ベクトルの表示のアルゴリズムです。

http://hirohirosystem.com/003_cargame/zahyoV101.html

 

 

function vectordraw(){

    //ｘ座標

    zahyoget();

    linewidth = 2;

    lx = Math.ceil(wz*Math.cos(r1));

    ly = Math.ceil(wz*Math.sin(r1));

    linestartx = wx + lx;

    linestarty = 600 - wy - ly;

    lineendx = linestartx + 2;

    lineendy = linestarty - 2;

    wpx1 = linestartx;

    wpy1 = linestarty;

    wkcolor = 7;

    shapetype = "23";

    zahyodraw();

    lx = Math.ceil(wz1*Math.cos(r1));

    ly = Math.ceil(wz1*Math.sin(r1));

    lineendx = linestartx + wx1 +lx;

    lineendy = linestarty - wy1 -ly;

    wpx2 = lineendx;

    wpy2 = lineendy;

    wkcolor = 4;

    shapetype = "23";

    zahyodraw();

    lx = Math.ceil(wz2*Math.cos(r1));

    ly = Math.ceil(wz2*Math.sin(r1));

    lineendx = linestartx + wx2 +lx;

    lineendy = linestarty - wy2 -ly;

    wpx3 = lineendx;

    wpy3 = lineendy;

    wkcolor = 0;

    shapetype = "23";

    zahyodraw();

    lx = Math.ceil(wz3*Math.cos(r1));

    ly = Math.ceil(wz3*Math.sin(r1));

    lineendx = linestartx + wx3 +lx;

    lineendy = linestarty - wy3 -ly;

    wpx4 = lineendx;

    wpy4 = lineendy;

    wkcolor = 5;

    shapetype = "23";

    zahyodraw();

}