import { calculateMirrorPoint } from 'jl-graphic';

/**
 *
 * @param polygon
 * @param x 箭头顶点x坐标
 * @param y 箭头顶点y坐标
 * @param length 箭头长度
 * @param radius 箭头三角半径
 * @param lineWidth 箭头线宽
 * @param mirror 是否镜像翻转 (基于箭头顶点)
 */
function drawArrow(polygon, x, y, length, radius, lineWidth, mirror) {
    const trianglAcme = { x, y };
    let triangleP1 = {
        x: x - radius - Math.sin(Math.PI / 6),
        y: y + Math.cos(Math.PI / 6) * radius,
    };
    let triangleP2 = {
        x: x - radius - Math.sin(Math.PI / 6),
        y: y - Math.cos(Math.PI / 6) * radius,
    };
    let lineP1 = {
        x: x - radius - Math.sin(Math.PI / 6),
        y: y + lineWidth / 2,
    };
    let lineP2 = {
        x: x - length,
        y: y + lineWidth / 2,
    };
    let lineP3 = {
        x: x - length,
        y: y - lineWidth / 2,
    };
    let lineP4 = {
        x: x - radius - Math.sin(Math.PI / 6),
        y: y - lineWidth / 2,
    };
    if (mirror) {
        triangleP1 = calculateMirrorPoint(trianglAcme, triangleP1);
        triangleP2 = calculateMirrorPoint(trianglAcme, triangleP2);
        lineP1 = calculateMirrorPoint(trianglAcme, lineP1);
        lineP2 = calculateMirrorPoint(trianglAcme, lineP2);
        lineP3 = calculateMirrorPoint(trianglAcme, lineP3);
        lineP4 = calculateMirrorPoint(trianglAcme, lineP4);
    }
    polygon.drawPolygon(trianglAcme.x, trianglAcme.y, triangleP1.x, triangleP1.y, lineP1.x, lineP1.y, lineP2.x, lineP2.y, lineP3.x, lineP3.y, lineP4.x, lineP4.y, triangleP2.x, triangleP2.y);
}

export { drawArrow };