OpenGL（三）特殊按键，控制三角形移动

来源：互联网发布：kali linux安装到u盘编辑：程序博客网时间：2024/06/04 23:29

一、代码

1.在上篇代码中新增代码

//key,特殊按键编码，x,y位置void SpecialKeys(int key, int x, int y){GLfloat stepSize = 0.025f;  //增加的步量GLfloat blockX = 0; GLfloat blockY = 0;//上if (key == GLUT_KEY_UP){blockY += stepSize;}//下if (key == GLUT_KEY_DOWN){blockY -= stepSize;}//左if (key == GLUT_KEY_LEFT){blockX -= stepSize;}//右if (key == GLUT_KEY_RIGHT){blockX += stepSize;}std::cout << "blockX = " << blockX << std::endl;std::cout << "blockY = " << blockY << std::endl;//改变顶点数据vVertex[0] = vVertex[0] + blockX;vVertex[1] = vVertex[1] + blockY;vVertex[3] = vVertex[3] + blockX;vVertex[4] = vVertex[4] + blockY;vVertex[6] = vVertex[6] + blockX;vVertex[7] = vVertex[7] + blockY;batch.CopyVertexData3f(vVertex); //复制顶点到批处理中glutPostRedisplay(); //更新窗口内容}

glutSpecialFunc(SpecialKeys);         //特殊按键回调

2.完整代码

#include <GLTools.h>#include <GLShaderManager.h>#include <GL/glut.h>GLBatch batch; //批处理GLShaderManager shaderManager; //着色器管理//定义顶点数据GLfloat vVertex[] = { -0.5f, -0.5f, 0.0f,  0.5f, -0.5f, 0.0f,  0.0f, 0.5f, 0.0f };void ChangeSize(int width, int height){glViewport(0, 0, width, height);  //改变窗口大小}void SetupRc(void){glClearColor(0.0f, 0.0f, 1.0f, 1.0f);    //背景颜色shaderManager.InitializeStockShaders();  //初始化着色器batch.Begin(GL_TRIANGLES, 3);batch.CopyVertexData3f(vVertex);  //复制顶点数据到批处理中batch.End();}void MyDisplay(void){glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); //清除特定的缓冲区GLfloat vRed[] = { 0.0f, 1.0f, 0.0f, 1.0f };  //RGBAshaderManager.UseStockShader(GLT_SHADER_IDENTITY ,vRed);  //颜色传递到存储着色器中batch.Draw();        //绘制glutSwapBuffers();   //交换buffer，双缓冲}//key,特殊按键编码，x,y位置void SpecialKeys(int key, int x, int y){GLfloat stepSize = 0.025f;  //增加的步量GLfloat blockX = 0;GLfloat blockY = 0;//上if (key == GLUT_KEY_UP){blockY += stepSize;}//下if (key == GLUT_KEY_DOWN){blockY -= stepSize;}//左if (key == GLUT_KEY_LEFT){blockX -= stepSize;}//右if (key == GLUT_KEY_RIGHT){blockX += stepSize;}//改变顶点数据vVertex[0] = vVertex[0] + blockX;vVertex[1] = vVertex[1] + blockY;vVertex[3] = vVertex[3] + blockX;vVertex[4] = vVertex[4] + blockY;vVertex[6] = vVertex[6] + blockX;vVertex[7] = vVertex[7] + blockY;batch.CopyVertexData3f(vVertex); //复制顶点到批处理中glutPostRedisplay(); //更新窗口内容}int main(int argc, char * argv[]){gltSetWorkingDirectory(argv[0]);   //设置工作目录glutInit(&argc, argv);             //初始化glutglutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL); //显示类型模式glutInitWindowSize(800, 600);      //窗口大小glutCreateWindow("第一个OpenGL");  //创建窗口glutReshapeFunc(ChangeSize);       //改变窗口大小glutDisplayFunc(MyDisplay);        //显示绘制回调glutSpecialFunc(SpecialKeys);         //特殊按键回调GLenum err = glewInit();           //驱动程序初始化过程是否出错if (err != GLEW_OK){return 1;}SetupRc();                         glutMainLoop();                    //调用之后才能显示return 0;}

二、运行效果

按上下左右键移动三角形

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