GL畫線 畫三角形方法

gl劃線

glbegin(gl_lines);//start to draw something

glvertex3f(0.0f, 0.0f, -10.0f); 
glvertex3f(-5.0f, 0.0f, -10.0f);
glvertex3f(-5.0f, 0.0f, -10.0f);
glvertex3f(-5.0f, -2.0f, -10.0f);

gl畫收尾相接的線

glbegin(gl_line_strip);//start to draw something

glvertex3f(0.0f, 0.0f, -10.f); 
glvertex3f(-5.0, 0.0f, -10.f);
glvertex3f(-5.0f, -2.0f, -10.f);

gl畫線收尾相接的環

glbegin(gl_line_loop);//start to draw something

glvertex3f(0.0f, 0.0f, -10.f); 
glvertex3f(-5.0, 0.0f, -10.f);
glvertex3f(-5.0f, -2.0f, -10.f);

彩帶，更改當前點的顏色  :漸變差值

glbegin(gl_line_loop);//start to draw something

glcolor4ub(255, 0, 0, 255); 
glvertex3f(0.0f, 0.0f, -10.f);
glcolor4ub(0, 255, 0, 255); 
glvertex3f(-5.0, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255);
glvertex3f(-5.0f, -2.0f, -10.f);
glend(); //end

gl畫三角形

glbegin(gl_********s);//start to draw something

glcolor4ub(255, 0, 0, 255); 
glvertex3f(0.0f, 0.0f, -10.f);
glcolor4ub(0, 255, 0, 255); 
glvertex3f(-5.0, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255); 
glvertex3f(-5.0f, -2.0f, -10.f);
glend(); //end

glenable(gl_cull_face);//擦除正面->逆時針

glenable(gl_cull_face);//擦除背面	順時針背面， 逆時針正面  攝像機點如何連線的		

//front face:cow :ccw-> counter clock wind
glfrontface(gl_cull_face);
//將順時針，逆時針互換

glbegin(gl_********s);//start to draw something

glcolor4ub(255, 0, 0, 255); 
glvertex3f(0.0f, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255); 
glvertex3f(-5.0f, -2.0f, -10.f);
glcolor4ub(0, 255, 0, 255); 
glvertex3f(-5.0, 0.0f, -10.f);
glend(); //end

兩個三角形

glvertex3f(0.0f, 0.0f, -10.f);

glcolor4ub(0, 255, 0, 255); 
glvertex3f(-5.0, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255); 
glvertex3f(-5.0f, -2.0f, -10.f);
glcolor4ub(255, 0, 0, 255);
glvertex3f(0.0f, 0.0f, -10.f);
glcolor4ub(0, 255, 0, 255);
glvertex3f(5.0, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255);
glvertex3f(5.0f, -2.0f, -10.f);
glend(); //end

glbegin(gl_********_strip);//start to draw something

//遇到奇數點 -> n+1- >n+2 順序連線 遇到偶點 n+1->n->n+2畫n-2個三角形
glcolor4ub(255, 0, 0, 255); 
glvertex3f(0.0f, 0.0f, -10.f);
glcolor4ub(0, 255, 0, 255); 
glvertex3f(-5.0, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255); 
glvertex3f(-5.0f, -2.0f, -10.f);
glcolor4ub(255, 0, 0, 255);
glvertex3f(5.0f, 0.0f, -10.f);
glcolor4ub(0, 255, 0, 255);
glvertex3f(0.0, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255);
glvertex3f(0.0f, -2.0f, -10.f);

三角形扇

glbegin(gl_********_fan);//start to draw something

glcolor4ub(255, 0, 0, 255); 
glvertex3f(0.0f, 0.0f, -10.f);
glcolor4ub(0, 0, 255, 255);
glvertex3f(-5.0, -2.0f, -10.f);
glcolor4ub(0, 255, 0,255); 
glvertex3f(-3.0f, -2.0f, -10.f);
glcolor4ub( 0, 0, 255,255);
glvertex3f(-1.0f, -2.0f, -10.f);

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