用C ++中的Theta Degrees旋转笛卡尔平面上的X，Y坐标

Question

在我的代码中，我创建了一个点的二维散点图：

//Loop through all 13 objects
for (int playerEntity = 0; playerEntity < 13; playerEntity++) {

    //Obtain X and Y Value Offset from Scatter Plot's origin for each object
    int px = positionX[playerEntity] / 20;
    int py = positionY[playerEntity] / 20;

    //Establish X and Y origin in terms of the screen's pixels;
    int originX = 500;
    int originY = 1000;

    //Plot the scatter plot point in respect to the origin
    FillRGB(originX  + px , originY  + py);

}

如何围绕图形原点旋转点px和py一定程度？例如，如果我想围绕原点旋转图形的点px和py 48度，我该怎么办？有什么想法吗？