//圆的生成算法，没有浮点运算，效率较快，至今仍使用
#define PI 3.1415926
float C_ScreenTest::angle(float x1, float y1, float x2, float y2) //计算两点之间的弧度
{
float angle_temp;
float xx, yy;
xx = x2 - x1;
yy = y2 - y1;
if (xx == 0.0)
angle_temp = PI / 2.0;
else
angle_temp = atan(fabs(yy / xx));
if ((xx < 0.0) && (yy >= 0.0))
angle_temp = PI - angle_temp;
else if ((xx < 0.0) && (yy < 0.0))
angle_temp = PI + angle_temp;
else if ((xx >= 0.0) && (yy < 0.0))
angle_temp = PI * 2.0 - angle_temp;
return (angle_temp);
}
float C_ScreenTest::getAngle(float x0, float y0,float x1, float y1, float x2, float y2)
{
OSI_Debug(DLEVEL_INFO, "=======================: %f", angle(x0,y0,x1,y1));
OSI_Debug(DLEVEL_INFO, "+++++++++++++++++++++++: %f", angle(x0,y0,x2,y2));
return(abs(angle(x0,y0,x2,y2)-angle(x0,y0,x1,y1)));
}
// 圆 反走样算法
#define LERP(h,l,a) ((l)+(((h)-(l))*(a)))
#define ABS(v) ( v>0 ? v: -v )
ColorInfo C_ScreenTest::getpixel_circle(int x, int y)
{
ColorInfo circle_color;
circle_color.nColorR = m_logoBufSingleColor[3 * x * m_width + y * 3 + 0];
circle_color.nColorG = m_logoBufSingleColor[3 * x * m_width + y * 3 + 1];
circle_color.nColorB = m_logoBufSingleColor[3 * x * m_width + y * 3 + 2];
return circle_color;
}
bool flag_key = false; //控制画圆还是画圆弧
int circle_x = 100; //圆心坐标
int circle_y = 50; //圆心坐标
