基于opengl的RoundBox绘制(转)
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实现了16种roundBox，见图
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#include <cstdlib> #include <GL/glut.h> #include <cmath> #include <ctime> //#include "BezierLinkRender.h" #include "RoundBoxRender.h" ////////////////////////////////////////////////// //global GLuint gColorStable[] = { (0xFF0000), //red (0xDC143C), //crimson (0x9400D3), //violet (0xFFA000), //orange (0xFFFF00), //yellow (0xFFD700), //glod (0x00FF00), //green (0x90FF90), //lightgreen (0x006400), //darkgreen (0x556B2F), //olivegreen //very good color绿橄榄 (0x0000FF), //blue (0x00008B), //darkblue (0x4169E1), //royalblue (0x5555FF), //skyblue (0x191970), //midnightbue (0xFF00FF), //fuchsia (0x00FFFF), //aqua (0xffb6c1), //pink (0xFF91A4), //salmonpink (0x30D5C8), //turquoise (0x008080), //darkturpuoise (0xA9A9A9), //gray (0xD3D3D3), //lightgray (0x808080) //darkgray }; float g_fWidth = 500; float g_fHeight = 500; float g_fDepth = 100; float g_fAngle = .0; int gRoundboxtype = 0; ////////////////////////////////////////////////////////////////////////// void renderBitmapString2D(float x, float y, void *font, char *string); void getColorFromTable(GLuint rgb, float vec[3]); void init(void) { RoundBoxRender::setType(gRoundboxtype); printf("%d\n", gRoundboxtype); glClearColor (0.9, 0.9, 0.9, 0.0); glShadeModel (GL_SMOOTH); } void display(void) { const float slotSize = 30.f; const float slotColor[] = {0.8f, 0.8f, 0.8f}; const float slotShadowSize = 2.0f; const float slotShadowAlpha = 0.7; glClear (GL_COLOR_BUFFER_BIT); glColor3f (1.0, 1.0, 1.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, g_fWidth, 0, g_fHeight, 0, g_fDepth); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(80.f, 80.f, 0.f); //整体平移 int xPos(0); int yPos(0); int xOffset(0); int yOffset(0); for (int i=0; i<16; i++) { char buffer[10] = {'\0'}; itoa (i,buffer,10); int fontWidOffset = i>10 ? 12 : 5; //估算量 int fontHghOffset = 10; //估算量 int boxSize = 60; float colorVec[3]; getColorFromTable(gColorStable[i], colorVec); glColor3fv(colorVec); RoundBoxRender::setType(i); yOffset = i/4; xOffset = i%4; glPushMatrix(); { glTranslatef(xPos+xOffset*100, yPos+yOffset*100, 0.f); RoundBoxRender::gl_round_box_shade(GL_POLYGON, 0, 0, boxSize, boxSize, 10, 0.3, 0); glColor3f(0.f, 0.f, 0.0f); renderBitmapString2D(boxSize/2-fontWidOffset, boxSize/2-fontHghOffset, GLUT_BITMAP_TIMES_ROMAN_24, buffer); }glPopMatrix(); } //glColor3f(1.0f, 1.0f, 0.0f); //ui_draw_link_bezier(&gRect); glutSwapBuffers(); } void reshape (int w, int h) { glViewport (0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective(60,1.0,1.5,20); glMatrixMode (GL_MODELVIEW); } void keyboard(unsigned char key, int x, int y) { switch (key) { case 27: exit(0); break; } glutPostRedisplay(); } void mouse(int button, int state, int x, int y) { if(button==GLUT_LEFT_BUTTON) switch(state) { case GLUT_DOWN: break; case GLUT_UP: break; } glutPostRedisplay(); } int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100); glutCreateWindow (argv[0]); init (); glutDisplayFunc(display); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); glutMouseFunc( mouse ); glutMainLoop(); return 0; } void renderBitmapString2D(float x, float y, void *font, char *string) { char *c; // set position to start drawing fonts glRasterPos2f(x, y); // loop all the characters in the string for (c=string; *c != '\0'; c++) { glutBitmapCharacter(font, *c); } } void getColorFromTable(GLuint rgb, float vec[3]) { GLubyte r = GLubyte ((rgb >> 16) & 0xFF); GLubyte g = GLubyte ((rgb >> 8) & 0xFF); GLubyte b = GLubyte (rgb & 0xFF); vec[0] = r / 255.0f; vec[1] = g / 255.0f; vec[2] = b / 255.0f; } 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/dizuo/archive/2010/07/08/5721751.aspx?ER_H
