C++ FPS游戏坐标转屏幕坐标的类库源码

ytn2001

C++ FPS游戏坐标转屏幕坐标的类库源码

这份代码矩阵部分是4x4矩阵的，如果你的游戏人物矩阵不是4x4的就自己改一下那里的代码就能用了。

1. #pragma once
   
2. #include <windows.h>
   
3. 
   
4. typedef struct _WORD_LOCATION_
   
5. {
   
6.     float x;
   
7.     float y;
   
8.     float z;
   
9. }WORD_LOCATION;
   
10. 
    
11. typedef struct _CUT_COOR_
    
12. {
    
13.     float x;
    
14.     float y;
    
15.     float z;
    
16.     float w;
    
17. }CUT_COOR;
    
18. 
    
19. typedef struct _NDC_COOR_
    
20. {
    
21.     float x;
    
22.     float y;
    
23.     float z;
    
24. }NDC_COOR;
    
25. 
    
26. typedef struct _SCREEN_COOR_
    
27. {
    
28.     float x;
    
29.     float y;
    
30. }SCREEN_COOR;
    
31. 
    
32. typedef struct _SCREEN_PARAM_
    
33. {
    
34.     float height;
    
35.     float width;
    
36. }SCREEN_PARAM;
    
37. 
    
38. class World2Screen
    
39. {
    
40. public:
    
41.     float PersonMatrix[4][4];
    
42.     WORD_LOCATION WordLocation;
    
43.     CUT_COOR CutCoor;
    
44.     NDC_COOR NDCCoor;
    
45.     SCREEN_COOR ScreenCoor;
    
46.     SCREEN_PARAM ScreenParam;
    
47. public:
    
48.     World2Screen(WORD_LOCATION Word, float* PersonMatrix);
    
49.     void Word2CutCoor();
    
50.     bool InVisualField();
    
51.     void Cut2NDCCoor();
    
52.     void NDC2ScreenCoor();
    
53. 
    
54. };
    

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1. #include "World2Screen.h"
   
2. 
   
3. World2Screen::World2Screen(WORD_LOCATION Word, float* PersonMatrix)
   
4. {
   
5.     this->WordLocation.x = Word.x;
   
6.     this->WordLocation.y = Word.y;
   
7.     this->WordLocation.z = Word.z;
   
8.     memcpy_s(this->PersonMatrix,sizeof(this->PersonMatrix),PersonMatrix,sizeof(this->PersonMatrix));
   
9. }
   
10. 
    
11. void World2Screen::Word2CutCoor()
    
12. {   
    
13.     this->CutCoor.x = this->PersonMatrix[0][0] * this->WordLocation.x + this->PersonMatrix[0][1] * this->WordLocation.y + this->PersonMatrix[0][2] * this->WordLocation.z + this->PersonMatrix[0][3];
    
14.     this->CutCoor.y = this->PersonMatrix[1][0] * this->WordLocation.x + this->PersonMatrix[1][1] * this->WordLocation.y + this->PersonMatrix[1][2] * this->WordLocation.z + this->PersonMatrix[1][3];
    
15.     this->CutCoor.z = this->PersonMatrix[2][0] * this->WordLocation.x + this->PersonMatrix[2][1] * this->WordLocation.y + this->PersonMatrix[2][2] * this->WordLocation.z + this->PersonMatrix[2][3];
    
16.     this->CutCoor.w = this->PersonMatrix[3][0] * this->WordLocation.x + this->PersonMatrix[3][1] * this->WordLocation.y + this->PersonMatrix[3][2] * this->WordLocation.z + this->PersonMatrix[3][3];
    
17. }
    
18. 
    
19. bool World2Screen::InVisualField()
    
20. {
    
21.     if (this->CutCoor.w < 0.01) { return false; };
    
22. }
    
23. 
    
24. void World2Screen::Cut2NDCCoor()
    
25. {
    
26.     this->NDCCoor.x = this->CutCoor.x / this->CutCoor.w;
    
27.     this->NDCCoor.y = this->CutCoor.y / this->CutCoor.w;
    
28.     this->NDCCoor.z = this->CutCoor.z / this->CutCoor.w;
    
29. }
    
30. 
    
31. void World2Screen::NDC2ScreenCoor()
    
32. {
    
33.     this->ScreenCoor.x = this->ScreenParam.width / 2 + (this->ScreenParam.width / 2) * this->NDCCoor.x;
    
34.     this->ScreenCoor.y = this->ScreenParam.height / 2 - (this->ScreenParam.height / 2) * this->NDCCoor.y;
    
35. }
    

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