c:graphics.h:setwritemode
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c:graphics.h:setwritemode [2015/05/06 23:06] |
c:graphics.h:setwritemode [2024/02/16 01:05] (current) |
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| + | ===== setwritemode ===== | ||
| + | |||
| + | |||
| + | ====Syntax of setwritemode ==== | ||
| + | <code c> | ||
| + | #include <graphics.h> | ||
| + | void setwritemode(int mode); | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Description of setwritemode ==== | ||
| + | <code c> | ||
| + | The following constants are defined: | ||
| + | COPY_PUT = 0/* MOV */ | ||
| + | XOR_PUT = 1/* XOR */ | ||
| + | Each constant corresponds to a binary operation between each byte in the | ||
| + | line and the corresponding bytes onscreen. COPY_PUT uses the assembly | ||
| + | language MOV instruction, overwriting with the line whatever is on the | ||
| + | screen. XOR_PUT uses the XOR command to combine the line with the screen. | ||
| + | Two successive XOR commands will erase the line and restore the screen to | ||
| + | its original appearance. | ||
| + | setwritemode currently works only with line, linerel, lineto, rectangle, | ||
| + | and drawpoly. | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Example of setwritemode ==== | ||
| + | <code c> | ||
| + | /* setwritemode example */ | ||
| + | |||
| + | #include <graphics.h> | ||
| + | #include <stdlib.h> | ||
| + | #include <stdio.h> | ||
| + | #include <conio.h> | ||
| + | |||
| + | int main() | ||
| + | { | ||
| + | /* request autodetection */ | ||
| + | int gdriver = DETECT, gmode, errorcode; | ||
| + | int xmax, ymax; | ||
| + | |||
| + | /* 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 */ | ||
| + | } | ||
| + | |||
| + | xmax = getmaxx(); | ||
| + | ymax = getmaxy(); | ||
| + | |||
| + | /* select XOR drawing mode */ | ||
| + | setwritemode(XOR_PUT); | ||
| + | |||
| + | /* draw a line */ | ||
| + | line(0, 0, xmax, ymax); | ||
| + | getch(); | ||
| + | |||
| + | /* erase the line by drawing over it */ | ||
| + | line(0, 0, xmax, ymax); | ||
| + | getch(); | ||
| + | |||
| + | /* select overwrite drawing mode */ | ||
| + | setwritemode(COPY_PUT); | ||
| + | |||
| + | /* draw a line */ | ||
| + | |||
| + | line(0, 0, xmax, ymax); | ||
| + | |||
| + | /* clean up */ | ||
| + | getch(); | ||
| + | closegraph(); | ||
| + | return 0; | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== See also ==== | ||
| + | [[lineto]] | ||
| + | [[putimage]] | ||
| + | |||
| + | |||
| + | ===== output of setwritemode example ===== | ||
| + | |||
| + | no output of example at the moment | ||
| + | do not hesitate and add it... | ||
| + | |||
| + | |||
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