{"id":3486,"date":"2018-01-07T23:49:24","date_gmt":"2018-01-07T15:49:24","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3486"},"modified":"2018-10-14T21:32:13","modified_gmt":"2018-10-14T13:32:13","slug":"opengl_point","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_point\/","title":{"rendered":"OpenGL\u4e4b\u7e6a\u756b\u9802\u9ede"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u7e6a\u756b\u9802\u9ede<\/figcaption><\/figure>\n

OpenGL\u652f\u6301\u57fa\u672c\u5e7e\u4f55\u9802\u9ede\u7e6a\u756b,\u4f7f\u7528glVertex()\u751f\u6210\u756b\u9ede\u7684\u6f14\u793a\u7a0b\u5f0f\u5982\u4e0a\u5716:\u4e0b\u8f09<\/a><\/p>\n

    \n
  1. \u6309\u9f20\u6a19\u5de6\u9375\u7e6a\u756b\u9802\u9ede<\/li>\n
  2. \u6309+\u9375\u52a0\u5927\u9802\u9ede\u5c3a\u5bf8<\/li>\n
  3. \u6309-\u9375\u6e1b\u5c0f\u9802\u9ede\u5c3a\u5bf8<\/li>\n
  4. \u6309S\u9375\u5207\u63db\u6297\u92f8\u9f52\u529f\u80fd<\/li>\n
  5. \u63091\u9375\u5207\u63db\u70ba\u767d\u8272<\/li>\n
  6. \u63092\u9375\u5207\u63db\u70ba\u9ec3\u8272<\/li>\n
  7. \u63093\u9375\u5207\u63db\u70ba\u7d05\u8272<\/li>\n<\/ol>\n

    \u7e6a\u756b\u55ae\u500b\u9802\u9ede<\/p>\n

      \n
    1. glPointSize(size);\u8a2d\u7f6e\u9802\u9ede\u7684\u5927\u5c0f<\/li>\n
    2. glBegin(GL_POINTS); \u6e96\u5099\u7e6a\u756b<\/li>\n
    3. glVertex3f(x,y,z); \u7e6a\u756b\u9802\u9ede(\u6d6e\u9ede\u6578\u7248)<\/li>\n
    4. glVertex3i(x,y,z); \u7e6a\u756b\u9802\u9ede(\u6574\u6578\u7248)<\/li>\n
    5. glEnd(); \u7d50\u675f\u7e6a\u756b<\/li>\n<\/ol>\n

      \u56e0\u5c4f\u5e55\u7531\u50cf\u7d20\u7d44\u6210,\u7e2e\u653e\u9802\u9ede\u6642\u908a\u7de3\u6703\u7522\u751f\u92f8\u9f52,OpenGL\u6709\u5176\u6297\u92f8\u9f52\u7b97\u6cd5,\u555f\u7528\u5f8c\u9802\u5b9a\u6703\u7531\u65b9\u8b8a\u5713,\u4e26\u4fee\u6539\u908a\u7de3\u50cf\u7d20\u7684\u984f\u8272:<\/p>\n

      if (glIsEnabled(GL_POINT_SMOOTH) == false)\/\/ \u5224\u65b7\u6297\u92f8\u9f52\u662f\u5426\u5df2\u555f\u7528<\/p>\n

      {<\/p>\n

      glEnable(GL_POINT_SMOOTH); \/\/ \u555f\u7528\u9802\u9ede\u7684\u5e73\u6ed1\u6a21\u5f0f(\u6297\u92f8\u9f52\u529f\u80fd)<\/p>\n

      glEnable(GL_BLEND);\/\/ \u9700\u555f\u7528\u6df7\u5408<\/p>\n

      }<\/p>\n

      \u958b\u555f\u6297\u92f8\u9f52\u7b97\u6cd5\u5f8c,\u9802\u9ede\u5c3a\u5bf8\u7bc4\u570d\u53d7\u5230\u9650\u5236,\u82e5\u8f38\u5165\u4e0d\u53d7\u652f\u6301\u9802\u9ede\u7684\u5c3a\u5bf8,\u6703\u6539\u70ba\u6700\u63a5\u8fd1\u7684\u652f\u6301\u6578\u503c:<\/p>\n

        \n
      1. GLfloat sizes[2];\u6d6e\u9ede\u6578\u6578\u7d44<\/li>\n
      2. glGetFloatv(GL_POINT_SIZE_RANGE,sizes);\u63d0\u53d6\u9802\u9ede\u5c3a\u5bf8\u7684\u7bc4\u570d<\/li>\n
      3. GLfloat min = sizes[0];\u6700\u5c0f<\/li>\n
      4. GLfloat max = sizes[1];\u6700\u5927<\/li>\n
      5. GLfloat granularity;<\/li>\n
      6. glGetFloatv(GL_POINT_SIZE_GRANULARITY,&granularity);\u63d0\u53d6\u9802\u9ede\u5c3a\u5bf8\u7684\u7c92\u5ea6<\/li>\n
      7. GLfloat size;<\/li>\n
      8. glGetFloatv(GL_POINT_SIZE,&size);\u7372\u53d6\u7576\u524d\u9802\u9ede\u5c3a\u5bf8<\/li>\n
      9. size = size + granularity;\u52a0\u5927<\/li>\n<\/ol>\n