import { Vec2 } from "./common.js";
function drawTriangle(gfx, positions, color) {
    const a_position = gfx.getAttribute("a_position");
    const a_color = gfx.getAttribute("a_color");
    const points = [
        positions[0].x, positions[0].y,
        positions[1].x, positions[1].y,
        positions[2].x, positions[2].y,
    ];
    const colors = [
        color,
        color,
        color,
    ];
    a_position.data(gfx.ctx, points, gfx.ctx.STATIC_DRAW);
    a_color.data(gfx.ctx, colors.flat(), gfx.ctx.STATIC_DRAW);
    gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 3);
}
function drawTriangleExts(gfx, position, exts, color) {
    const a_position = gfx.getAttribute("a_position");
    const a_color = gfx.getAttribute("a_color");
    const points = [
        position.x, position.y,
        position.x + exts.x, position.y,
        position.x, position.y + exts.y,
    ];
    const colors = [
        color,
        color,
        color,
    ];
    a_position.data(gfx.ctx, points, gfx.ctx.STATIC_DRAW);
    a_color.data(gfx.ctx, colors.flat(), gfx.ctx.STATIC_DRAW);
    gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 3);
}
function drawRectangle(gfx, position, exts, color) {
    const a_position = gfx.getAttribute("a_position");
    const a_color = gfx.getAttribute("a_color");
    const points = [
        position.x, position.y,
        position.x + exts.x, position.y,
        position.x, position.y + exts.y,
        position.x + exts.x, position.y + exts.y,
        position.x + exts.x, position.y,
        position.x, position.y + exts.y,
    ];
    const colors = [
        color,
        color,
        color,
        color,
        color,
        color,
    ];
    a_position.data(gfx.ctx, points, gfx.ctx.STATIC_DRAW);
    a_color.data(gfx.ctx, colors.flat(), gfx.ctx.STATIC_DRAW);
    gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 6);
}
function drawCircle(gfx, position, radius, color) {
    const points = new Array();
    const precision = 40;
    const angle = 2.0 * Math.PI / precision;
    let a = 0;
    for (let i = 0; i < precision; ++i) {
        var vec = Vec2.angle(a);
        vec.mult(radius);
        a += angle;
        points.push(vec);
    }
    for (let i = 0; i < points.length; i++) {
        const current = points[i];
        const next = points[(i + 1) % points.length];
        let center = position;
        drawTriangle(gfx, [center, center.addNew(current), center.addNew(next)], color);
    }
}
function drawLine(gfx, A, B, color) {
    const a_position = gfx.getAttribute("a_position");
    const a_color = gfx.getAttribute("a_color");
    let points = [
        A.x, A.y,
        B.x, B.y,
    ];
    const colors = [
        color,
        color,
    ];
    a_position.data(gfx.ctx, points, gfx.ctx.STATIC_DRAW);
    a_color.data(gfx.ctx, colors.flat(), gfx.ctx.STATIC_DRAW);
    gfx.ctx.drawArrays(gfx.ctx.LINES, 0, 2);
}
export { drawTriangle, drawTriangleExts, drawRectangle, drawCircle, drawLine };