#include?“Camera.h“

#include?
#include?
#include?

using?namespace?std;

Camera::Camera（）
{
????_world_BLx?=?0;
????_world_BLy?=?0;
????_world_W?=?1;
????_world_H?=?1;
????_window_W?=?100;
????_window_H?=?100;
????_fb_W?=?100;
????_fb_H?=?100;
????_window?=?NULL;
}

Camera::Camera（double?world_BLx?double?world_BLy
???????????????????double?world_W?double?world_H
???????????????int?window_W?int?window_H
???????????????GLFWwindow*?window）
{
????_world_BLx?=?world_BLx;
????_world_BLy?=?world_BLy;
????_world_W?=?world_W;
????_world_H?=?world_H;
????_window_W?=?window_W;
????_window_H?=?window_H;
????_fb_W?=?window_W;
????_fb_H?=?window_H;
????_window?=?window;
}

void?Camera::mouse_to_world（int?mx?int?my??double?&wx?double?&wy）
{
????int?vx?=?mx;
????int?vy?=?（int）（_window_H?-?my）;

????viewport_to_world（vx?vy?wx?wy）;
}

void?Camera::viewport_to_world（int?vx?int?vy??double?&wx?double?&wy）
{
????double?x_fraction?=?vx?/?_window_W;
????double?y_fraction?=?vy?/?_window_H;

//????cout?<
????wx?=?_world_BLx?+?x_fraction?*?_world_W;
????wy?=?_world_BLy?+?y_fraction?*?_world_H;
}

void?Camera::world_to_viewport（double?wx?double?wy
???????????????????????????????int&?vx?int&?vy）?{
????vx?=?（int）（（wx?-?_world_BLx）?/?_world_W?*?_window_W?+?0.5）;
????vy?=?（int）（（wx?-?_world_BLy）?/?_world_H?*?_window_H?+?0.5）;
}

void?Camera::begin_drawing（）
{
????glViewport（00?（int）_fb_W?（int）_fb_H）;
????glMatrixMode（GL_PROJECTION）;
????glLoadIdentity（）;
????double?half_W?=?_world_W?/?2;
????double?half_H?=?_world_H?/?2;
????glOrtho（-half_W?+half_W
????????????-half_H?+half_H
????????????0?100）;

????glMatrixMode（GL_MODELVIEW）;
????glLoadIdentity（）;
????glTranslated（-（_world_BLx?+?half_W）
?????????????????-（_world_BLy?+?half_H）
?????????????????-1）;
}

void?Camera::check_resize（）
{
????int?width?height;

????glfwGetframebufferSize（_window?&width?&height）;
????_fb_W?=?width;
????_fb_H?=?height;
}

void?Camera::draw_grid（double?minor_spacing?double?major_spacing）
{
????double?xy;

????glDisable（GL_DEPTH_TEST）;

????glLineWidth（1）;???????//?lines?as?thin?as?possible

????glBegin（GL_LINES）;??????//?every?two?glVertex?calls?will?draw?a?line?segment

????double?left???=?（int）（_world_BLx?-?1）;
????double?right??=?left?+?_world_W?+?3;
????double?bottom?=?（int）（_world_BLy?-?1）;
????double?top????=?bottom?+?_world_H?+?3;

????//?the?minor?vertical?grid?lines
????glColor3d（0.6?0.4?0.4）;????//?darkish?red
????for?（x?=?left;?x?<=?right;?x?+=?minor_spacing）
????{
????????glVertex2d（x?bottom）;
????????glVertex2d（x?top）;
????}
????//?the?minor?horizontal?grid?lines
????for?（y?=?bottom;?y?<=?top;?y?+=?minor_spacing）
????{
????????glVertex2d（left??y）;
????????glVertex2d（right?y）;
????}

????//?the?major?vertical?grid?lines:?darkish?green
????gl

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????3625??2017-11-26?18:14??Camera.cpp
?????文件????????1929??2017-11-03?14:11??Camera.h