#define ROUNDBOXRENDER_H // 7/8/2010 RYF // QQ: 546952710 // Email: dizuo@126.com struct RoundBoxRender { // 产生一个渐变的效果： // shadetop叠加top // shadedown叠加到down 可以为负 // rad为圆角的半径 /* linear horizontal shade within button or in outline */ /* view2d scrollers use it */ static void gl_round_box_shade(int mode, float minx, float miny, float maxx, float maxy, float rad, float shadetop, float shadedown) { float vec[7][2]= {{0.195, 0.02}, {0.383, 0.067}, {0.55, 0.169}, {0.707, 0.293}, {0.831, 0.45}, {0.924, 0.617}, {0.98, 0.805}}; float div= maxy-miny; float coltop[3], coldown[3], color[4]; int a; /* mult */ for(a=0; a<7; a++) { vec[a][0]*= rad; vec[a][1]*= rad; } /* get current color, needs to be outside of glBegin/End */ glGetFloatv(GL_CURRENT_COLOR, color); /* 'shade' defines strength of shading */ coltop[0]= color[0]+shadetop; if(coltop[0]>1.0) coltop[0]= 1.0; coltop[1]= color[1]+shadetop; if(coltop[1]>1.0) coltop[1]= 1.0; coltop[2]= color[2]+shadetop; if(coltop[2]>1.0) coltop[2]= 1.0; coldown[0]= color[0]+shadedown; if(coldown[0]<0.0) coldown[0]= 0.0; coldown[1]= color[1]+shadedown; if(coldown[1]<0.0) coldown[1]= 0.0; coldown[2]= color[2]+shadedown; if(coldown[2]<0.0) coldown[2]= 0.0; glShadeModel(GL_SMOOTH); glBegin(mode); /* start with corner right-bottom */ if(roundboxtype & 4) { round_box_shade_col(coltop, coldown, 0.0); glVertex2f(maxx-rad, miny); for(a=0; a<7; a++) { round_box_shade_col(coltop, coldown, vec[a][1]/div); glVertex2f(maxx-rad+vec[a][0], miny+vec[a][1]); } round_box_shade_col(coltop, coldown, rad/div); glVertex2f(maxx, miny+rad); } else { round_box_shade_col(coltop, coldown, 0.0); glVertex2f(maxx, miny); } /* corner right-top */ if(roundboxtype & 2) { round_box_shade_col(coltop, coldown, (div-rad)/div); glVertex2f(maxx, maxy-rad); for(a=0; a<7; a++) { round_box_shade_col(coltop, coldown, (div-rad+vec[a][1])/div); glVertex2f(maxx-vec[a][1], maxy-rad+vec[a][0]); } round_box_shade_col(coltop, coldown, 1.0); glVertex2f(maxx-rad, maxy); } else { round_box_shade_col(coltop, coldown, 1.0); glVertex2f(maxx, maxy); } /* corner left-top */ if(roundboxtype & 1) { round_box_shade_col(coltop, coldown, 1.0); glVertex2f(minx+rad, maxy); for(a=0; a<7; a++) { round_box_shade_col(coltop, coldown, (div-vec[a][1])/div); glVertex2f(minx+rad-vec[a][0], maxy-vec[a][1]); } round_box_shade_col(coltop, coldown, (div-rad)/div); glVertex2f(minx, maxy-rad); } else { round_box_shade_col(coltop, coldown, 1.0); glVertex2f(minx, maxy); } /* corner left-bottom */ if(roundboxtype & 8) { round_box_shade_col(coltop, coldown, rad/div); glVertex2f(minx, miny+rad); for(a=0; a<7; a++) { round_box_shade_col(coltop, coldown, (rad-vec[a][1])/div); glVertex2f(minx+vec[a][1], miny+rad-vec[a][0]); } round_box_shade_col(coltop, coldown, 0.0); glVertex2f(minx+rad, miny); } else { round_box_shade_col(coltop, coldown, 0.0); glVertex2f(minx, miny); } glEnd(); glShadeModel(GL_FLAT); } static void setType(int nType){ roundboxtype = nType % 16; } protected: static void round_box_shade_col(float *col1, float *col2, float fac) { float col[3]; col[0]= (fac*col1[0] + (1.0-fac)*col2[0]); col[1]= (fac*col1[1] + (1.0-fac)*col2[1]); col[2]= (fac*col1[2] + (1.0-fac)*col2[2]); glColor3fv(col); } static int roundboxtype; }; int RoundBoxRender::roundboxtype = 3; #endif 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/dizuo/archive/2010/07/08/5721751.aspx