cardioid curve meaning in English

心形曲线

For the cardioid curve , a fast pixel - level drawing algorithm is presented
摘要给出了快速绘制心脏线的逐点算法。
On each step of iteration , no trigonometric function is used , and only four multiplications for cardioid curve are required
迭代过程中避免了三角函数的运算，每步仅需4次（心脏线）乘法运算。
By taking advantage of the characteristic of the curves ' expression , the algorithm changes the cardioid curve into the linearly combination of some simple iterations
基于曲线表达式的特点，该算法将心脏线的点坐标迭代关系转化为几个简单的迭代关系的线性组合。