grOk)
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{
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cputs(grapherrormsg(graph_error_code));
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return 255;
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}
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double cur_x=getmaxx()/8;
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double cur_y=getmaxy()/2;
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setviewport(cur_x,cur_y,getmaxx(),getmaxy(),0);
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line(0,-getmaxy(),0,180);
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line(0,0,getmaxx(),0);
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settextstyle(0,HORIZ_DIR,0);
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settextjustify(LEFT_TEXT,TOP_TEXT);
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outtextxy(-10,10,"0");
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for(int i=1;i<=30;i+=1)
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{
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sprintf(text,"%d",i);
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line(i*scalex,-2,i*scalex,2);
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outtextxy(i*scalex,10,text);
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}
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for(int j=-2;j<3;j++)
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{
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if(j==0)
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{
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sprintf(text," ");
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}
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else
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{
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sprintf(text,"%d",j);
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line(-2,-2*j*scaley,2,-2*j*scaley);
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}
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outtextxy(-20,-2*j*scaley,text);
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}
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setlinestyle(1,1,1);
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line(0,-2*current_y*scaley,current_x*scalex,-scaley*2*current_y);
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line(current_x*scalex,0,current_x*scalex,-scaley*2*current_y);
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putpixel(current_x*scalex,0,4);
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putpixel(0,-current_y*scaley*2,4);
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setlinestyle(0,1,1);
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while(im_x<27)
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{
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if(im_x<x1||im_x>x2)
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{
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setcolor(WHITE);
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line(scalex*im_x,-f(im_x)*scaley*2,scalex*(im_x+0.0001),-f(im_x+0.0001)*scaley*2);
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}
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else
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{
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setcolor(RED);
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current_x+=0.0001;
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current_y=f(current_x);
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line(scalex*prev_x,-prev_y*scaley*2,scalex*current_x,-current_y*scaley*2);
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prev_x=current_x;
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prev_y=current_y;
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if(current_y>max_y) max_y=current_y;
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}
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im_x+=0.0001;
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}
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setlinestyle(1,1,1);
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line(0,-2*current_y*scaley,current_x*scalex,-scaley*2*current_y);
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line(current_x*scalex,0,current_x*scalex,-scaley*2*current_y);
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putpixel(0,-2*current_y*scaley,4);
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putpixel(current_x*scalex,0,4);
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setcolor(RED);
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setlinestyle(0,1,3);
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rectangle(75,75,170,100);
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setcolor(WHITE);
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setlinestyle(0,1,1);
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sprintf(text,"%.2f",max_y);
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settextjustify(LEFT_TEXT,TOP_TEXT);
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outtextxy(85,80,"Max value: ");
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outtextxy(85,90,text);
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getch();
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closegraph();
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return 0;
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}
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double f(double x){
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return pow(sin(x),2)+pow(cos(x),3);
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}
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