Function glDrawPointsTransform

src/engineWebGL.js:604–618

Transform and add a polygon to the gl draw list * @param {Array } points - Array of Vector2 points * @param {number} rgba - Color of the polygon as a 32-bit integer * @param {number} x * @param {number} y * @param {number} sx * @param {number} sy * @param {number} angle * @pa

(points, rgba, x, y, sx, sy, angle, tristrip=true)

 *  @param {boolean} [tristrip] - should tristrip algorithm be used
 *  @memberof WebGL */
function glDrawPointsTransform(points, rgba, x, y, sx, sy, angle, tristrip=true)
{
    const pointsOut = [];
    const sa = sin(-angle);
    const ca = cos(-angle);
    for (const p of points)
    {
        // transform the point
        const px = p.x*sx;
        const py = p.y*sy;
        pointsOut.push(vec2(x + ca*px - sa*py, y + sa*px + ca*py));
    }
    const drawPoints = tristrip ? glPolyStrip(pointsOut) : pointsOut;
    glDrawPoints(drawPoints, rgba);
}

/** Transform and add a polygon to the gl draw list
 *  @param {Array<Vector2>} points - Array of Vector2 points