c:graphics.h:drawpoly
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| + | ===== drawpoly ===== | ||
| + | |||
| + | |||
| + | ====Syntax of drawpoly ==== | ||
| + | <code c> | ||
| + | #include <graphics.h> | ||
| + | void drawpoly(int numpoints, int *polypoints); | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Description of drawpoly ==== | ||
| + | <code c> | ||
| + | drawpoly draws a polygon with numpoints points, using the current line | ||
| + | style and color. | ||
| + | *polypoints points to a sequence of (numpoints * 2) integers. Each pair | ||
| + | of integers gives the x- and y-coordinates of a point on the polygon. | ||
| + | In order to draw a closed figure with n vertices, you must pass n + 1 | ||
| + | coordinates to drawpoly where the nth coordinate is equal to the 0th. | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Example of drawpoly ==== | ||
| + | <code c> | ||
| + | /* drawpoly example */ | ||
| + | |||
| + | #include <graphics.h> | ||
| + | #include <stdlib.h> | ||
| + | #include <stdio.h> | ||
| + | #include <conio.h> | ||
| + | |||
| + | int main(void) | ||
| + | { | ||
| + | /* request autodetection */ | ||
| + | int gdriver = DETECT, gmode, errorcode; | ||
| + | int maxx, maxy; | ||
| + | |||
| + | int poly[10]; /* our polygon array */ | ||
| + | |||
| + | /* initialize graphics and local variables */ | ||
| + | initgraph(&gdriver, &gmode, ""); | ||
| + | |||
| + | /* read result of initialization */ | ||
| + | errorcode = graphresult(); | ||
| + | if (errorcode != grOk){ /* an error occurred */ | ||
| + | printf("Graphics error: %s\n", grapherrormsg(errorcode)); | ||
| + | |||
| + | printf("Press any key to halt:"); | ||
| + | getch(); | ||
| + | exit(1); /* terminate with an error code */ | ||
| + | } | ||
| + | |||
| + | maxx = getmaxx(); | ||
| + | maxy = getmaxy(); | ||
| + | poly[0] = 20; /* first vertex */ | ||
| + | poly[1] = maxy / 2; | ||
| + | poly[2] = maxx - 20; /* second vertex */ | ||
| + | poly[3] = 20; | ||
| + | poly[4] = maxx - 50; /* third vertex */ | ||
| + | poly[5] = maxy - 20; | ||
| + | poly[6] = maxx / 2; /* fourth vertex */ | ||
| + | poly[7] = maxy / 2; | ||
| + | poly[8] = poly[0];/* drawpoly doesn't automatically close */ | ||
| + | |||
| + | poly[9] = poly[1];/* the polygon, so we close it */ | ||
| + | |||
| + | drawpoly(5, poly); /* draw the polygon */ | ||
| + | |||
| + | /* clean up */ | ||
| + | getch(); | ||
| + | closegraph(); | ||
| + | return 0; | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== See also ==== | ||
| + | [[fillpoly]] | ||
| + | [[floodfill]] | ||
| + | [[graphresult]] | ||
| + | [[setwritemode]] | ||
| + | |||
| + | |||
| + | ===== output of drawpoly example ===== | ||
| + | |||
| + | no output of example at the moment | ||
| + | do not hesitate and add it... | ||
| + | |||
| + | |||
on the occasion of the current invasion of Russia in Ukraine
c/graphics.h/drawpoly.txt · Last modified: 2024/02/16 01:05 (external edit)
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