# week16
## week16-0
freeglut
opencv
設定codeblock
小心:add PATH
小心:目錄不要改
小心:重開codeblocks
codeblocks: setting-compiler
Search directories的Compiler: C:\OpenCV2.1\include
Search directories的Linker: C:\OpenCV2.1\lib
Linker setting: cv210 cxcore210 highgui210
1.
https://jsyeh.org/3dcg10/
download---win32、data
解壓縮
data放進win32
week16-1_sample_gluLookAt
1.加一行
2.可以調整注視的位置
想要在按按鍵時，調整看不同的地方
if(key=='1'); 看左上方...
week16-2_glut_glutReshapeFunc_glutPerspective_gluLookAt
請先看課本project.exe 範例
gluPerspective 透視投影
glOrtho 垂直投影
glFrustum 比較奇怪，我們通常不用他的投影法
左右上下遠近 共六個參數
gluPerspective (視角，長寬比，Z近，Z遠)
fovy = field of view in y視角
aspect ratio 長寬比
我們將要寫的程式，11行加8行 ，做出透視投影
1.11行
2.加上八行
```cpp
void reshape(int w,int h) {
glViewport(0,0,w,h);///設定視窗會看到的區域
float ar = w/(float) h;///長寬比、寬長比
glMatrixMode(GL_PROJECTION);///切換投影矩陣
glLoadIdentity();
gluPerspective(60,ar,0.01,100);///透視投影
glMatrixMode(GL_MODELVIEW);///切換model view矩陣
glLoadIdentity();
gluLookAt(0,2,-2, 0,0,0, 0,1,0);
}
```
glutInitWindowSize(300,600); ///加這行可改視窗長寬///增加預設長寬
glutReshapeFunc(reshape);
```
##week16-3_myTexture_id2_glBindTexture
若想要有「兩張貼圖」(一張背景、一張給模型)
1.用week5-3的程式碼
2.圖檔記得放C槽
```cpp
#include <opencv/highgui.h> ///使用 OpenCV 2.1 比較簡單, 只要用 High GUI 即可
#include <opencv/cv.h>
#include <GL/glut.h>
GLUquadric * quad = NULL; ///todo: 要有一顆指標
int id1,id2;///準備兩個整數存貼圖
int myTexture(char * filename)
{
IplImage * img = cvLoadImage(filename); ///OpenCV讀圖
cvCvtColor(img,img, CV_BGR2RGB); ///OpenCV轉色彩 (需要cv.h)
glEnable(GL_TEXTURE_2D); ///1. 開啟貼圖功能
GLuint id; ///準備一個 unsigned int 整數, 叫 貼圖ID
glGenTextures(1, &id); /// 產生Generate 貼圖ID
glBindTexture(GL_TEXTURE_2D, id); ///綁定bind 貼圖ID
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖T, 就重覆貼圖
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖S, 就重覆貼圖
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); /// 貼圖參數, 放大時的內插, 用最近點
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); /// 貼圖參數, 縮小時的內插, 用最近點
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);
return id;
}
///再貼上10行GLUT程式 (不要貼剛剛的程式)
float angle = 0;
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glBindTexture(GL_TEXTURE_2D,id2);
glBegin(GL_POLYGON);
glTexCoord2f(0,0); glVertex2f(-1,+1);
glTexCoord2f(0,1); glVertex2f(-1,-1);
glTexCoord2f(1,1); glVertex2f(+1,-1);
glTexCoord2f(1,0); glVertex2f(+1,+1);
glEnd();
glBindTexture(GL_TEXTURE_2D,id1);
glPushMatrix();
glRotatef(90, 1, 0, 0);
glRotatef(angle++, 0, 0, 1);
///gluSphere(quad, 1, 30, 30); ///glutSolidTeapot( 0.3 );
gluSphere(quad,0.5,30,30);
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char*argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutInitWindowSize(500,500);
glutCreateWindow("week05");
glutIdleFunc(display);
glutDisplayFunc(display);
id2 = myTexture("c:/111.jpg");
id1 = myTexture("c:/earth.jpg");
quad = gluNewQuadric(); ///todo:把這顆指標,指好
gluQuadricTexture(quad, 1);///todo: 做好地球的貼圖
glutMainLoop();
}
```
沒有留言:
張貼留言