QEasingCurve的绘制

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#include < vector > 
#include < GL / glut.h > 
#include < cmath >
#include < gl / glaux.h > 
#include "QEasingCurve.h"
using namespace std;
GLfloat g_fAngle[3] = {
  0.0
};
int g_iAreaSizeX = 64;
int g_iAreaSizeY = 64;
class Painter {
  public: Painter(): mPreX(0), mPreY(0), mBegin(0) {}
  void drawLine(qreal bgX, qreal bgY, qreal edX, qreal edY) {
    glPushMatrix(); {
      glBegin(GL_LINES);
      glVertex3f(bgX, bgY, 0);
      glVertex3f(edX, edY, 0);
      glEnd();
    }
    glPopMatrix();
  }
  void moveTo(qreal x, qreal y) {
    mBegin = true;
    mPreX = x;
    mPreY = y;
  }
  void lineTo(qreal x, qreal y) {
    if (!mBegin) return;
    drawLine(mPreX, mPreY, x, y);
    mPreX = x;
    mPreY = y;
  }
  private: bool mBegin;
  qreal mPreX;
  qreal mPreY;
};
struct CurveControl {
  enum {
    Range = 41
  };
  CurveControl() {
    mCurveType = 0;
    mCurve = new QEasingCurve((QEasingCurve::Type) mCurveType);
  }
  void setRegion(int l, int b, int w, int h) {
    mLeft = l;
    mBottom = b;
    mWidth = w;
    mHeight = h;
  }
  void renderCurve() {
      glColor3f(0.5 f, 0.5 f, 0.5 f);
      glRectd(mLeft, mBottom, mLeft + mWidth, mBottom + mHeight);
      glLineWidth(3.0 f);
      glColor3f(1.0 f, 1.0 f, 0.0 f);
      Painter painter; //qreal xAxis = mHeight/1.5;//qreal yAxis = mWidth/3;
      qreal xAxis = mBottom;
      qreal yAxis = mLeft;
      painter.drawLine(mLeft, xAxis, mLeft + mWidth, xAxis);
      painter.drawLine(yAxis, mBottom, yAxis, mBottom + mHeight);
      qreal curveScale = mHeight * 0.8;
      painter.moveTo(yAxis, xAxis - curveScale * mCurve - > valueForProgress(0));
      for (qreal t = 0; t <= 1.0; t += 1.0 / curveScale) {
        painter.lineTo(yAxis + curveScale * t, xAxis + curveScale * mCurve - > valueForProgress(t));
      }
    }
    //MAX: QEasingCurve::NCurveTypes - 1
    //MIN: 0

  void decreTypeIdx() {
    mCurveType = (mCurveType - 1 + Range) % Range;
    update();
  }
  void increTypeIdx() {
    mCurveType = (mCurveType + 1) % Range;
    update();
  }
  void update() {
    mCurve - > setType((QEasingCurve::Type) mCurveType);
  }
  qreal mLeft;
  qreal mBottom;
  qreal mWidth;
  qreal mHeight;
  int mCurveType;
  QEasingCurve * mCurve;
};
CurveControl g_CurveControl;
void init();
void display();
void keyboard(unsigned char key, int x, int y);
void reshape(int w, int h);
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);
  glutMainLoop();
  return 0;
}
void init(void) {
  glClearColor(0.0, 0.0, 0.0, 0.0);
  glShadeModel(GL_FLAT);
  g_CurveControl.setRegion(0, 0, g_iAreaSizeX, g_iAreaSizeY);
}
void display(void) {
  glClear(GL_COLOR_BUFFER_BIT);
  glLoadIdentity(); /* clear the matrix */ /* viewing transformation */
  gluLookAt(0.0, 0.0, 120.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
  glRotatef(g_fAngle[0], 0.0, 1.0, 0.0);
  glRotatef(g_fAngle[1], 1.0, .0, 0.0);
  glRotatef(g_fAngle[2], 0.0, .0, 1.0);

  //Render Scene~
  //Painter painter;
  //painter.drawLine(0, 0, 64, 64);
  //glutSolidCube(1.0f);
  CurveControl leftTopRegion;
  leftTopRegion.setRegion(-g_iAreaSizeX, 0, g_iAreaSizeX, g_iAreaSizeY);
  leftTopRegion.increTypeIdx();
  leftTopRegion.renderCurve();
  CurveControl leftBottomRegion;
  leftBottomRegion.setRegion(-g_iAreaSizeX, -g_iAreaSizeY, g_iAreaSizeX, g_iAreaSizeY);
  leftBottomRegion.increTypeIdx();
  leftBottomRegion.increTypeIdx();
  leftBottomRegion.renderCurve();
  CurveControl rightBottomRegion;
  rightBottomRegion.setRegion(0, -g_iAreaSizeY, g_iAreaSizeX, g_iAreaSizeY);
  rightBottomRegion.increTypeIdx();
  rightBottomRegion.increTypeIdx();
  rightBottomRegion.increTypeIdx();
  rightBottomRegion.renderCurve();
  g_CurveControl.renderCurve();
  glutSwapBuffers();
}
void reshape(int w, int h) {
  glViewport(0, 0, (GLsizei) w, (GLsizei) h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  //glFrustum (-1.0, 1.0, -1.0, 1.0, 1.5, 20.0);
  gluPerspective(60, 1.0, 1.5, 500);
  //gluOrtho2D( 0, w, 0, h );
  glMatrixMode(GL_MODELVIEW);
}
void keyboard(unsigned char key, int x, int y) {
  switch (key) {
  case 27:
    exit(0);
    break;
  case 'i':
    g_CurveControl.increTypeIdx();
    printf("%d/n", g_CurveControl.mCurveType);
    break;
  case 'd':
    g_CurveControl.decreTypeIdx();
    printf("%d/n", g_CurveControl.mCurveType);
    break;
  }
  glutPostRedisplay();
}