protected SceneComponent(Geom.Point3d pos)
{
_pos = pos;
_obj = HiGL.CreateDisplayList(() => this.Render());
}
public void Draw(ISceneContext context)
{
_size = context.Camera.ScreenSize;
using (var whole = context.Push()) {
whole.Color = Color.Gray;
whole.PointSize = 3;
whole.LineWidth = 1;
// X, Y 軸（直線）の描画
context.DrawLines(gl =>
{
gl.Vertex(0, _pos.y);
gl.Vertex(_size.x, _pos.y);
gl.Vertex(_pos.x, 0);
gl.Vertex(_pos.x, _size.y);
});
// 目盛の間隔
const int P0 = 16; // 目盛の最小ピクセル数
double unit = context.Camera.LengthPerPixel;
double exp = Math.Log10(P0 * unit);
double delta = Math.Pow(10, Math.Ceiling(exp));
if (delta / unit > 5 * P0)
{
delta /= 2;
}
Geom.Box2d box = new Geom.Box2d(
new Geom.Point2d(-_pos.x * unit, (_pos.y - _size.y) * unit),
new Geom.Point2d((_size.x - _pos.x) * unit, _pos.y * unit)
);
// 目盛を点列として描画
using (var gl = HiGL.Begin(GLPrimType.Points)) {
for (double x = 0.0; x < box.Upper.x; x += delta)
{
gl.Vertex(_pos.x + (int)(x / unit), _pos.y);
}
for (double x = 0.0; x > box.Lower.x; x -= delta)
{
gl.Vertex(_pos.x + (int)(x / unit), _pos.y);
}
for (double y = 0.0; y < box.Upper.y; y += delta)
{
gl.Vertex(_pos.x, _pos.y - (int)(y / unit));
}
for (double y = 0.0; y > box.Lower.y; y -= delta)
{
gl.Vertex(_pos.x, _pos.y - (int)(y / unit));
}
}
// 目盛の数値を描画
for (double x = 2 * delta; x < box.Upper.x; x += 2 * delta)
{
DrawNumber(context, _pos.x + (int)(x / unit), _pos.y + 16, x);
}
for (double x = -2 * delta; x > box.Lower.x; x -= 2 * delta)
{
DrawNumber(context, _pos.x + (int)(x / unit), _pos.y + 16, x);
}
for (double y = 2 * delta; y < box.Upper.y; y += 2 * delta)
{
DrawNumber(context, _pos.x + 2, _pos.y - (int)(y / unit), y);
}
for (double y = -2 * delta; y > box.Lower.y; y -= 2 * delta)
{
DrawNumber(context, _pos.x + 2, _pos.y - (int)(y / unit), y);
}
// 分度器の描画
double radius = 100;
using (var gl = HiGL.Begin(GLPrimType.LineStrip)) {
for (int deg = 0; deg <= 90; deg += 5)
{
double rad = Math.PI * deg / 180.0;
double x = _pos.x + radius * Math.Cos(rad);
double y = _pos.y - radius * Math.Sin(rad);
gl.Vertex(x, y);
}
}
using (var gl = HiGL.Begin(GLPrimType.Points)) {
for (int deg = 15; deg < 90; deg += 15)
{
double rad = Math.PI * deg / 180.0;
double x = _pos.x + radius * Math.Cos(rad);
double y = _pos.y - radius * Math.Sin(rad);
gl.Vertex(x, y);
}
}
}
}
