VectorUtils.java 文件源码

/**
 * Convert 3D coord into 2D coordinate projected onto the screen
 */
public static Plane toScreen(double x, double y, double z) {
    Entity view = MC.getRenderViewEntity();

    if(view == null) return new Plane(0.D, 0.D, false);

    Vec3d camPos = FastReflection.Fields.ActiveRenderInfo_position.getStatic();
    Vec3d eyePos = ActiveRenderInfo.projectViewFromEntity(view, MC.getRenderPartialTicks());

    float vecX = (float) ((camPos.x + eyePos.x) - (float)x);
    float vecY = (float) ((camPos.y + eyePos.y) - (float)y);
    float vecZ = (float) ((camPos.z + eyePos.z) - (float)z);

    Vector4f pos = new Vector4f(vecX, vecY, vecZ, 1.f);

    modelMatrix.load(FastReflection.Fields.ActiveRenderInfo_MODELVIEW.getStatic().asReadOnlyBuffer());
    projectionMatrix.load(FastReflection.Fields.ActiveRenderInfo_PROJECTION.getStatic().asReadOnlyBuffer());

    VecTransformCoordinate(pos, modelMatrix);
    VecTransformCoordinate(pos, projectionMatrix);

    if (pos.w > 0.f) {
        pos.x *= -100000;
        pos.y *= -100000;
    } else {
        float invert = 1.f / pos.w;
        pos.x *= invert;
        pos.y *= invert;
    }

    ScaledResolution res = new ScaledResolution(MC);
    float halfWidth = (float)res.getScaledWidth() / 2.f;
    float halfHeight = (float)res.getScaledHeight() / 2.f;

    pos.x = halfWidth + (0.5f * pos.x * res.getScaledWidth() + 0.5f);
    pos.y = halfHeight - (0.5f * pos.y * res.getScaledHeight() + 0.5f);

    boolean bVisible = true;

    if(pos.x < 0 || pos.y < 0 || pos.x > res.getScaledWidth() || pos.y > res.getScaledHeight())
        bVisible = false;

    return new Plane(pos.x, pos.y, bVisible);
}