Function processArc

libs/echarts/echarts.simple.js:15196–15246

(x1, y1, x2, y2, fa, fs, rx, ry, psiDeg, cmd, path)

};

function processArc(x1, y1, x2, y2, fa, fs, rx, ry, psiDeg, cmd, path) {
    var psi = psiDeg * (PI / 180.0);
    var xp = mathCos(psi) * (x1 - x2) / 2.0
                + mathSin(psi) * (y1 - y2) / 2.0;
    var yp = -1 * mathSin(psi) * (x1 - x2) / 2.0
                + mathCos(psi) * (y1 - y2) / 2.0;

    var lambda = (xp * xp) / (rx * rx) + (yp * yp) / (ry * ry);

    if (lambda > 1) {
        rx *= mathSqrt(lambda);
        ry *= mathSqrt(lambda);
    }

    var f = (fa === fs ? -1 : 1)
        * mathSqrt((((rx * rx) * (ry * ry))
                - ((rx * rx) * (yp * yp))
                - ((ry * ry) * (xp * xp))) / ((rx * rx) * (yp * yp)
                + (ry * ry) * (xp * xp))
            ) || 0;

    var cxp = f * rx * yp / ry;
    var cyp = f * -ry * xp / rx;

    var cx = (x1 + x2) / 2.0
                + mathCos(psi) * cxp
                - mathSin(psi) * cyp;
    var cy = (y1 + y2) / 2.0
            + mathSin(psi) * cxp
            + mathCos(psi) * cyp;

    var theta = vAngle([ 1, 0 ], [ (xp - cxp) / rx, (yp - cyp) / ry ]);
    var u = [ (xp - cxp) / rx, (yp - cyp) / ry ];
    var v = [ (-1 * xp - cxp) / rx, (-1 * yp - cyp) / ry ];
    var dTheta = vAngle(u, v);

    if (vRatio(u, v) <= -1) {
        dTheta = PI;
    }
    if (vRatio(u, v) >= 1) {
        dTheta = 0;
    }
    if (fs === 0 && dTheta > 0) {
        dTheta = dTheta - 2 * PI;
    }
    if (fs === 1 && dTheta < 0) {
        dTheta = dTheta + 2 * PI;
    }

    path.addData(cmd, cx, cy, rx, ry, theta, dTheta, psi, fs);
}


var commandReg = /([mlvhzcqtsa])([^mlvhzcqtsa]*)/ig;