開発環境
- OS X Mavericks - Apple(OS)
- Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
- C++ (プログラミング言語)
- g++(コンパイラ)
C++実践プログラミング (スティーブ オウアルライン (著)、Steve Oualline (原著)、Steve Oualline(原著)、望月 康司(翻訳)、クイープ(翻訳) 、オライリー・ジャパン)のⅡ部(シンプルなプログラミング)の11章(ビット演算)、11.8(ビットマップグラフィックス)、実習 11-2を解いてみる。
その他参考書籍
- C++プログラミング入門 (グレゴリー サティア (著)、ダウグ ブラウン (著)、Gregory Satir (原著)、Doug Brown (原著)、望月 康司 (翻訳)、谷口 功 (翻訳)、オライリージャパン)
実習 11-2
コード(BBEdit, Emacs)
sample.cpp
#include ≪iostream>
#include ≪assert.h>
const int X_SIZE = 40;
const int Y_SIZE = 60;
char graphics[X_SIZE / 8][Y_SIZE];
inline void set_bit(const int x, const int y)
{
assert((x >= 0) && (x ≪ X_SIZE));
assert((y >= 0) && (y ≪ Y_SIZE));
graphics[(x)/8][y] |= static_cast≪char>(0x80 >> ((x)%8));
}
inline void clear_bit(const int x, const int y)
{
assert((x >= 0) && (x ≪ X_SIZE));
assert((y >= 0) && (y ≪ Y_SIZE));
graphics[(x)/8][y] ^= static_cast≪char>(0x80 >> ((x)%8));
}
int main()
{
int loc_x, loc_y;
void print_graphics();
for (loc_x = 0; loc_x ≪ 10; ++loc_x) {
for (loc_y = 0; loc_y ≪ 10; ++loc_y) {
set_bit(loc_x, loc_y);
}
}
std::cout ≪≪ "10×10の正方形のビットマップ\n";
print_graphics();
return (0);
}
void print_graphics()
{
int x;
int y;
int bit;
for (y = 0; y ≪ Y_SIZE; ++y) {
for (x = 0; x ≪ X_SIZE / 8; ++x) {
for (bit = 0x80; bit > 0; bit = (bit >> 1)) {
assert((x >= 0) && (x ≪ (X_SIZE / 8)));
assert((y >= 0) && (y ≪ Y_SIZE));
if ((graphics[x][y] & bit) != 0) {
std::cout ≪≪ "X";
} else {
std::cout ≪≪ ".";
}
}
}
std::cout ≪≪ '\n';
}
}
Makefile
#
# FSFのg++コンパイラ用のMakefile
#
CC=g++
CFLAGS=-g -Wall
all: sample195_2
sample195_2: sample195_2.cpp
${CC} ${CFLAGS} -o sample195_2 sample195_2.cpp
clean:
rm sample195_2
入出力結果(Terminal)
$ make && ./sample195_2 g++ -g -Wall -o sample195_2 sample195_2.cpp 10×10の正方形のビットマップ XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ $
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