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c:graphics.h:ellipse [2015/05/06 23:06] |
c:graphics.h:ellipse [2024/02/16 01:05] (current) |
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+ | ===== ellipse ===== | ||
+ | |||
+ | |||
+ | ====Syntax of ellipse ==== | ||
+ | <code c> | ||
+ | #include <graphics.h> | ||
+ | void ellipse(int x, int y, int stangle, int endangle, int xradius, int | ||
+ | yradius); | ||
+ | </code> | ||
+ | |||
+ | |||
+ | ==== Description of ellipse ==== | ||
+ | <code c> | ||
+ | ellipse draws an elliptical arc in the current drawing color with its | ||
+ | center at (x,y) and the horizontal and vertical axes given by xradius and | ||
+ | yradius, respectively. The ellipse travels from stangle to endangle. If | ||
+ | stangle equals 0 and endangle equals 360, the call to ellipse draws a | ||
+ | complete ellipse. | ||
+ | The angle for ellipse is reckoned counterclockwise, with 0 degrees at 3 | ||
+ | o'clock, 90 degrees at 12 o'clock, and so on. | ||
+ | The linestyle parameter does not affect arcs, circles, ellipses, or pie | ||
+ | slices. Only the thickness parameter is used. | ||
+ | </code> | ||
+ | |||
+ | |||
+ | ==== Example of ellipse ==== | ||
+ | <code c> | ||
+ | /* ellipse example */ | ||
+ | |||
+ | #include <graphics.h> | ||
+ | #include <stdlib.h> | ||
+ | #include <stdio.h> | ||
+ | #include <conio.h> | ||
+ | |||
+ | int main(void) | ||
+ | { | ||
+ | /* request autodetection */ | ||
+ | int gdriver = DETECT, gmode, errorcode; | ||
+ | int midx, midy; | ||
+ | int stangle = 0, endangle = 360; | ||
+ | int xradius = 100, yradius = 50; | ||
+ | |||
+ | /* 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 */ | ||
+ | } | ||
+ | |||
+ | midx = getmaxx() / 2; | ||
+ | midy = getmaxy() / 2; | ||
+ | setcolor(getmaxcolor()); | ||
+ | |||
+ | /* draw ellipse */ | ||
+ | ellipse(midx, midy, stangle, endangle, xradius, yradius); | ||
+ | |||
+ | /* clean up */ | ||
+ | getch(); | ||
+ | closegraph(); | ||
+ | return 0; | ||
+ | } | ||
+ | </code> | ||
+ | |||
+ | |||
+ | ==== See also ==== | ||
+ | [[arc]] | ||
+ | [[circle]] | ||
+ | [[fillellipse]] | ||
+ | [[sector]] | ||
+ | |||
+ | |||
+ | ===== output of ellipse example ===== | ||
+ | |||
+ | no output of example at the moment | ||
+ | do not hesitate and add it... | ||
+ | |||
+ | |||