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l3.c
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l3.c
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/**********************/
/* By. Dumitru Petrov */
/* Lab. 3 p.2 V21 */
/**********************/
#include <graphics.h>
#include <math.h>
#include <X11/Xlib.h>
/*
** Conversion of x coordinate - Window to Viewport
*/
double transformx(double coor, int *w)
{
if (!w)
return coor;
return (((coor - w[0]) / (w[2] - w[0])) * (w[6] - w[4])) + w[4];
}
/*
** Conversion of y coordinate - Window to Viewport
*/
double transformy(double coor, int *w)
{
if (!w)
return coor;
return (((coor - w[1]) / (w[3] - w[1])) * (w[7] - w[5])) + w[5];
}
/*
** draw "y = 5 * x - 3 * sin(pow(x, 2) * (k * x))" graphic
** if window parameter is null, then it is displayed on whole window
*/
void draw_first(int x_axis, int y_axis, double k, int window[])
{
double x = -x_axis, y, px, py, cx = getmaxx()/2, cy = getmaxy()/2;
int flag = 1;
while (x <= x_axis) {
/* Calculate y with given x */
y = 5 * x - 3 * sin(pow(x, 2) * (k * x));
/* Calculate coordoninates to display */
px = x * getmaxx() / 8 + cx;
/* -cy because of origin point in window(top left corner) */
py = y * -cy / y_axis + cy;
if (px <= getmaxx() && px > -1 && py > -1 && py <= getmaxy())
{
if (flag) {// CP to start
moveto(transformx(px, window), transformy(py, window));
flag = 0;
}
px = transformx(px, window);
py = transformy(py, window);
/* Draw segment line */
lineto(px, py);
/* update CP */
moveto(px, py);
} else {flag = 1;}
x += 0.01;
delay(5);
}
}
/*
** draw "y = cos(k * x)" graphic
** if window parameter is null, then it is displayed on whole window
*/
void draw_second(int x_axis, int y_axis, double k, int *window)
{
double x = -x_axis, y, px, py, cx = getmaxx()/2, cy = getmaxy()/2;
while (x < x_axis) {
/* Calculate y with given x */
y = cos(k * x);
/* Calculate coordoninates to display */
px = x * cx / x_axis + cx;
/* -cy because of origin point in window(top left corner) */
py = y * -cy / y_axis + cy;
if (px > getmaxx())
break;
if (x == -x_axis) // only for first loop
moveto(transformx(px, window), transformy(py, window));
/* Draw segment line */
px = transformx(px, window);
py = transformy(py, window);
lineto(px, py);
/* update CP */
moveto(px, py);
x += 0.01;
delay(2);
}
}
/*
** draw "y = 4 * pow(x, 7) - 3 * pow(x, 3) + 5" graphic
** if window parameter is null, then it is displayed on whole window
*/
void draw_last(int x_axis, int y_axis, float direction, int window[])
{
double x = 0, y, px, py, cx = getmaxx()/2, cy = getmaxy()/2;
while (x <= x_axis && x >= -x_axis) {
/* Calculate y with given x */
y = 4 * pow(x, 7) - 3 * pow(x, 3) + 5;
/* Calculate coordoninates to display */
px = x * cx / x_axis + cx;
/* -cy because of origin point in window(top left corner) */
py = y * -cy / y_axis + cy;
/* in case boundaries are passed */
if (py < 0 || py > getmaxy())
break;
if (x == 0) // only for first loop
moveto(transformx(px, window), transformy(py, window));
/* Draw segment line */
lineto(transformx(px, window), transformy(py, window));
/* update CP */
moveto(transformx(px, window), transformy(py, window));
x += direction;
delay(2);
}
}
void draw_axis(char *left, char *right, char *top, char *bottom, int w[])
{
int xmax = getmaxx(), ymax = getmaxy();
line(transformx(20, w), transformy(ymax/2, w), transformx(xmax-20, w), transformy(ymax/2, w));
line(transformx(xmax/2, w), transformy(20, w), transformx(xmax/2, w), transformy(ymax-20, w));
outtextxy(transformx(xmax/2, w), transformy(ymax/2, w), "O");
outtextxy(transformx(20, w), transformy(ymax/2, w), left);
outtextxy(transformx(xmax-40, w), transformy(ymax/2, w), right);
outtextxy(transformx(xmax/2, w), transformy(20, w), top);
outtextxy(transformx(xmax/2, w), transformy(ymax-40, w), bottom);
}
int main()
{
int gd = DETECT, gm;
XInitThreads();
initgraph(&gd, &gm, NULL);
/* draw axis */
int window1[] = {0, 0, getmaxx(), getmaxy(), 0, 0, getmaxx()/2, getmaxy()/2};
int window2[] = {0, 0, getmaxx(), getmaxy(), getmaxx()/2, 0, getmaxx(), getmaxy()/2};
int window3[] = {0, 0, getmaxx(), getmaxy(), 0, getmaxy()/2, getmaxx(), getmaxy()};
/* I displayed them in this order because of better looking */
rectangle(getmaxx()/2, 0, getmaxx(), getmaxy()/2);
draw_axis("-4", "4", "12", "-12", window2);
setcolor(GREEN);
setlinestyle(SOLID_LINE, 0, 2);
draw_first(5, 12, 1, window2);
setcolor(WHITE);
setlinestyle(SOLID_LINE, 0, 1);
rectangle(0, 0, getmaxx()/2, getmaxy()/2);
draw_axis("-2", "2", "7", "-7", window1);
setcolor(MAGENTA);
setlinestyle(SOLID_LINE, 0, 2);
/* from x=0 ++ */
draw_last(2, 7, 0.001, window1);
/* from x=0 -- */
draw_last(2, 7, -0.001, window1);
setcolor(WHITE);
setlinestyle(SOLID_LINE, 0, 1);
rectangle(0, 0, getmaxx()/2, getmaxy()/2);
draw_axis("-6", "6", "2", "-2", window3);
setcolor(RED);
setlinestyle(SOLID_LINE, 0, 2);
draw_second(6, 2, 1, window3);
getch();
closegraph();
return (0);
}