Drawing plots

Lab3/Lab3.cpp

@@ -0,0 +1,106 @@
+#include <conio.h>
+#include <graphics.h>
+#include <math.h>
+#include <stdio.h>
+const double PI = 3.141592653589793;
+const int scalex = 20;
+const int scaley = 34;
+
+double x1=PI/2;
+double x2=5*PI;
+
+double f(double x);
+
+int main()
+{
+    int graph_driver,graph_mode,graph_error_code;
+    char text[5];
+    double current_x=x1;
+    double current_y=f(x1);
+    double prev_x=current_x,prev_y=current_y;
+    double max_y=current_y;
+    double im_x=0;
+    graph_driver=DETECT;
+    initgraph(&graph_driver,&graph_mode,"C:\\TurboC3\\BGI");
+    graph_error_code=graphresult();
+    if(graph_error_code != grOk)
+    {
+        cputs(grapherrormsg(graph_error_code));
+        return 255;
+    }
+
+    double cur_x=getmaxx()/8;
+    double cur_y=getmaxy()/2;
+    setviewport(cur_x,cur_y,getmaxx(),getmaxy(),0);
+
+    line(0,-getmaxy(),0,180);
+    line(0,0,getmaxx(),0);
+    settextstyle(0,HORIZ_DIR,0);
+    settextjustify(LEFT_TEXT,TOP_TEXT);
+    outtextxy(-10,10,"0");
+    for(int i=1;i<=30;i+=1)
+    {
+        sprintf(text,"%d",i);
+        line(i*scalex,-2,i*scalex,2);
+        outtextxy(i*scalex,10,text);
+    }
+    for(int j=-2;j<3;j++)
+    {
+        
+        if(j==0)
+        {
+             sprintf(text," ");
+        }
+        else
+        {
+            sprintf(text,"%d",j);
+            line(-2,-2*j*scaley,2,-2*j*scaley);
+        }
+        outtextxy(-20,-2*j*scaley,text);
+    }
+    setlinestyle(1,1,1);
+    line(0,-2*current_y*scaley,current_x*scalex,-scaley*2*current_y);
+    line(current_x*scalex,0,current_x*scalex,-scaley*2*current_y);
+    putpixel(current_x*scalex,0,4);
+    putpixel(0,-current_y*scaley*2,4);
+    setlinestyle(0,1,1);
+    while(im_x<27)
+    {
+        if(im_x<x1||im_x>x2)
+        {
+            setcolor(WHITE);
+            line(scalex*im_x,-f(im_x)*scaley*2,scalex*(im_x+0.0001),-f(im_x+0.0001)*scaley*2);
+        }
+        else
+        {
+            setcolor(RED);
+            current_x+=0.0001;
+            current_y=f(current_x);
+            line(scalex*prev_x,-prev_y*scaley*2,scalex*current_x,-current_y*scaley*2);
+            prev_x=current_x;
+            prev_y=current_y;
+            if(current_y>max_y) max_y=current_y;
+        }
+        im_x+=0.0001;
+    }
+    setlinestyle(1,1,1);
+    line(0,-2*current_y*scaley,current_x*scalex,-scaley*2*current_y);
+    line(current_x*scalex,0,current_x*scalex,-scaley*2*current_y);
+    putpixel(0,-2*current_y*scaley,4);
+    putpixel(current_x*scalex,0,4);
+    setcolor(RED);
+    setlinestyle(0,1,3);
+    rectangle(75,75,170,100);
+    setcolor(WHITE);
+    setlinestyle(0,1,1);
+    sprintf(text,"%.2f",max_y);
+    settextjustify(LEFT_TEXT,TOP_TEXT);
+    outtextxy(85,80,"Max value: ");
+    outtextxy(85,90,text);
+    getch();
+    closegraph();
+    return 0;
+}
+double f(double x){
+    return pow(sin(x),2)+pow(cos(x),3);
+}