{"id":3842,"date":"2018-03-03T14:02:09","date_gmt":"2018-03-03T06:02:09","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3842"},"modified":"2018-10-14T21:22:24","modified_gmt":"2018-10-14T13:22:24","slug":"opengl_flag","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_flag\/","title":{"rendered":"OpenGL\u4e4b\u65d7\u5e5f\u98c4\u63da"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u65d7\u5e5f\u98c4\u63da<\/figcaption><\/figure>\n

\u8b93\u65d7\u5e5f\u98c4\u63da\u7684\u6838\u5fc3\u662f\u6ce2\u6d6a\u7b97\u6cd5,\u4f7f\u7528sin()\u51fd\u5f0f\u5c07\u65d7\u5e5f\u9802\u9ede\u521d\u6b64\u5316\u70ba\u6ce2\u7d0b,\u7136\u5f8c\u6bcf\u5e40\u79fb\u52d5\u6ce2\u7d0b<\/p>\n

\u6f14\u793a\u7a0b\u5f0f:\u4e0b\u8f09<\/a><\/p>\n

    \n
  1. \u6309\u65b9\u5411\u9375\u79fb\u52d5\u76f8\u6a5f<\/li>\n
  2. \u6309ESC\u9375\u76f8\u6a5f\u8fd4\u56de\u539f\u9ede<\/li>\n<\/ol>\n

    \u7b97\u6cd5\u5982\u4e0b:<\/p>\n

      \n
    1. \u5c07\u65d7\u5e5f\u5b9a\u7fa9\u70ba\u9577\u65b9\u5f62,\u6a6b\u5411(x\u8ef8)36\u500b\u9802\u9ede,\u7e31\u5411(y\u8ef8)20\u500b\u9802\u9ede,35*19\u500b\u7db2\u683c<\/li>\n
    2. \u6ce2\u7d0b\u7b97\u6cd5: z = sin((x * height * 360) * 2 * \u03c0)<\/li>\n
    3. \u6bcf\u5e40\u6cbfZ\u8ef8\u5f80\u53f3\u79fb\u52d5\u6ce2\u7d0b\u4f86\u6a21\u64ec\u6ce2\u6d6a\u904b\u52d5,\u6700\u53f3\u7aef\u7684Z\u5ea7\u6a19\u79fb\u52d5\u5230\u6700\u5de6\u7aef<\/li>\n
    4. \u5728\u7e6a\u756b\u65d7\u5e5f\u6642\u5f9e\u5de6\u4e0b\u89d2\u958b\u6b64,\u4e00\u6b21\u7e6a\u756b\u4e00\u500bGL_QUAD\u6309\u9006\u6642\u91dd\u7e6a\u756b\u7d0b\u7406\u5ea7\u6a19\u8207\u9802\u9ede\u5ea7\u6a19<\/li>\n
    5. \u7d0b\u7406\u5ea7\u6a19:\u300es=x\/width\u300f\u300et=y\/height\u300f<\/li>\n
    6. \u65d7\u5e5f\u300e\u7d0b\u7406\u300f\u5b9a\u7fa9\u70ba\u6b63\u65b9\u5f62,\u5206\u8fa8\u7387\u8d8a\u5927\u8d8a\u597d,\u300e\u7d0b\u7406\u8f09\u5165<\/a>\u300f<\/li>\n<\/ol>\n\n\n\n\n\n\n\n
      \u65d7\u5e5f\u7d50\u69cb<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
      typedef struct FLAG_TAG{<\/td>\n<\/td>\n<\/tr>\n
      float\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 points[36][20][3];<\/td>\n\u9802\u9ede\u6578\u64da36*20\u500b\u9802\u9ede,\u6bcf\u500b\u9802\u9ede3(xyz)\u500b\u5206\u91cf<\/td>\n<\/tr>\n
      int\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time_start;<\/td>\n\u555f\u52d5\u6642\u9593\u7528\u65bc\u63a7\u5236\u6ce2\u6d6a\u79fb\u52d5\u901f\u5ea6<\/td>\n<\/tr>\n
      }FLAG, *FLAG_PTR;<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

       <\/p>\n

      \u521d\u6b64\u5316\u65d7\u5e5f\u4f7f\u7528sin()\u6ce2\u7d0b\u51fd\u5f0f\u4f86\u521d\u6b64\u5316\u65d7\u5e5f<\/p>\n

      bool Init_Flag(FLAG_PTR flag)<\/p>\n

      {<\/p>\n

      if (flag == NULL)<\/p>\n

      return false;<\/p>\n

      for (int x = 0; x < 36; ++x)<\/p>\n

      {<\/p>\n

      for (int y = 0; y < 20; ++y)<\/p>\n

      {<\/p>\n

      flag->points[x][y][0] = (float)x;\/\/ X\u8ef8<\/p>\n

      flag->points[x][y][1] = (float)y;\/\/ Y\u8ef8<\/p>\n

      float value = (x*20.0f \/ 360.0f) * 2.0f * 3.14159f;<\/p>\n

      flag->points[x][y][2] = (float)sin(value);\/\/ \u6b63\u5f26\u8a08\u7b97<\/p>\n

      }<\/p>\n

      }<\/p>\n

      return true;<\/p>\n

      }<\/p>\n

      \u7e6a\u756b\u65d7\u5e5f<\/p>\n

      void Draw_Flag(FLAG_PTR flag,float xPos,float yPos,float zPos,float xRot,float yRot,float zRot)<\/p>\n

