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(ORIGIN_X, ORIGIN_Y)
縲ヽ荳翫�髟キ縺� REAL_SIZE(m)
縺ッG荳翫〒 DISPLAY_SIZE(dot)
縺ァ陦ィ縺輔l繧九b縺ョ縺ィ縺吶k縲�
Figure 1: 迚ゥ逅�コァ讓咏ウサ縺ィ繝�ぅ繧ケ繝励Ξ繧、蠎ァ讓咏ウサ
-----------------------/* "ex4-1.c" --- */ #include <stdio.h> #include <Xtc.h> #define ORIGIN_X 320 #define ORIGIN_Y 200 #define REAL_SIZE 1.0 #define DISPLAY_SIZE 150 /* 蠎ァ讓吝、画鋤 */ #define gx(x) ((int)(ORIGIN_X+(x)*DISPLAY_SIZE/REAL_SIZE)) #define gy(y) ((int)(ORIGIN_Y-(y)*DISPLAY_SIZE/REAL_SIZE)) int main(void) { int x,y; initgraph(); /* 繧ー繝ゥ繝輔ぅ繝�け繧ケ迺ー蠅��蛻晄悄蛹� */ setcolor( WHITE ); /* 蠎ァ讓呵サク縺ョ陦ィ遉コ濶イ險ュ螳� */ line( gx(0.0), gy(0.0), gx(1.0), gy(0.0) ); /* x霆ク縺ョ謠冗判 */ line( gx(0.0), gy(0.0), gx(0.0), gy(1.0) ); /* y霆ク縺ョ謠冗判 */ outtextxy( gx(0.0) - 20, gy(0.0) + 20, "0" ); /* 蜴溽せ陦ィ遉コ */ setcolor( RED ); line( gx(0.0), gy(0.0), gx(0.2), gy(0.5) ); /* 邱壼�縺ョ謠冗判 */ xtcmainloop( 3 ); /* 邨ゆコ��蜉帛セ�■ */ closegraph(); /* 繧ー繝ゥ繝輔ぅ繝�け繧ケ迺ー蠅��邨ゆコ� */ }-----------------------