      {<\/p>\n

      int x, y;<\/p>\n

      float left, right, top, bottom;<\/p>\n

      glPushMatrix();\/\/ \u7576\u524d\u77e9\u9663\u5806\u68e7\u58d3\u68e7<\/p>\n

      glBindTexture(GL_TEXTURE_2D, Flag_Texture.ID);\/\/ \u7d81\u5b9a\u7d0b\u7406<\/p>\n

      glTranslatef(xPos, yPos, zPos);\/\/ \u79fb\u52d5\u65d7\u5e5f\u5ea7\u6a19<\/p>\n

      glRotatef(xRot, 1.0f, 0.0f, 0.0f); \/\/ \u7e5eX\u8ef8\u65cb\u8f49\u65d7\u5e5f<\/p>\n

      glRotatef(yRot, 0.0f, 1.0f, 0.0f); \/\/ \u7e5eY\u8ef8\u65cb\u8f49\u65d7\u5e5f<\/p>\n

      glRotatef(zRot, 0.0f, 0.0f, 1.0f); \/\/ \u7e5eZ\u8ef8\u65cb\u8f49\u65d7\u5e5f<\/p>\n

      glBegin(GL_QUADS);\/\/ \u7e6a\u756b\u6728\u7bb1\u9802\u9762\u7d0b\u7406\u5ea7\u6a19\u548c\u9802\u9ede\u5ea7\u6a19<\/p>\n

      \/\/ \u904d\u6b77\u65d7\u5e5f\u6240\u6709\u9802\u9ede,\u9664\u4e86\u65b9\u5411\u4e0a\u7684\u6700\u5f8c\u5169\u500b\u9ede<\/p>\n

      \/\/ \u56e0\u70ba\u53ea\u662f\u7528\u5b83\u4f86\u7e6a\u88fd\u6bcf\u500b\u65b9\u5411\u4e0a\u6700\u5f8c\u7684GL_QUAD<\/p>\n

      for (x = 0; x < 35; ++x)<\/p>\n

      {<\/p>\n

      for (y = 0; y < 18; ++y)<\/p>\n

      {\u00a0\u00a0 \/\/ \u70ba\u7576\u524d\u7684\u56db\u908a\u5f62\u8a08\u7b97\u7d0b\u7406\u5ea7\u6a19<\/p>\n

      left = (float)x \/ 35.0f;\u00a0 \/\/\u56db\u908a\u5f62\u5de6\u5247\u7684\u7d0b\u7406\u5ea7\u6a19<\/p>\n

      bottom = (float)y \/ 18.0f ;\/\/\u56db\u908a\u5f62\u9802\u5247\u7684\u7d0b\u7406\u5ea7\u6a19<\/p>\n

      right = (float)(x+1) \/ 35.0f; \/\/\u56db\u908a\u5f62\u53f3\u5247\u7684\u7d0b\u7406\u5ea7\u6a19<\/p>\n

      top = (float)(y+1) \/ 18.0f ;\u00a0\u00a0 \/\/\u56db\u908a\u5f62\u5e95\u5247\u7684\u7d0b\u7406\u5ea7\u6a19<\/p>\n

      \/\/ \u8a2d\u5b9a\u56db\u908a\u5f62\u5de6\u4e0b\u89d2\u7684\u7d0b\u7406\u5ea7\u6a19\u8207\u9802\u9ede\u5ea7\u6a19<\/p>\n

      glTexCoord2f(left, bottom);\/\/ \u7d0b\u7406\u5ea7\u6a19<\/p>\n

      glVertex3f(flag->points[x][y][0],<\/p>\n

      flag->points[x][y][1],<\/p>\n

      flag->points[x][y][2]);\/\/\u9802\u9ede\u5ea7\u6a19<\/p>\n

      \/\/ \u8a2d\u5b9a\u56db\u908a\u5f62\u53f3\u4e0b\u89d2\u7684\u7d0b\u7406\u5ea7\u6a19\u8207\u9802\u9ede\u5ea7\u6a19<\/p>\n

      glTexCoord2f(right, bottom);\/\/ \u7d0b\u7406\u5ea7\u6a19<\/p>\n

      glVertex3f(flag->points[x+1][y][0],<\/p>\n

      flag->points[x+1][y][1],<\/p>\n

      flag->points[x+1][y][2]);\/\/\u9802\u9ede\u5ea7\u6a19<\/p>\n

      \/\/ \u8a2d\u5b9a\u56db\u908a\u5f62\u53f3\u4e0a\u89d2\u7684\u7d0b\u7406\u5ea7\u6a19\u8207\u9802\u9ede\u5ea7\u6a19<\/p>\n

      glTexCoord2f(right, top);\/\/ \u7d0b\u7406\u5ea7\u6a19<\/p>\n

      glVertex3f(flag->points[x+1][y+1][0],<\/p>\n

      flag->points[x+1][y+1][1],<\/p>\n

      flag->points[x+1][y+1][2]);\/\/\u9802\u9ede\u5ea7\u6a19<\/p>\n

      \/\/ \u8a2d\u5b9a\u56db\u908a\u5f62\u5de6\u4e0a\u89d2\u7684\u7d0b\u7406\u5ea7\u6a19\u8207\u9802\u9ede\u5ea7\u6a19<\/p>\n

      glTexCoord2f(left, top);\/\/ \u7d0b\u7406\u5ea7\u6a19<\/p>\n

      glVertex3f(flag->points[x][y+1][0],<\/p>\n

      flag->points[x][y+1][1],<\/p>\n

      flag->points[x][y+1][2]);\/\/\u9802\u9ede\u5ea7\u6a19<\/p>\n

      }<\/p>\n

      }<\/p>\n

      glEnd();<\/p>\n

      DWORD tick = GetTickCount(); \/\/\u8fd4\u56de\u5f9e\u64cd\u4f5c\u7cfb\u7d71\u555f\u52d5\u6240\u7d93\u904e\u7684\u6beb\u79d2\u6578<\/p>\n

      if ((tick – flag->time_start) > 100)<\/p>\n

      {<\/p>\n

      flag->time_start = tick;<\/p>\n

      float wrap;<\/p>\n

      \/\/ \u751f\u6210\u65d7\u5e5f\u7684\u904b\u52d5<\/p>\n

      \/\/ \u8a2a\u554f\u65d7\u5e5f\u4e2d\u7684\u6bcf\u4e00\u9ede,\u5c07\u6bcf\u9ede\u7684Z\u8ef8\u5ea7\u6a19\u5411\u53f3\u79fb\u52d5\u4e00\u4f4d\u4f86\u6a21\u64ec\u6ce2\u6d6a\u904b\u52d5<\/p>\n

      for (y = 0; y < 19; ++y)\/\/ Y\u8ef8\u65b9\u5411\u5faa\u74b0<\/p>\n

      {\/\/ \u5b58\u5132\u6b64\u884c\u4e2d\u6700\u53f3\u7aef\u9802\u9ede\u7684Z\u5ea7\u6a19<\/p>\n

      wrap = flag->points[35][y][2];<\/p>\n

      for (x = 35; x >= 0; –x)\/\/ X\u8ef8\u65b9\u5411\u5faa\u74b0<\/p>\n

      {\/\/ \u5c07\u7576\u524d\u9802\u9edeZ\u5ea7\u6a19\u8a2d\u70ba\u524d\u4e00\u9802\u9ede\u7684Z\u5ea7\u6a19\u503c<\/p>\n

      flag->points[x][y][2] = flag->points[x-1][y][2];<\/p>\n

      }<\/p>\n

      \/\/ \u5c07\u6700\u5de6\u7aef\u9802\u9ede\u7684Z\u5ea7\u6a19\u8a2d\u70ba\u5148\u524d\u6240\u5b58\u5132\u7684wrap<\/p>\n

      flag->points[0][y][2] = wrap;<\/p>\n

      }<\/p>\n

      }<\/p>\n

      glPopMatrix();\/\/ \u7576\u524d\u77e9\u9663\u5806\u68e7\u51fa\u68e7<\/p>\n

      }<\/p>\n

       <\/p>\n","protected":false},"excerpt":{"rendered":"

      \u8b93\u65d7\u5e5f\u98c4\u63da\u7684\u6838\u5fc3\u662f\u6ce2\u6d6a\u7b97\u6cd5,\u4f7f\u7528sin()\u51fd\u5f0f\u5c07\u65d7\u5e5f\u9802\u9ede\u521d\u6b64\u5316\u70ba\u6ce2\u7d0b,\u7136\u5f8c\u6bcf\u5e40\u79fb\u52d5\u6ce2\u7d0b \u6f14\u793a\u7a0b\u5f0f:\u4e0b\u8f09 \u6309\u65b9\u5411 … <\/p>\n

      \u7e7c\u7e8c\u95b1\u8b80 OpenGL\u4e4b\u65d7\u5e5f\u98c4\u63da<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[50],"class_list":["post-3842","post","type-post","status-publish","format-standard","hentry","category-opengl","tag-opengl","entry"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/comments?post=3842"}],"version-history":[{"count":7,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3842\/revisions"}],"predecessor-version":[{"id":3984,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3842\/revisions\/3984"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=3842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=3842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=3842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}